MiTAC 8355 User Manual

154

Correct it.

1.Check if the driver is installed properly
2.Check if the connect with the 

LAN properly  

Yes

No

Test

OK?

Correct it.

NO

Check if BIOS setup is ok. 

Re-test

OK?

Board-level

Troubleshooting

Replace

Motherboard or

I/O board

Check the following parts for cold solder or 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.

Yes

LAN_TX+

LAN_TX-

LAN_RX+

LAN_RX-

PJTX+

PJTX-

PJRX+

PJRX-

PJ4

PJ7
LAN_COL
LAN_CRS
LAN_DATAIO
LANPHYI_RESET#

LAN_MRXD0
LAN_MRXD1
LAN_MRXD2
LAN_MRXD3
LAN_MRXDV
LAN_MRXER
LAN_MRXC
LAN_MTXD0
LAN_MTXD1
LAN_MTXD2
LAN_MTXD3
LAN_MTXE
LAN_MTXC
LAN_DCLK

U20
U12
U502
J527
RP527
RP19
R686
R557
R552
R559
R561
R553
R691
R230
R554
R555
Q11
Q12

X2
L541
L49
L51
R34
R35
R27
R30
R49
R45
R38
R46
C112
R51
R783
C120