160
8175 N/B MAINTENANCE
8175 N/B MAINTENANCE
Keyboard or Touch-Pad
Test Error
Try another known good Keyboard ,
Touch-pad.(Internal or external) or
Audio BD
Test
Ok?
Replace the faulty
Keyboard or Touch-
Pad,Audio BD
Yes
No
Yes
No
Correct it.
Is K/B or
T/P cable connected to
notebook
properly?
Board-level
Troubleshooting
Replace
Motherboard
One of the following parts 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.
Parts
U17 U509
U13 R78
U508 L520
J12 X503
R627 C633
C630
Signals
IRQ1
IRQ12
-IOR
-IOW
XD[0:7]
-H8_KBCS
-H8_A20GATE
-H8_MCCS
KO[0:15]
KI[0:7]
T_CLK
T_DATA
XTAL
EXTAL
8.7
Keyboard (K/B) Touch-Pad (T/P) Test Error
Error message of keyboard or touch-pad failure is shown or any key does not work.
Audio BD:
L6-L8
C1-C3
J6