lg mcd112 aou
TRANSCRIPT
MINI Hi-Fi SYSTEMSERVICE MANUAL
MODEL : MCD112 (MCS112F)
CAUTIONBEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”IN THIS MANUAL.
Website http://biz.lgservice.com
MO
DE
L: M
CD
112 (MC
S112F
)S
ER
VIC
E M
AN
UA
L
Internal Use Only
P/NO : AFN72956656 APRIL, 2009
1-1Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
CONTENTS
SECTION 1GENERALSERVICING PRECAUTIONS ................................1-2
• NOTES REGARDING HANDLINGOF THE PICK-UP
• NOTES REGARDING COMPACT DISCPLAYER REPAIRS
ESD PRECAUTIONS ............................................1-4
LOCATION OF USERS CONTROLS....................1-5
SPECIFICATIONS .................................................1-7
SECTION 2EXPLODED VIEWSCABINET EXPLODED VIEW................................2-1
TAPE DECK MECHANISM EXPLODED VIEW ....2-31. TAPE DECK MECHANISM
(A/S & A/S : RIGHT A/S DECK) ..................2-32. TAPE DECK MECHANISM
(A/S & A/S : LEFT A/S DECK) ....................2-5
CD MECHANISM EXPLODED VIEW ...................2-7
SPEAKER EXPLODED VIEW ..............................2-9MODEL : MCS112F.........................................2-9
PACKING ACCESSORY VIEW...........................2-13
SECTION 3AUDIO PART ELECTRICALAUDIO ELECTRICALTROUBLESHOOTING GUIDE ..............................3-1
1. POWER (SMPS) .........................................3-12. P-SENS .......................................................3-23. VKK CHECK................................................3-24. MICOM PART CHECK I ..............................3-25. MICOM PART CHECK II .............................3-36. IC103(KS4CD21CS) CHECK......................3-47. FLD DISPLAY CHECK ................................3-58. PWM MODULATION PART CHECK...........3-69. POWER AMP PART CHECK ......................3-7
10. AUX FUNCTION CHECK ............................3-811. TUNER FUNCTION CHECK .......................3-912. TAPE FUNCTION CHECK ........................3-1013. TAPE PLAY PART CHECK ........................3-1114. TAPE REC PART CHECK .........................3-12
INTERNAL BLOCK DIAGRAM OF ICs ..............3-131. ES6838.......................................................3-132. HA12237F. ..................................................3-14
3. PS9829B ....................................................3-154. PT6324 .......................................................3-155. STR-S6757IF1905......................................3-166. TAS5142 .....................................................3-177. U1739EJ2V1UD00/KF2_E .........................3-18
WIRING DIAGRAM .............................................3-19
BLOCK DIAGRAMS ...........................................3-211. SMPS BLOCK DIAGRAM .........................3-212. MAIN & FRONT BLOCK DIAGRAM .........3-23
SCHEMATIC DIAGRAMS ...................................3-251. SMPS SCHEMATIC DIAGRAM ................3-252. MAIN SCHEMATIC DIAGRAM..................3-273. AMP SCHEMATIC DIAGRAM ...................3-294. DECK SCHEMATIC DIAGRAM.................3-315. FRONT SCHEMATIC DIAGRAM.................3-336. KEY-L SCHEMATIC DIAGRAM ...................3-357. KEY-R SCHEMATIC DIAGRAM...................3-36
PRINTED CIRCUIT BOARD DIAGRAMS...........3-371. MAIN P.C.BOARD .....................................3-372. FRONT P.C.BOARD..................................3-413. SMPS P.C.BOARD....................................3-434. KEY-L P.C.BOARD ....................................3-445. KEY-R P.C.BOARD ...................................3-44
SECTION 4 CD PART ELECTRICALCD ELECTRICALTROUBLESHOOTING GUIDE ..............................4-1
1. CD PART TROUBLESHOOTING................4-12. USB PART TROUBLESHOOTING..............4-9
WAVEFORMS OF MAJOR CHECK POINT .......4-10
SCHEMATIC DIAGRAMS ...................................4-131. CD SCHEMATIC DIAGRAM .....................4-132. USB SCHEMATIC DIAGRAM ...................4-15
PRINTED CIRCUIT BOARD DIAGRAM .............4-17CD P.C.BOARD .............................................4-17
SECTION 5 REPLACEMENTPARTS LIST............................................5-1
1-2 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
NOTES REGARDING HANDLING OF THE PICK-UP1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/ordamage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reasonthe adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!Absolutely never permit laser beams to enter the eyes!Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
5) Cleaning the lens surfaceIf there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as usedfor camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cottonswab should be used, taking care not to distort this.
6) Never attempt to disassemble the pick-up.Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do notuse any other liquid cleaners, because they will damage the lens.) Take care not to use too much of thisalcohol on the swab, and do not allow the alcohol to get inside the pick-up.
SERVICING PRECAUTIONS
SECTION 1 GENERAL
1-3Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
NOTES REGARDING COMPACT DISC PLAYER REPAIRS1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These componentsare sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, componentscan be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must betaken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong mag-netism is present, or where there is excessive dust.
2. Notes for repair1) Before replacing a component part, first disconnect the power supply lead wire from the unit2) All equipment, measuring instruments and tools must be grounded.3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This isbecause there is the possibility of damage by static electricity.)
4) To prevent AC leakage, the metal part of the soldering iron should be grounded.5) Workers should be grounded by an armband (1MΩ)6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static electricity changes in the clothing to escape from the armband.7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
CLEARING MALFUNCTIONYou can reset your unit to initial status if malfunction occur(button malfunction, display, etc.).Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside ofthe volume knob for more than 3 seconds.If you reset your unit, you must reenter all its settings(stations, clock, timer)
NOTE: 1. To operate the RESET jump wire, pull the volume rotary knob and release it.2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.
