MiTAC 8355 service manual Memory Test Error, Parts

8355 N/B MAINTENANCE

8.6 Memory Test Error

Symptom:

Either on board or extend DDR RAM is failure or system hangs up.

Memory Test Error

1.If your system installed with expansion DIMM module then check them for proper installation.

2.Make sure that your DIMM sockets are OK. 3.Then try another known good DIMM

modules.

Board-level

Troubleshooting

Check	Yes
U503,U20
J6,J7	Re-soldering
For any cold
solder?

Test	Yes	Replace the faulty
OK?		DDR module.

No

No

One of the following components or signals on the motherboard may be defective ,Use an oscilloscope to check the signals or replace the parts one at A time and test after each replacement.

If your system host bus clock running at 800MHZ then make sure that DIMM module meet require of PC-2100/2700/3200.

Test	Yes	Replace the faulty
Ok?		DDR RAM module.

No

Replace

Motherboard

Parts:

U503	RP503
U20	RP505
U9	RP507
J6	RP509
J7	RP511
R538	RP514
R88	RP518
R86	RP520
R536	RP522
R535	RP525
R537	RP526
R284	RP530

Signals:

DDR_CLK[0:1] CPUCLK+

DDR_CLK[4:7] CPUCLK-

DDR_CS[0:3]# SMBCLK_DDR

CPU_CKEA SMBDATA_DDR CPU_CKEB

CPU_MD[0:63]

CPU_DQM[0:7]

CPU_DQS[0:7] MEMADD_A[0:13] DDR_CASA# DDR_BAA[0:1] DDR_RASA#

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