memory sephiroth kwon grma 26-05-2009. outline introduction ddr ii ddr iii repair flow chart repair...
TRANSCRIPT
Memory
Sephiroth Kwon
GRMA
26-05-2009
Outline
• Introduction• DDR II• DDR III• Repair Flow Chart• Repair Technique
Introduction
NorthBridge
Main Clock Gen.
Memory Module
NorthBridge
Main Clock Gen.
Memory Module
CPU
Type 1
Type 2
DDR II
DDR2
• DDR2 SDRAM (Double Data Rate Two Synchronous Dynamic Random Access Memory)
• DDR2 modules use a 1.8V power supply• DDR2 has 240 pins
DDR2
DDR3
• DDR3 SDRAM(Double Data Rate Three Synchronous Dynamic Random Access Memory)
• DDR3 SDRAM improves on DDR2 SDRAM in several significant ways:– Higher bandwidth due to increased clock rate – Reduced power consumption due to 90nm fabrication
technology – Pre-fetch buffer is doubled to 8 bits to further increase
performance – The voltage of DDR3 SDRAM DIMM's was lowered from
1.8V to 1.5V. This reduces power consumption and heat generation, as well as enabling more dense memory configurations for higher capacities.
DDR3
Repair Flow ChartSTART
Visual Inspectioncheck memory slot is no bent pin
or damaged.
Measure memory Voltage
Measure memory DQ /Address,RAS#,CAS#,WE#
Measure memory Clock
Change NB
Change any damaged memory slot
Check memory Voltage 1.5V (1.8 or 3V) dual & Vtt
Check memory CLK100/133/166..Mhz
Compare with good MB, trace NG signal
Fix any trace open or resistor damaged
Fix any trace or RLC damaged, change NG
CLK Generator
Fix any voltage regulator or small inductor../trace
open
Finished
OK
NG
NG
NG
OK
OK
OK
NG
NG
NG
NG
NG
OK
OK
OK
OK
Repair Technique-Visual Inspection
Visual Inspection to check memory slot is not damaged or bent pin inside.
1
Repair Technique-Measure Memory Voltage
Use Multi-Meter or Oscilloscope to measure Memory Voltage.
Memory Voltage:
DDR2: 1.8 Dual, 0.8Vtt_DDR
DDR3: 1.5 Dual,
2-2
2-1
Repair Technique-Measure Memory Clock
Use Oscilloscope to measure Memory Clock (100Mhz or 133Mhz, 166Mhz…depends on different chipset & memory)
3-1
3-2
Repair Technique-Measure Memory Signals
Plug Memory measure card into slot. Use Multi-Meter to measure memory signals’ bias voltage value. Compare with good MB if you find any unusual.
4-1
Thank You!