Service manual

139
8575
8575
A N/B Maintenance
A N/B Maintenance
8.6 Keyboard (K/B) Touch-Pad (T/P) Test Error
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
Yes
No
Check
U509, J13, J20
for cold solder?
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
U511
U11
U509
J13
J20
L521
R146
R690
F1
L29
Signals
+5VA
H8_AVREF1
+3VS
+5V
-ROMCS
-MCCS
KI[0:7]
KO[0:15]
T_CLK_H8
T_DATA
Yes
No
Correct it.
Is K/B or
T/P cable connected to
notebook
properly?
Board-level
Troubleshooting
Replace
Motherboard
KBD_US/JP#
SA2
IRQ1
IRQ12
-IOR
-IOW
L33
L31
SW503
RP48