MiTAC 8355 User Manual
8355 N/B MAINTENANCE
8355 N/B MAINTENANCE
139
Correct it.
Try another known good Keyboard
or Touch-pad.
or Touch-pad.
Keyboard or Touch-Pad
Test Error
Test
Ok?
Ok?
Replace the faulty
Keyboard or
Touch-Pad
Keyboard or
Touch-Pad
Yes
No
Check
U511, J8, J10
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.
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
U509
U511
U19
J8 ~9
SW4~9
L517
R205
R209
L522
L523
U511
U19
J8 ~9
SW4~9
L517
R205
R209
L522
L523
Signals
KBD_CS0
KI [0:7]
KO [0:15]
SD [0:7]
ISA_IOR#
ISA_IOW#
ISA_IRQ1
ISA_IRQ12
ROMCS#
H8_KBCS#
KI [0:7]
KO [0:15]
SD [0:7]
ISA_IOR#
ISA_IOW#
ISA_IRQ1
ISA_IRQ12
ROMCS#
H8_KBCS#
Yes
No
Is K/B or
T/P cable connected to
notebook
properly?
Board-level
Troubleshooting
Replace
Motherboard
Symptom:
Error message of keyboard or touch-pad failure is shown or any key does not work.
Error message of keyboard or touch-pad failure is shown or any key does not work.
R640
C759
X4
R642
C678
C679
C759
X4
R642
C678
C679
ISA_MCCS#
H8_MCCS#
H8_T_CLK
T_DATA
SCRL_RIGHT
SCRL_LEFT
SCRL_UP
SCRL_DN
SW_LEFT
SW_RIGHT
H8_MCCS#
H8_T_CLK
T_DATA
SCRL_RIGHT
SCRL_LEFT
SCRL_UP
SCRL_DN
SW_LEFT
SW_RIGHT
8.7 Keyboard (K/B) Touch-Pad (T/P) Test Error