memory sephiroth kwon grma 26-05-2009. outline introduction ddr ii ddr iii repair flow chart repair...

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!