MiTAC 8355 User Manual

131

Replace
LCD.

Board-level

Troubleshooting

Yes

NO

LCD module

OK?

Make sure that CPU module,
DIMM memory are installed
Properly.

Display

OK?

Yes

No

Correct it.

Replace

Motherboard

1.Try another known good CPU  

module, DIMM module and BIOS.

2.Remove  all of I/O device (HDD, 

CD-ROM…….) from

motherboard except LCD

Display

OK?

1. Replace faulty part.
2. Connect the I/O device to the

M/B one at a time to find out
which part is causing the problem. 

Yes

No

One of the following parts on the mother-board may be 
defective, use an oscilloscope to check the following signal or 
replace the parts one at a time and test after each replacement.

+3V
CPUCK+
CPUCK-
GCLK_NB
66M_AGP
SMB_DATA1
SMB_CLK1
USB_CLK
SB_VCLK
PCI_SB_CLK
14M_SB_IOSC
CODEC_XIN
PCI_CARD_CLK
PCI_1394CLK
CLK_LPC33
MINI_PCI_CLK
14M_SB_APICCLK

PWRBTN#
H8_RESET#
SB_PWRBTN#
RSMRST#
ALL_PWROK_5V
ALL_PWROK_2.5V
MAIN_PWROK
PG_1.2V
PG_VCC_CORE
PCIRST#
CARD_RESET#
PCI_1394_RESET#
MINIPCI_RESET#
AGP_RESET#
HDD_RST#
CDROM_RST#
LPC_SPIO_RESET#

U9
C191
C189
R531
R92
R94
R284
R536
R78
R91
R73
R646
R90
D2

SW2
U11
U13
U507
U510
U511
U513
X5
X501
Q15
Q533
Q534
R611
R617
R633
R727
R789

R96
R97
R785
X1
C182
C212
R72
R77
R87
R89
R82
R183
L510