137
8575
8575
A N/B Maintenance
A N/B Maintenance
8.5 Memory Test Error
Extend DDR SDRAM 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?
Yes
No
Parts:
U4
U508
U9
J505
J506
RP8~RP12
RP13~RP15
RP16~RP20
R632
R614
R658
R662
R98
R100
R102
R97
R101
R103
Signals:
1.If your system installed with expansion
SO-DIMM module then check them for
proper installation.
2.Make sure that your SO-DIMM sockets
are OK.
3.Then try another known good SO-DIMM
modules.
If your system host bus clock running at
266MHZ then make sure that SO-DIMM
module meet require of PC 266.
Test
Ok?
Replace the faulty
DDR SDRAM module.
Yes
No
+2.5V_DDR
+DDRVREF
CKE[0:3]
DDR_DQM[0:7]
DDR_MD[0:63]
DDR_BA [0,1]
DDR_CS[0:3]#
DDR_MA[0:12]
DDR_DQS[0:7]
DDR_RAS#
DDR_CAS#
DDR_WE#
SDRAMCLK
FWDSDCLK
SMBDATA
SMBCLK
CLK_DDR[0:5]
CLK_DDR[0:5]#
Board-level
Troubleshooting
Replace
Motherboard
R90
R91
R98
R88
R94
R93
Replace the faulty
DDR SDRAM module.