LG FLATRON L1780Q

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TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
CHECK POWER
ADAPTER
CHECK
J609 1,2,3 PIN
12V?
NO
CHECK U801 IC
U801 PIN 3
5V?
NO
CHECK DATA LINE
CONNECTION
U402 PIN-3
1.8V?
NO
YES
YES
NO PROBLEM
YES
CHECK U201
VCC,XTAL,RESET
1 2
WAVE FORM
J609-#1,2,3 U401-#3
3
U402-#3
1
3
CHECK U401
U401 PIN 3
3.3V?
NO
2