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TECHNICAL SERVICE MANUAL
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
Is K/B or T/P
cable connected to notebook
properly?
Yes
Try another known good Keyboard
or Touch-pad.
Test
Ok?
No
No
Correct it.
Yes
Replace the faulty
Keyboard or Touch-Pad.
Board-level
Troubleshooting
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.
Replace
Motherboard
Parts
U512
U7
J4,J5
SW6,SW7
U12
F502
L525
R48
C49
CP504
X2
124
Check
Yes
J4, J5
for cold solder?
No
Signals
+KBC_VDDA
KI[0..7]
KO[0..15]
T_CLK
T_DATA
Prestigio Nobile 150
Re-soldering.
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