104
7521
7521
N/B MAINTENANCE
N/B MAINTENANCE
7.6 KEYBOARD(K/B) TOUCH-PAD(T/P) TEST ERROR
Error message of keyboard or touch pad failure is shown or any key doesn’t work.
KEYBOARD TEST ERROR
Try another known good K/B or
T/P (Internal or external).
Test
OK?
Replace M/B or
into board-level
Troubleshooting
NO
YES
Replace the faulty
K/B or T/P then end.
Board-level
Troubleshooting for
K/B or T/P test error.
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.
Parts:
U12, U31 R162, R161
L57, L56
L23, C171
R246, R254 J4, U17
L58, C245
CHARGE BD
RP519, J5 SWITCH BD
Signals:
KI[0:7] IOW#
KO[0:15] IOR#
H8/T_DATA IRQ1
H8/T_CLK
IRQ12
H8_KBCS# SD[0:7]
Check if K/B or T/P cable installed
properly.
Test
OK?
NO
Correct it then
end.
YES
Check if
U12, J5, J515 and J502
are cold solder or not.
Test
OK?
NO
Replace or Re-solder
U12, J5, J515 and J502
YES