1-4 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)Some semiconductor (solid state) devices can be damaged easily by static electricity. Such componentscommonly are called electrostatically sensitive devices (ESD). Examples of typical ESD devices are inte-grated circuits and some field-effect transistors and semiconductor chip components. The following tech-niques should be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drainoff any electrostatic charge on your body by touching a know earth ground. Alternatively, obtain andwear a commercially available discharging wrist strap device, which should be removed for potentialshock reasons prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductivesurface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static"can generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals These can generate electrical charges sufficient to damage ESDdevices.
6. Do not remove a replacement ESD device from its protective package until immediately before you areready to install it. (Most replacement ESD devices are packaged with leads electrically shorted togetherby conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touchthe protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALLOTHER SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmlessmotion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floorcan generate static electricity sufficient to damage an ESD device).
[CAUTION. GRAPHIC SYMBOLS]
THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL. WITHIN AN EQUILATERALTRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCEOF UNINSULATED "DANGEROUS VOLTAGE" THAT MAY BE OF SUFFICIENT MAGNI-TUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENED TOALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETYINFORMATION IN SERVICE LITERATURE.
1-5Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
LOCATION OF USERS CONTROLS
FRONT PANEL
1
2
3
4
5
6
7
8
9
10
11
1. POWERYou can set up the unit into an economic powersave mode. In the power-on status, press and hold
(POWER) for about 3 seconds. To cancelpower save mode, press (POWER).
2. ST./MONOPress ST./MONO. This will change the tuner fromstereo to mono and usually improve the reception.
3. MP3 OPT. (MP3 Optimizer)This function is optimized for compressible MP3files so that it improves the bass sound.
4. DEMOPress DEMO in power off state to demonstrate thefunction on display window. To cancel it, press or DEMO again.
5. Headphone jackConnect a headphone plug (ø3.5 mm) into the jackto listen to the sound through headphones (notsupplied).
6. CD tray
7. XTS - PROThe function creates the optimum sound for you toplay of the original sound. Each time you pressXTS - PRO, “XTS -- PRO ON” or “XTS -- PROOFF” is displayed in turn. (The XTS Pro functionwill not be operated when a headphone has beenconnected.)
8. D.SKIPIf more than one portable USB player is connectedto the system at the same time, press D.SKIP toselect one of them.
9. AUXYou can connect many other types of audio oraudio visual device to the system via the auxiliarysockets (AUX IN) on the back of the player.
10.VOLUMEControl the volume when using any function.
11.USB connector - OPTIONALConnect a remote USB compatible player here.
1-6 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
REMOTE CONTROL
10
12
13
14
9
8
2
3
4
5
6
7
1
11
1. Search for a folder of MP3/WMA files When a CD containing MP3/WMA files in severalfolders is being played, press PRESET/FOLDER toselect the folder you want to play.
2. Fall asleep while listening to your playerFirstly, start a radio station or music. Press SLEEPon the remote one or more times to select a delayof between 10 and 180 minutes, after which theplayer will turn off.
3. Use when playing a CD
4. Listen to your tracks again and againPress REPEAT once to repeat the track currentlyplaying. Press REPEAT twice to repeat the wholeCD, or if you’re listening to the whole folder ofMP3/WMA CD . The display will show what is beingrepeated.
5. Use when playing a cassette tape
6. Sound quality adjustmentYou can select a desired sound mode by using EQ.
7. Play any track on a CDPress the corresponding number buttons on theremote control.
8. Temporarily stop the soundPress the button again to return to the sound.
9. To change the functionsChange the functions between FM, AM, CD, AUX,USB or TAPE
10.Dimm the display light
11.For storing radio stationsIf you have saved radio stations using PROGRAM/MEMO, you can scroll through them and select one(see Listening to the radio).
12.eXtreme Dynamic Sound SystemReinforce the treble, bass and surround soundeffect. XDSS ON will show in the display. Pressagain for XDSS OFF.
13.RANDOMPress RANDOM, play tracks/files you can in a ran-dom order or cancel it.
14.See information about your musicMP3/WMA files often come with tags. The tag givesthe Title, Artist or Album. Press INFO while a file isplaying to see this information. If there are no tags,“NO ID3 TAG” or “NO WMA TAG” will show.
