6.6 Keyboard (K/B) or Touch-Pad (T/P) Failure
Error message of keyboard or touch-pad test error is shown or any key does not work.
Keyboard (K/B) or Touch-Pad (T/P)
Failure
Try another known good Keyboard
or Touch-pad.
Test
Ok?
Replace the faulty
Keyboard or Touch-Pad.
Check
J3, J4
for cold solder?
Yes
No
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.
Yes
No
Re-soldering.
Parts
U16
U712
J3
J4
L44
C321
EL45
EL47
SW2
SW3
Is K/B or T/P
cable connected to notebook
properly?
Yes
No
Correct it.
Board-level
Troubleshooting
Replace
Motherboard
Signals
+5VS
KI[0..7]
KO[0..15]
KBD_US/JP#
TP_CLK
TP_DAT
T_DATA_C
T_CLK_C
SW_LEFT
SW_RIGHT