MiTAC 7521 PLUS/N User Manual
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7521
7521
Plus / N N/B MAINTENANCE
Plus / N N/B MAINTENANCE
8.6 KEYBOARD(K/B) TOUCH-PAD(T/P) , ESB 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
YES
Replace the faulty
K/B or T/P then end.
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 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.
Signals:
KI[0:7] IOW#
KO[0:15] IOR#
H8/T_DATA IRQ1
H8/T_CLK
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.
properly.
Test
OK?
NO
Correct it then
end.
end.
YES
Check if
U14, J5, J515 and J502
are cold solder or not.
Test
OK?
Replace or Re-solder
U14, J5, J515 and J502
YES
Parts:
U14, U31
R520, RP18
FA5, L3
F1, L53
L54, RP7
U11, L55
C262, J3
J501
R520, RP18
FA5, L3
F1, L53
L54, RP7
U11, L55
C262, J3
J501
CHARGE BD
SWITCH BD
SWITCH BD
NO
NO