Service manual

118
8258I N/B Maintenance
8258I N/B Maintenance
8.4 Keyboard (K/B) or touch pad (T/P) Test Error-1
Error message of keyboard or touch pad test error 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
J4, J6
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
U515
U513
J4
J6
X502
SW1
SW2
F1
EL16
EL532
EL533
Is K/B or T/P
cable connected to notebook
properly?
Yes
No
Correct it.
Board-level
Troubleshooting
Replace
Motherboard
Signals
KI[0..7]
KO[0..15]
SERIRQ
KBD_US/JP#
LFRAME#
LPC_LAD[0..3]
SW_LEFT
SW_RIGHT
T_CLK
T_DATA
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