Only For Training And Service Purposes - LG GM750 Service Manual

4. TROUBLE SHOOTING
LGE Internal Use Only
Start
Check the pin and battery
Connect terminals of I/O
connector
Connection OK?
Yes
Is the u- USB Cable) voltage
4.8V (or 5.0V)?
Yes
Is it charging
properly
After turning on
Q401, U404
NO
Check an U201 SMT status
by X-ray
Exchange U201 or
Change the Main board
And Retest
[ Charger Troubleshooting Flow ]
- 120 -
NO
Change I/O connector
NO
Change TA
(or u-USB Cable)
Yes
END
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Only for training and service purposes