LG CU405 Service Manual page 89

4. TROUBLE SHOOTING
Troubleshooting Flow
Start
Check the pin and battery
Connect terminals of I/O
connector
Connection OK?
Yes
Is the TA voltage
4.6V?
Yes
Is it charging
properly
After turning on Q400,
Q401?
NO
Change the board
NO
Change I/O connector
NO
Change TA
Yes
END
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