LG 22LG3000 Service Manual page 24

2. No Display
Check the source
Check LVDS cable
Check 12V power supply
Check main board power
Check I
3. Can't start (LED indicator Blank)
Can't start
Check keyboard
OK
Check 5V_SB
OK
2
Check I C communication
OK
Check oscillistor
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No display
NG
OK
NG
OK
OK
OK
NG
Check U404
OK
2
C communication
OK
NG
Check panel
NG
NG
NG
Reset source
Replace LVDS cable
NG
Return to "1"
Replace U404
NG
2
Repair I C communication relative circuit
Replace panel
Repair the keyboard
Check every chip power supply
2
Replace I C communication component
NG
Replace oscillistor
- 24 - LGE Internal Use Only