1-7Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
SPECIFICATIONS
• GENERALNet Weight 5.57kg (MCD212 Model)
5.36kg (MCD112 Model)External dimensions (WxHxD) 170 x 243 x 282mm
• TUNERFM Tuning Range 87.5 ~ 108.0MHz or 65 ~ 74MHz,
87.5 ~ 108.0MHzAM Tuning Range 522 ~ 1620kHz or 520 ~ 1720kHz
• AMPLIFIEROutput Power 100W + 100W (MCD212 Model)
50W + 50W (MCD112 Model)T.H.D 0.5%Frequency Response 40 ~ 20000HzSignal-to-noise ratio 75dB
• CDFrequency response 40 ~ 20000HzSignal-to-noise ratio 75dBDynamic range 75dB
• SPEAKERSMCS212F Type Bass Reflex 2 Way 2 Speaker
Impedance 4ΩRated Input Power 100WMax. Input Power 200WNet Dimensions (WxHxD) 220 x 342 x 270mmNet Weight (1EA) 3.46kg
MCS112F Type Bass Reflex 2 Way 2 SpeakerImpedance 4ΩRated Input Power 50WMax. Input Power 100WNet Dimensions (WxHxD) 200 x 337 x 228mmNet Weight (1EA) 2.92kg
1-8 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
MEMO
2-1 2-2
SECTION 2 EXPLODED VIEWSCABINET EXPLODED VIEW
255
256
E
F
G
IJ
H
A
B
B
M
N
A
JK
H
L
L
K
M
I
C
G
EF
D
A26
A41
A47
A46
266
263
305
451
267
289
456
450
264
458
450
450
450
290
290454
CABLE2
CABLE4
CN806
P9701
P9702
260
CD
MAIN
SMPS
291
257
255
259
253
253
254
450
N
N
C
450
450
A00
CABLE1
CABLE5
CN201
CABLE3
A43
A40
FRONT
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2-3 2-4
TAPE DECK MECHANISM EXPLODED VIEW1. TAPE DECK MECHANISM (A/S & A/S : RIGHT A/S DECK)
BRASS MOTOR PULLEY MAYBE CHANGEDFOR WOW FLUTTER WHEN NECESSARY
RING FW MAYBE ADDEDFOR WOW FLUTTER WHEN NECESSARY
001
002
006
007
008
016 017
018
019
020
003
A00
009
009
A02
A01
011
013
022
025
015
023
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2-5 2-6
2. TAPE DECK MECHANISM (A/S & A/S : LEFT A/S DECK)
RING FW MAYBE ADDEDFOR WOW FLUTTER WHEN NECESSARY
013
011009
009
003
008
015
022
023
024
016 017
018
019
020
007
A03
A00
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2-7 2-8
CD MECHANISM EXPLODED VIEW
416
151
159
165
164
417
166
417
167
416
177
175
172
170419
417
418 418190
189
188
A30
A32
A26
181
187
186
184
421
421
185
156
155
153
173
168
163
162
441
440
422
A35
417
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2-9 2-10
SPEAKER EXPLODED VIEWMODEL : MCS112F
850L850R
853 855
854
852
851
A80BA80LA80R
A80ALA80AR
856
WIRE80
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2-11 2-12 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
MEMOMEMO
2-13Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
PACKING ACCESSORY VIEW
2-14 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
MEMO
3-1Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
AUDIO ELECTRICAL TROUBLESHOOTING GUIDE
SECTION 3 AUDIO PART ELECTRICAL
1. POWER (SMPS)
POWER (SMPS)
OK
YES
YES
YES
Replace IC 901,902Check IC901, 902
Check the fuseF901
NONO
NO
YES
Check short ofP9701, P9702 line
Replace the fuse
Checkthe DC V of C905.
If DC V is over400V
NOCheck BD901, LF901, 902
Check theDC V of C981, C945.
If DC V is 6.1V
NOCheck short of P9702 line
YES
YES
Chcek theDC V of C950, C951
If DC V is in31.5V
NOCheck short of P9701 line
Chcek theDC V of C909, C903,
C921 If DC V is in 14~19Vand it is steady.
YES
3-2 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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2. P-SENS
P-SENS
YES
YES
Checkthe PIN6 of P9702
If DC V is over 5.6VCheck power circuit Trouble shooting
NO
OK
3. VKK CHECK
VKK check
YES
YES
Checkthe PIN3 of P9702
If DC V is over -28V ±2Check power circuit Trouble shooting
NO
OK
4. MICOM PART CHECK I
MICOM part check I
OK OK
YES
YES
Check P-SENS(P7904)_PIN6.
NO Refer toSMPS troubleshooting.
YES YESYES
Check bothend voltage of IC101
(KIA7042).
Checkif input voltage ofIC101(KIA7042) is
over 5V.
YES
NO Check theperiphery of IC101
(KIA7042).
NO
YES
Check if IC101(KIA7042) ofoutput voltage is over 4.3V.
Check voltage of IC10078KO/KF2_PIN1.
NO Replace IC101(KIA7042).
3-3Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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5. MICOM PART CHECK II
MICOM part check II
X101 : 32.768kHzX100 : 9.8304MHz
Check the operation.
CheckQ101_ emitter/collector
5V.Check Q102_base
0.6V HIGH.
Check if IC103_PIN8 and IC100_PIN19, 20, 59 are 5V.
NO NO
YES
YES
Check ifvoltage of P7904_PIN5
is 5.6V.
NO Refer toSMPS troubleshooting.
YES
YES
YES
OK
YES
Checkboth end voltage of
D101 YES
YES
Check D101.
NO Check if output ofD101(1SR35) is 5V.
YESYES
YES
YES
Check IC101.Q102_collector 0.6V LOW.
OK
Check if output of IC101(KIA7042) is over 4.3V.
OK
NOReplace IC101.
NOReplace D101.
YES
Check Q102.
OK
NOReplace Q102.
3-4 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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CheckIC100(78KOKF2)_
PIN 22, 24
OK
YES
YES
Refer tomicom troubleshooting
Check micomvoltage 5V.
PIN22DATA PIN24 CLK
NONO
YES
Replace micom.Check micom.NO
YES
OK
6. IC103(KS4CD21CS) CHECK
3-5Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
FLD display check
YES
YES
Replace P3702.Check eachPIN voltage.
NO
NO
YES
YES
OK
Replace IC301.Check IC301.NO
YES
Replace IC100FLD light on? Check IC100.NO
YES
YES
OK
Refer to SMPS
7. FLD DISPLAY CHECK
YES
YES
CheckP7904_PIN1, 2, 3 voltage
input.
NOCheck P3702 connection.
NO
If voltage is not 5V,check input and output
of D319(1SR35).
YES
Check P3702connection and power.
Pin1 : FL-22 Pin2 : FL+26Pin3 : VKK- over
26V.
YES
YES
YES
YES
OKOK
76 PIN - > DO - - >Check DATA in Check IC100.
NOIC100
75 PIN - > STB 77 PIN - > 4PIN DI
78 PIN - > 1PIN CLKCheck data output.
IC100 - >Check IC301
DATA communication.PIN PIN
75PIN - > 3PIN STB76PIN - > 2PIN D78PIN - > 1PIN
CLK
CheckIC301(PT6324) voltage.
