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Prestigio Cavaliere 141
8.7
Keyboard (K/B) Touch-Pad (T/P) Test Error
Symptom:
Error message of keyboard or touch-pad failure is shown or any key does no
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.
Yes
Test
Ok?
No
No
Correct it.
Board-level
Troubleshooting
Replace
Motherboard
Replace the
faulty
Keyboard or
Touch-Pad
Check
U13, J4, J5
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.
Parts
U519
U13
U518
J4 ~5
SW2~7
R698
R171
F3
L19
CP504
113
Technical Service Manual
t work.
Yes
Re-soldering
No
Signals
ISA_KBCS#
R174
KBD_US/JP#
R175
KI [0:7]
H8_KBCS#
T_CLK
L20
KO [2:15]
L522
ISA_SD [0:7]
T_DATA
R101
IOR#
SCRL_RIGHT
X2
IOW#
SCRL_LEFT
C241
IRQ1
SCRL_UP
C235
IRQ12
SCRL_DN
R575
KO0
SW_LEFT
R585
KO1
SW_RIGHT
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