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M722 N/B MAINTENANCE
M722 N/B MAINTENANCE
6.5 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:
U16, U516 R162, R161
RP57, SW1 L23, C171
R134, J4
J4, U17
J5, L20, L19 SW BD
SW2, SW3
Signals:
KI[0:7] IOW#
KO[0:15] OR#
T_DATA
IRQ1
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
U16, J5 and J4
IS
cold solder .
Test
OK?
NO
Replace or
Re-solder
U16, J5 and J4
YES