FSC P20W-5, Service Manual

Page: 35 / 79

20
"
&22
"
LCD Color Monitor FSC P20W-5&P22W-5
- 35 -
8. Maintainability
8.1 Equipment and Tools Requirement
1
、
Voltmeter.
2.
、
Oscilloscope.
3
、
Pattern Generator.
4
、
DDC Tool with 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 100-240 is normal
Measure U707 PIN2=3.3V
U705 PIN 2=1.8V; U704 PIN 2=2.5V
Reinsert or check the
Adapter/Inverter
section
X401 ， X402 oscillate
waveforms are normal
Check CN701 or replace
U707, U705 and U704
Check U402
Replace X401, X402
OK
OK
OK
NG
OK
NG
NG
Replace U402
Replace U401
OK
NG