MiTAC 8050QMA Manuel de service télécharger pdf (Page 120)

119

50QMA

N/B Maintenance

8.5 Memory Test Error-1

Extend DDRAM is failure or system hangs up.

Memory Test Error

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.

Test

OK?

Correct it.

Yes

Parts:

U710

J713

J714

R691

R692

R606

R242

C285

C604

Signals:

1. Check if on board SDRAM chips are no cold

solder.

2. Check the extend SDRAM module is installed

properly. ( J713,J714)

3. Confirm the SDRAM socket (J713,J714) is

ok,no band pins.

If your system host bus clock running at

266MHZ then make sure that SO-DIMM

module meet require of PC 266.

Test

OK?

Yes

+1.8V

+3VS

S[A..B]_MA[0..13]

CKE#[0..3]

CS#[0..3]

ODT[0..3]

S[A..B]_BS#[0..2]

S[A..B]_CAS#

S[A..B]_RAS#

S[A..B]_WE#

S[A..B]_DQS#[0..7]

S[A..B]_DQS[0..7]

S[A..B]_DM[0..7]

S[A..B]_DQ[0..63]

Board-level

Troubleshooting

Replace

Motherboard

Replace the faulty

DDRAM module.

SMBDATA

SMBCLK

NB_CLK _DDR[0,1,3,4]

NB_CLK _DDR[0,1,3,4]#

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MiTAC 8050QMA Manuel de service Page 120

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