Pin50 VKK : -26VPIN9.52 : +5V
Check if both end votageof F1, F2 are over 3.7V.
VKK : over 26V.
3-6 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
8. PWM MODULATION PART CHECK
PWM modulationpart check
YES
YES
YES
YES
P7905_PIN93.3V checking
Check IC604(PS9829)VDD PIN voltage(3, 7, 8,10, 22, 29, 39, 47, 56, 65,
72, 94).Check X601_PIN2 3.3V.
NO Refer toSMPS troubleshooting.
YES
YES
YES
YESCheck IC605_
PIN3 input and PIN2output.
CheckX601 12.288MHz
operation.
Check IC605_PIN8 3.3V.
Check IC605_PIN3 input
Check X6012.288MHz
NO
NO
IC604(PS9829) PIN86 CLK
input check
NO
Check FB614BEAD input, output and
voltage.
NO
Check X60112.288MHz.
Replace X601.
OK
NO
OK
YES
YES
NOReplace FB614
NO
Check IC605_PIN2 output
YES
OK
YES
OK
Replace IC605.NO
Check R680(470Ω) output.
Replace R680.NO
CheckIC604(PS9829) DATA
input.
Check each LINEregistor output.
NO
Check IC604(PS9829) DATA input.
78 PIN->DATA79 PIN->CLK
Check PWMmodulator output.
FL:75(+)74(-)FR:71(+)70(-)
NO
NO
CheckDVD ASS`Y(PS9829)
communication(P7403).
Refer toCD troubleshooting.
NO
CheckIC100(78KOKF2)21->PWM_CLK
22->PWM_DATA43->PWM_REST
output.
NO
YES
YES
OK
YES
OK
Check IC604(PS9829).OK
CheckLINE registor output.
DATA:R671, CLK:R670RST:R665
Replace R670, R671and R665
NO
NOReplace X601.
OK
YES
YES
YES
YES
3-7Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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Power AMP part check
YES
Check each LINE registor output voltage.IC700 : R701, 702, 726, 727
NOCheck each
IC700, 701, 702, 703PIN1,17, 18, 19, 36 +12V
input.
Refer to SMPS troubleshooting.
YES
YES
YES
NOP7905_3PIN : +12V,PIN13, 14, 15 : 35V.
YES
Replace the coils
YES
NOCheck output line coil.
Check PWM modulator input.Each IC PIN4, 6, 14, 16
YES
Power IC700, 701, 702, 703PIN20, 27, 29, 34 output.
Check each IC700, 701, 702, 703PIN21, 26, 29, 34 input voltage.
OK
9. POWER AMP PART CHECK
3-8 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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10. AUX FUNCTION CHECK
AUX function check
Check µ-COM(IC301)_PIN83, 84 commucation.
NO NO
YES
Replace IC200
YES
YES
YES
CheckIC200(BU4052)_
PIN4, 11 inputwaveform.
CheckIC200(BU4052)_PIN16
VDD, PIN8 VSSpower.
Refer toSMPS troubleshooting.
NO NO
YES
Replace IC801OK
YES
YES
CheckIC801(MC4580)_PIN 2, 6
input waveform.
CheckIC801(MC4580)_PIN4
VSS, PIN8 VDDpower.
Check IC200(BU4052)_PIN3, 13 output waveform.
Check JK800 connection.
3-9Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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11. TUNER FUNCTION CHECK
TUNER function check
YES
Check IC200(BU4052)_PIN16 VDD, PIN8 VSS power.
NOCheck
IC200(BU4052)_PIN3, 13output waveform and IC601
(BU4052)_PIN2,15 inputwaveform.
Check TUNER module voltage(PIN2 : 9V).
YES
YES
YES
YES
NOCheck TUNERmodule(TU601) operation.
YES
Check IC801(MC4580)_PIN4 VSS, PIN8 VDD power.
YES
NOCheck IC801(MC4580)_PIN2, 6 input waveform.
Replace IC200.Replace IC200.
Replace IC801.
Check IC200(BU4052)_PIN1, 12 inputwaveform.
OK
3-10 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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12. TAPE FUNCTION CHECK
TAPE function check
YES
Check IC200(BU4052)_PIN16 VDD, PIN8 VSS power
YES
YES
YES
NOCheckIC200(BU4052)_PIN2, 15 input
waveform.
Check IC200(BU4052)_PIN16 VDD, PIN8 VSS power
YES
NOCheck IC801(MC4580)_PIN2, 6 input waveform.
YES
Replace IC200.Replace IC200.
Replace IC200.
Check IC200(BU4052)_PIN3, 13output waveform and IC601(BU4052)_
PIN2, 15 input waveform.
YES
TAPE PCB ASS`Y
OK
3-11Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
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13. TAPE PLAY PART CHECK
TAPE PALY part check
Replace head wire and tapedeck mechanism.
NO NO
YES
YES
Check A deck head inputIC201_PIN32, 39 and B deckhead input IC201_PIN34, 37.
YES
YES
YES
YES
Check IC201_PIN5, 26 signal
output.
CheckIC201(HA12237)_PIN16
12V input.
Check A/Bdeck head input.
NO Refer toSMPS troubleshooting.
Check IC202_PIN10 "HIGH"NOCheck IC201_PIN14
mute operation.
Replace IC201.NO
YES
OK
Check IC201
YES
Replace IC202.NO
YES
OKOK
Check IC202.
3-12 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
14. TAPE REC PART CHECK
TAPE REC part check
Check IC100_PIN23 "HIGH"NO NO
YES
YES
Check IC201_PIN7, 24 record input.
Check P2203_PIN5, 3 inputand PIN8 erase input.
YES
YES
YES
YES
YES
Check L203_PIN2, 3oscillation.
