Keyboard (K/B) Touch-Pad (T/P) Test Error - MiTAC 8050QMA Service Manual

8.6 Keyboard (K/B) Touch-Pad (T/P) Test Error-1

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.
Yes
Test
Ok?
No
80 50QMA
80 50QMA
Board-level
Troubleshooting
No
Correct it.
Replace
Motherboard
Replace the faulty
Keyboard or Touch-Pad.
N/B Maintenance
N/B Maintenance
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
U13
U14
U709
X2
SW3
SW4
F2
J4
J5
L48
Check
Yes
J4, J5
for cold solder?
No
Signals
+3VS
+VDD3
+KBC_CPUCORE
KI[0..7]
KO[0..15]
T_CLK
T_DATA
Re-soldering.
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