UNIWILL N241S1 Troubleshooting Guidelines
Chapter 5 Troubleshooting Guidelines
UNIWILL COMPUTER CORP.
No. 24, Pei Yuan Rd., Chung Li Industrial Park
Chung Li City, Taiwan, R.O.C.
TEL: 886-3-461-6000
FAX: 886-3-461-8000
URL: http://uniwill.com.tw/
N241S1 Rev : A Page 5 - 1
Chapter 5 Troubleshooting Guidelines
Trouble Shooting List
5.1 No display
5.2 VGA controller failure
5.3 LCD no display / Invalid picture
5.4 External monitor has no display or color incorrect
5.5 Memory test error
5.6 Keyboard test error
5.7 Touch pad test error
5.8 Diskette drive test error
5.9 Hard disk drive test error
5.10 CMOS test error
5.11 SIO port test error
5.12 PIO port test error
5.13 Audio failure
5.14 No power symptom
5.15 CDROM drive test error
5.16 Stopping in LCD screen while booting
5.17 PCMCIA Card Bus failure
5.18 IR Port cannot transfer data
5.19 Modem Failure
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5.1 No display (system failure)
Symptom: There is no display on both LCD and Monitor after power on although
the LCD and Monitor are known-good.
Chapter 5 Troubleshooting Guidelines
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No
No
No
No
No Display
Monitor or LCD module ok?
Yes
Set up Display type in BIOS
Display Ok?
Chapter 5 Troubleshooting Guidelines
Replace monitor or LCD
Yes
Setup the display mode
Remove all of I/O device & cables from M/B except LCD or Monitor
Yes
Correct the I/O device & cables to the
Display ok
Replace motherboard
Board level troubleshooting
Check SIS 630S for
any cold solder?
M/B one at a time to find out which
Yes
Re-solder
Check system clock and reset circuit
5.2 VGA controller failure
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VGA Controller Failure
time to find out which part is causing the problem
controller
for cold solder?
Re-solder
No
No
No
Symptom: There is no display on both LCD and Monitor although
Power-On-Self-Test is passed
Try another good monitor or LCD module
Yes
Display OK
Remove all of I/O devices and cables from M/B except LCD or Monitor
Chapter 5 Troubleshooting Guidelines
Replace faulty LCD or monitor
Yes
Display OK
Replace Motherboard
Board level troubleshooting
Check SIS 630S
Connect the I/O device & cables to the M/B one per
Yes
Replace SIS630S controller or Motberboard
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5.3 LCD no display or Invalid Picture
Symptom: The LCD shows nothing or abnormal picture, but it is good for external
monitor.
Chapter 5 Troubleshooting Guidelines
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OK?
No
test after each replacement
LCD No Display
Try another known good LCD module
Chapter 5 Troubleshooting Guidelines
Display
Yes
LCD Type correct
in CMOS Setup ?
Yes
Replace
Board level troubleshooting
No
Replace each parts of
LCD module / cables and
test
Correct it
Check LCD module and SIS630S controller, replace the parts one at a time and
5.4 External monitor has no display or color abnormal
Symptom: The CRT monitor shows nothing or abnormal color, but it is ok for LCD
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SIS 630S Chipset
No
Yes
Re-soldering
No
No
Monitor No Display
Try another known good monitor
Display Ok?
Chapter 5 Troubleshooting Guidelines
Yes
Replace faulty monitor
Setup Ok?
Yes
Replace motherboard
Board level Troubleshooting
Yes
Check VGA port signal
using oscilloscope
Correct it
End
Replace SIS 630 S
5.5 Memory test error
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