CheckIC604(PS9829)_PIN49, 52
PWM output.
Check Q205(D1304)_base "HIGH".
Replace IC201.NO NOCheck IC201_
PIN10, 21 output.Check IC100_PIN23
"HIGH"
NO Refer to PWMmodulation troubleshooting.
OK
YES
Replace IC202.
YES
OK
OK
3-13Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
INTERNAL BLOCK DIAGRAM OF ICs
1. ES6838
SDRAM/ROMInterface
GPIO
+
Gateway
DMAController
HuffmanDecoder
ROM
DRAMInterface
RAM
VideoProcessor
TV-EncoderVDAC
HDMI I/F
DisplayOSD / SPUController
ScalerDeIntelacer16 K Cache
32-BitRISC
Processor
Audio ADC
Serial AudioInterface
Audio DAC
USB
DVDDescrambler
+Transport
ATAPI
Servo Controller / RF
8051µController
DSC
ECC
DigitalPLL
3-14 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2. HA12237F
3-15Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3. PS9829B
MBCK
SBCK
SLRCK
MLRCK
MSDIN[0:3]
SSDIN[0:3]
MIC_MCLK
DMIX_MCLK
OLRCK
OBCK
DMIX_SDOUT
PWM1_P/M
PWM2_P/M
PWM3_P/M
PWM4_P/M
PWM5_P/M
PWM6_P/M
PWM7_P/M
PWM8_P/M
PWM_HP_L_P/M
PWM_HP_R_P/M
PWM_SWL_P/M
EPD_ENA
OVERLOAD
MIC_BCK
MIC_LRCK
MIC_SDIN
SPI/I2C
SO/SDA
SCK/SCL
SI/I2C_AD0
/CS/I2C_AD2
EXT_MUTE
CLK
_IN
/RE
SE
T
PLL
_DV
DD
PLL
_DV
SS
PLL
_AV
DD
PLL
_AV
SS
DV
DD
DV
SS
IO_V
SS
IO_V
DD
Internal Controls
Internal Clock Internal Reset
HostInterface(I2C, SPI)
Mic,Input
Processor
InputMapper
SampleRate
Converter
Input&
OutputMUX
Serial AudioOutput
Interface
DownMixer
Mixer 4 BandEQ
BassManager
MainVolume
TrimVolume
SerialAudioOutput
Interface
PWMModulator
POPNRPower Supply
Out
put M
appe
r
PLL
Reset & Power Down
AutomaticGain
Limiter
4. PT6324
SG1/KS1
SG2/KS2
SG3/KS3
SG4/KS4
SG5/KS5
SG6/KS6
SG7/KS7
SG7/KS7
SG8/KS8
SG9/KS9
SG10/KS10
SG11/KS11
SG12/KS12
SG13/KS13
SG14/KS14
SG15KS15
SG16/KS16
SG17
SG18
SG19
SG20
SG21
SG22
SG23SG24
GR1
GR2
GR3
GR4
GR5
GR6
GR7
GR8
GR9
GR10
GR11
GR12
GR13
GR14
GR15
GR16
Segment Driver
Dimming Circuit
GridDriver
Control
DIN/DOUT
CLK
STB
OSC
LED1
K1 K2 VDD GND VEE
Timing Generator
Key Matrix Memory
LEDDriver
CSC
SerialData
Interface Display Memory
3-16 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
5. STR-S6757IF1905
4Vcc
StartStopBurst
OSC
Protectionlatch
DRIVEReg
Delay
BurstControl
BSD
OCP
GND
S
D
FB
FB
OCP/BD
SS/OLP
BD
Q
Q
S
S
R
R
MaxON
R Q
S
OLP
Reg&Iconst
Soft Start Counter
Bottom Selector
5
7
6
3
2
1
OVP
3-17Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
6. TAS5142
2nd-Order L-COutput Filter
for EachHalf-Bridge
BootstrapCapacitors
2-ChannelH-Bridge
BTL Mode
SystemMicrocontroller
OUT_A
OUT_B
OUT_C
OUT_D
BST_A
BST_B
BST_C
BST_D
RESET_ABRESET_CD
SystemPowerSupply
HardwireMode
Control
PVDD
GVDD (12 V)/VDD (12 V)
GND
HardwireOC Limit
M1
M3
PVDDPowerSupply
Decoupling
32 V
12 V
GND
VAC
PWM_A
PWM_C
PWM_D
PWM_B
VALID
M2
Left-Channel
Output
Right-Channel
Output
InputHúBridge 1
InputH-Bridge 2
GVDDVDD
VREGPower Supply
Decoupling
4
PV
DD
_A, B
, C, D
GN
D_A
, B, C
, D
GV
DD
_A, B
, C, D
4 4
VD
D
GN
D
VR
EG
AG
ND
OC
_AD
J
BootstrapCapacitors
2nd-Order L-COutput Filter
for EachHalf-Bridge
SD
OT
W
OutputH-Bridge 2
OutputH-Bridge 1
OTW
SD
TAS5508
3-18 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
7. U1739EJ2V1UD00/KF2_E
Port 0 P00 to P067
Port 1 P10 to P178
Port 2 P20 to P277
Port 3 P30 to P334
Port 4 P40 to P478
Port 5 P50 to P578
Port 6 P60 to P678
Port 7 P70 to P778
Port 12 P120 to P1245
Port 13 P130
Port 14 P140 to P1456
8
4
2
Key return
Reset control
On-chip debugNote 2
Multiplier ÷r
Systemcontrol
Voltageregulator
REGC
XT2/EXCLKS/P124
XT1/P123
XT1/P121RESET
OCD0ANote 2/X1, OCD1ANote 2/P31
KR0/P70 toKR7/P77
OCD0BNote 2/X2, OCD1BNote 2/P32
X2/EXCLK/P122
Internal high-speedoscillator
