mitac 8355.pdf - tim.id.au
mitac 8355.pdf - tim.id.au
mitac 8355.pdf - tim.id.au
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Keyboard or Touch-Pad<br />
Test Error<br />
Try another known good Keyboard<br />
or Touch-pad.<br />
Test<br />
Ok?<br />
8355 N/B MAINTENANCE<br />
8.7 Keyboard (K/B) Touch-Pad (T/P) Test Error<br />
Symptom:<br />
Error message of keyboard or touch-pad failure is shown or any key does not work.<br />
Is K/B or<br />
T/P cable connected to<br />
notebook<br />
properly?<br />
Yes<br />
No<br />
Yes<br />
No<br />
Correct it.<br />
Replace the f<strong>au</strong>lty<br />
Keyboard or<br />
Touch-Pad<br />
Board-level<br />
Troubleshooting<br />
Replace<br />
Motherboard<br />
Check<br />
U511, J8, J10<br />
for cold Solder?<br />
No<br />
Yes<br />
Re-soldering<br />
One of the following parts or signals on the motherboard<br />
may be defective, use an oscilloscope to check the signals<br />
or replace the parts one at a <strong>tim</strong>e and test after each<br />
replacement.<br />
Parts<br />
Signals<br />
U509<br />
U511<br />
U19<br />
J8 ~9<br />
SW4~9<br />
L517<br />
R205<br />
R209<br />
L522<br />
L523<br />
R640<br />
C759<br />
X4<br />
R642<br />
C678<br />
C679<br />
KBD_CS0<br />
KI [0:7]<br />
KO [0:15]<br />
SD [0:7]<br />
ISA_IOR#<br />
ISA_IOW#<br />
ISA_IRQ1<br />
ISA_IRQ12<br />
ROMCS#<br />
H8_KBCS#<br />
ISA_MCCS#<br />
H8_MCCS#<br />
H8_T_CLK<br />
T_DATA<br />
SCRL_RIGHT<br />
SCRL_LEFT<br />
SCRL_UP<br />
SCRL_DN<br />
SW_LEFT<br />
SW_RIGHT<br />
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