112
80
80
50QMA
50QMA
N/B Maintenance
N/B Maintenance
There is no display on both LCD and VGA monitor after power on although the LCD and monitor is known-good.
8.2 No Display-1
No Display
Monitor
or LCD module
OK?
Replace monitor
or LCD.
Board-level
Troubleshooting
System
BIOS writes
error code to port
378H
?
Yes
No
Yes
No
Refer to port
378H
error code description
section to find out
which part is causing
the problem.
Make sure that CPU module,
DIMM memory are installed
Properly.
Display
OK?
Yes
No
Correct it.
To be continued
Clock,reset and power checking
Check system clock,
reset circuit and
reference power
Replace
Motherboard
1.Try another known good CPU module,
DIMM module and BIOS.
2.Remove all of I/O device ( HDD,
CD-ROM…….) from motherboard
except LCD or monitor.
Display
OK?
1. Replace faulty part.
2. Connect the I/O device to the M/B
one at a time to find out which part
is causing the problem.
Yes
No
MiTac Secret
Confidential Document