8
Buzzer output BUZ/P141
Clock outputcontrol
Power on clear/low voltage
indicator
POC/LVIcontrol
PCL/P140
EXLVI/P120
VDD,EVDD
VSS,EVSS
FLMD0
16-bit timer/event counter 00
TO00/TI010/P01
TO01/TI011/P06
TI000/P00
TI001/P05
TOH0/P15
TOH1/P16
TI50/TO50/P17
TI51/TO51/P33
RxD0/P11
TxD0/P10
RxD6/P14
TxD6/P13
SI10/P11
SO10/P12
SI11/P03
SO11/P02
SCK11/P04
SCK11/P05
SIA0/P143
SOA0/P144
SCKA0/P142
STB0/P145
BUSY0/P141
EXSCL0/P62
SDA0/P61
SCL0/P60
AVREF
RxD6/P14 (LINSEL)
INTP0/P120
INTP1/P30 toINTP4/P33
INTP5/P16
INTP6/P140,INTP7/P141
AVSS
ANI0/P20 toANI7/P27
SCK10/P10
RxD6/P14 (LINSEL)
16-bit timer/event counter 01
8-bit timer H0
8-bit timer H1
Watchdog timer
78K/0CPUcore
Internalhigh-speed
RAM
Internalexpansion
RAM
Flashmemory
BANKNote 1
Watch timer
8-bit timerevent counter 50
8-bit timerevent counter 51
Serialinterface UART0
LINSEL
Serialinterface UART6
Serialinterface CSI10
Serialinterface CSI11
Serialinterface CSIA0
Serialinterface IIC0
A/D converter
Interruptcontrol
Internal low-speedoscillator
3-19 3-20
WIRING DIAGRAM
6P5P3P
CD PCB
2 CH SPK TERMINALAUX
JACK
TU
NE
RM
OD
UL
E3 CHANGER MD
MAIN PCB
DOUBLE DECKMECHANISM
30P
4P
8P3P 13P
29P
USB MIC H/P FRONT PCB
SMPS PCB
15P
4P
[Total CNT Q'ty : 14ea]
1. SMPS MAIN : 2ea2. MAIN DVD : 2ea3. MAIN FRONT : 1ea4. FRONT DVD : 1ea5. DVD MD : 5ea6. DECK MECHA. : 3ea
REDRED
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-21 3-22
BLOCK DIAGRAMS1. SMPS BLOCK DIAGRAM
AC INPUT
ZNR & FILTER
TRANS
#1
AMPSwitchIC # 1
MAINSwitchIC # 2
TRANS
#2
FL1-FL2 (4.5V)
-12V
12V (78R12)
5V(P-SENS)
6.1V (KIA278R05) P9702
P9701
FEED BACK
AMP (+) 31.5V
3.5V (278R35)
-31. 5V(VKK)
RECTIFICATIONSMOOTHING
CIRCUIT
FEED BACK
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-23 3-24
2. MAIN & FRONT BLOCK DIAGRAM
USB
FL +/-
FR +/-
SW +/-
FL
FR
SW
PS9830
PWMModulator
9830_RSTCLK/DATA
5142_RST
5142_S12.288MHz
9.8304MHz
D
DE
CK
AD
EC
K B
HA12237F
CassetteDeckASP
L/R, REC_L/RERASE
L/R
TR DRIVER
DE
CK
S/W
REC_MUTE, PB_MUTE, TAPE_A/B
SOL_A/B, MOTOR, REC_BIAS
HALL_A/B, LEAF_A/B
TU
NE
R M
OD
ULE
RDS_CLK / DATA, PLL_DO / CLK / CE[5]
PLL_DI, T_MUTE[2]
REC_L / R
DE
CK
_L /
R
AUX
4052_A / BTUNER_L / R
AUX_L / R
BA3308OPAMP (ALC)
H/P_L / R
EEPROMCLK/DATA
VFD_STB / DI / DO / CLK
FS
EQ
,WR
Q,C
D_
DO
,RX
[4]
AUDIO L / R
MCLK, LRCK, BCK, SD_OUT [7]
ADC_RST
D+ / D-,+5V/G
14.3178MHz
16.9344MHz
ND
PICK UPPICK UP
MOTORMOTOR
MDMD
AUX2
[4]
[4]
[4]
[3]
LC78692W
DSP IC
OTI6888 VER.A9
AUX2 _L/R
AM5810MOTORDRIVER
TX
, RX A,B,C,D,E,F
74HCT244BUFFER
RX
TX
EIG
HT
KIN
DS
EX
CE
PT
CD
IN
STDATA, STCK, STREQ[3]
FDO,TDO SL+/-, SP+/-
OP/CL
TA+/-, FA+/-
SLDO,SPDO
FSEQ,WRQ,CD_DO
H/P
MIC
CLK,DATA,+5V,GND
CLK
,DA
TA
MIC _SIG
MIC
_S
IG
[5]
[4]
[4]
[4]
[4]
[4]
[4]
[4]
78F0546
AUDIOMICOM
KS24C021EEPROM
PT6324FLT
DRIVER
FLTDISPLAY
TOUCH PAD
CY8C21484TOUCHPADDRIVER IC
TAS5152or
TAS5142
DigitalPowerAMP
LRCK,BCK,DATA0 [3]
BU4052
AK53582CH.ADC
AUDIOS/W
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-25 3-26
SCHEMATIC DIAGRAMS1. SMPS SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
WHEN SERVICING THIS CHASSIS, UNDER NO CIR-CUMSTANCES SHOULD THE ORIGINAL DESIGN BEMODIFIED OR ALTERED WITHOUT PERMISSIONFROM THE LG CORPORATION. ALL COMPONENTSSHOULD BE REPLACED ONLY WITH TYPES IDENTI-CAL TO THOSE IN THE ORIGINAL CIRCUIT. SPECIALCOMPONENTS ARE SHADED ON THE SCHEMATIC
FOR EASY IDENTIFICATION. THIS CIRCUIT DIAGRAMMAY OCCASIONALLY DIFFER FROM THE ACTUALCIRCUIT USED. THIS WAY, IMPLEMENTATION OF THELATEST SAFETY AND PERFORMANCE IMPROVE-MENT CHANGES INTO THE SET IS NOT DELAYEDUNTIL THE NEW SERVICE LITERATURE IS PRINTED.
