Service manual

8224 N/B Maintenance
8224 N/B Maintenance
127
8.7 Keyboard (K/B) or Touch-Pad (T/P) Test Error-1
Error message of keyboard or touch-pad failure is shown or any key does not work.
Keyboard or Touch-Pad
Test Error
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
U15
U13
J3
J4
L557
X1
R378
L29~L31
Signals
Is K/B or T/P
cable connected to notebook
properly?
Yes
No
Correct it.
Board-level
Troubleshooting
Replace
Motherboard
VDD3
+KBC_VDD
KI[0..7]
KO[0..15]
LAD[0..3]
SERIRQ
LFRAME#
INSTAND_KEY
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