19″ LCD Color Monitor Casper 19CSPR
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8. Maintainability
8.1 Equipments and Tools Requirement
1. Voltmeter.
2. Oscilloscope.
3. Pattern Generator.
4. DDC Tool with an IBM Compatible Computer.
5. Alignment Tool.
6. LCD Color Analyzer.
7. Service Manual.
8. User Manual.
8.2 Trouble Shooting
8.2.1 Main Board
No power
No power
Press power key and look if the
picture is normal
Please reinsert and make sure the
AC of 100V-240V is normal
Reinsert or check the
power section
Check if X401 oscillate
waveforms are normal
Check C423(+) =1.8V
U404 Vout=3.3V
OK
OK
NG
NG
NG
Check CN404 or replace Q409,
Q410, and U404
Replace U401
Replace X401
NG
OK