1. Shaded( ) parts are critical for safety. Replace onlywith specified part number.
2. Voltages are DC-measured with a digital voltmeter dur-ing Play mode.
IMPORTANT SAFETY NOTE :
3-27 3-28
2. MAIN SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-29 3-30
3. AMP SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-31 3-32
4. DECK SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-33 3-34
5. FRONT SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-35 3-36
6. KEY-L SCHEMATIC DIAGRAM 7. KEY-R SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-37 3-38
PRINTED CIRCUIT BOARD DIAGRAMS1. MAIN P.C.BOARD(TOP VIEW)
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-39 3-40
MAIN P.C.BOARD(BOTTOM VIEW)
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-41 3-42
2. FRONT P.C.BOARD
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-43 3-44
3. SMPS P.C.BOARD 4. KEY-L P.C.BOARD
5. KEY-R P.C.BOARD
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
3-45 3-46 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
MEMO MEMO
4-1Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
CD ELECTRICAL TROUBLESHOOTING GUIDE
1. CD PART TROUBLESHOOTING
Turn on CD
YES
YES
NO
OPEN CLOSE check Connector check (PN803, PN804)NO
Check voltage CN806PIN1 : 12, PIN2 : 6.3V
NO
Check voltage PN805PIN22 : CLOSE, PIN23 : OPEN
YES
NO
“Reading”Display check
Connector check(PN802, PN803, PN804, CN806, PN814)
NO
Check micom interface circuit (PN805)(CE, BTL-MUTE, CD-IN, CD-OUT, CLK, WRQ, FSEQ)
YES
NO
Reading OK check Connector check (PN801,PN802)NO
YES
If PALY, AUDIOOUTPUT check
Check PN805 audio dataPIN10 : DA_LRCK (IC801 PIN60 LRSY)PIN11 : DA_BCK (IC801 PIN59 DATACLK)PIN12 : DA_DATA0 (IC801 PIN58 DATA)
NO
Check pick up movement
NO
Check AM5810FP (IC802)
NO
Check LC78692 (IC801)
OK
SECTION 4 CD PART ELECTRICAL
4-2 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
1-1. OPEN CLOSE NG
Connector locking check(PN803, PN804, PN814)
YES
YES
YES
YES
Check powersupply circuit (PN805, CN806)CN806 PIN1 : 12V, PIN2 : 6.3V
PN805 PIN8 : +5V_AD
Defective main power supplyNO
Check voltage change LO+, LO- OF IC803(PN805 PIN23 : OPEN, PIN22 : CLOSE)
Defective IC803
Defective mechanism
NO
Check voltagechange of OPEN CLOSE
IC803 INPUT voltage PIN6 : 12V, PIN7:6.3V (PN805 PIN2 : BTL_MUTE, 23 : OPEN,
22 : CLOSE)
Defective micomNO
4-3Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
1-2. “READING” DISPLAY CHECK (= ONLY “CD” DISPLAY)
Conector locking check(PN802, PN803, PN804, PN805, CN806)
YES
YES
YES
YES
YES
Check powersupply port (PN805, CN806)
CN806 PIN1 : 12V, PIN2 : 6.3V,PIN4 : 5V PN805PIN8 = 5V_AD
Defective connector or main power supply
Defective IC804
NO
Check micom interface circuit (PN805)PN805 PIN1, 3, 4, 15, 19, 26 signal check(1 : CE, 3 : DI, 4 : CLK, 15 : D0, 19 : RST,
18 : FSEQ, 26 : WRQ) PIN3 DI : From DSPto micom PIN15 DO : From micom to DSP
Check the waveform #1
Defective micom or connector
Defective IC804
NO
Check voltageThe PIN2 of IC804IC804 PIN2 : 3.3V
NO
Defective micom or connectorCheck reset
signal of PN805PN805 PIN19 : 5V
NO
4-4 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
Connector locking check(PN801, PN802)
Is reading OK?
Defective pick up orIC802 or IC801Does sled move?
NONO Check PN802PIN3, 4 (SL+, SL-)
1-3. READING OK CHECK (= “NO DISC” DISPLAY)
Does lense move?(= UP & DOWN)
YES
A
YES
Defective pick up orIC802 or IC801
NONO Check PN801PIN13, 16 (FA+, FA-)
B
Defective pick up or IC802Does laser light?NONO
Check PN801 PIN10 (LD)
YES
C
Defective pick up orIC802 or IC801Does spindle rotate?
NONO Check PN802PIN3, 6 (SP+, SP-)
YES
D
Defective pick up orIC802 or IC801
NONO Check PN801PIN14, 15 (TA+, TA-)
E
4-5Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
Defective IC801
DoesSL+ waveform
appear at (IC802 PIN13and PN802 PIN3)
waveform #2sled motor
wave
Does slinwaveform appear at
(IC802 PIN5)waveform #2
sled drivewave
NONO
1-4. READING OK CHECK #A (= “NO DISC” DISPLAY)
YES
YES
A
Defective IC802
NODefective PN802 connector
Defective pick up sled motor
Check PN802 connector line
YES
Defective IC801
DoesFA+ waveform
appear at (IC802 PIN16and PN801 PIN13)waveform #3 focus
coil drivewave
Doesfain-waveform
appear at (IC802 PIN25)waveform #3focus drive
wave
NONO
1-5. READING OK CHECK #B (= “NO DISC” DISPLAY)
YES
YES
B
Defective IC802
NODefective PN801 connector
Defective pick upfocus actuator
Check PN801 connector line
YES
4-6 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
Defective IC804
Is ?V appliedto PIN10 of PN801laser supply voltage
check
Is 3.3Vapplied to
PIN30, 36, 39, 41, 61,68, 75 of IC801 RF IC
supply voltagecheck
NONO
1-6. READING OK CHECK #C (= “NO DISC” DISPLAY)
YES
YES
Defective IC801Is 2.3V
PIN18 (LDO) of IC801laser control voltage
check
NO
YES
C
Defective Q801 or D801
NODefective PN801 connector
Defective pick up laser part
Check PN801 connector line
YES
4-7Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
Defective IC801
DoesSP+ waveform
appear at (IC802PIN11 and PN802 PIN5)
waveform #4 spindlemotor drive
wave
Doesspin waveform
appear at (IC802 PIN6)waveform #4spindle drive
wave
NONO
1-7. READING OK CHECK #D (= “NO DISC” DISPLAY)
YES
YES
D
Defective IC802
NODefective PN802 connector
Defective pick upspindle motor
Check PN802 connector line
YES
4-8 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
Does FE, TE signalappear? (IC801
PIN10 : RFMON, PIN16 : TE)waveform #6
* REMON is FE
Defective IC801
DoesTA+ waveform
appear at (IC802 PIN17and PN801 PIN14)
waveform #5 trackingcoil drive
wave
Doestain - waveform
appear at (IC802 PIN22)waveform #5tracking drive
wave
NONO
1-8. READING OK CHECK #E (= “NO DISC” DISPLAY)
YES
YES
E
Defective IC802
Does ARF signal appear?
(IC801 PIN 2)waveform #6
NODefective pick up or IC801
Check PN802connector line
NODefective PN802 connector
YES
YES
NODefective pick up or IC801
4-9Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
2. USB PART TROUBLESHOOTING
Turn on USB
YES
NO
YES
Connector check(PN805, CN806, PN810 )
NO
Check power supply circuit (CN806)
Check micom interface circuit (PN805)PIN13 : RX (IC805 PIN49 : TXD)PIN14 : TX (IC805 PIN33 : RXD)
NO
NO
Check PN810 PIN2(D-), 3(D+)
Check OTI6888 (IC805)
Connector check (CN806)OK
YES
“Checking” or“USB” display check
NO
YES
Check PN810 1PIN : 5VReading OK checkNO
Check signal STCK, STREQ, STDATASTCK : IC805 PIN52, IC801 PIN55
STREQ : IC805 PIN53, IC801 PIN54STDATA : IC805 PIN54, IC801 PIN56
If PLAY, AUDIOOUTPUT check
NO
NO
4-10 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
WAVEFORMS OF MAJOR CHECK POINT
#1.MICOM INTERFACE WAVEFORM(PN805 PIN26, 19, 3, 15) during power on
PIN26 : WRQ
PIN19 : RESET
PIN3 : DI (IC801 PIN46 DATA OUT)
PIN15 : DO (IC801 PIN45 DATA IN)
#1.MICOM INTERFACE WAVEFORM(PN805 PIN26, 19, 3, 15) during normal play
PIN26 : WRQ
PIN19 : RESET
PIN3 : DI (IC801 PIN46 DATA OUT)
PIN15 : DO (IC801 PIN45 DATA IN)
#1.MICOM INTERFACE WAVEFORM(PN805 PIN4, 1, 18) during power on
PIN4 : CL
PIN1 : CE
PIN18 : FSEQ
#1.MICOM INTERFACE WAVEFORM(PN805 PIN4, 1, 18) during normal play
PIN4 : CL
PIN1 : CE
PIN18 : FSEQ
4-11Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
#2.SLED DRIVE AND MOTOR WAVEFORM(IC802 PIN5, 13) when focus search
PIN5 : SLIN
PIN13 : SL+
#2.SLED DRIVE AND MOTOR WAVEFORM(IC802 PIN5, 13) during normal play
PIN5 : SLIN
PIN13 : SL+
#3.FOCUS DRIVE AND MOTOR WAVEFORM(IC802 PIN25, IC802 PIN16)
• When focus search failed or there is nodisc on tray
PIN25 : FAO
PIN16 : FA+
#3.FOCUS DRIVE AND MOTOR WAVEFORM(IC802 PIN25, IC802 PIN16)
• There is disc on tray and focus search success
PIN25 : FAO
PIN16 : FA+
4-12 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
#4.SPINDLE DRIVE AND MOTOR WAVEFORM(IC802 PIN6, 11) when TOC reading
PIN6 : SPINPIN11 : SP+
#5.TRACK DRIVE AND MOTOR WAVEFORM(IC802 PIN22, IC802 PIN17) during normal play
#6.RF, FOCUS AND TRACKING ERROR WAVEFORM(IC801 PIN2, 10, 16) during normal play
PIN2 : RFOUT
PIN 16 : TE
PIN10 : RFMON(FE)
PIN22 : TAO
PIN17 : TA+
4-13 4-14
SCHEMATIC DIAGRAMS1. CD SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
4-15 4-16
2. USB SCHEMATIC DIAGRAM
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
4-17 4-18
PRINTED CIRCUIT BOARD DIAGRAMCD P.C.BOARD(TOP VIEW) (BOTTOM VIEW)
Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
4-19 4-20 Copyright © 2009 LG Electronics. Inc. All right reserved.Only for training and service purposes
LGE Internal Use Only
MEMO MEMO