LG KS20 Operating Instructions Manual page 111

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Only for training and service purposes
Start
Check the pin and battery
Connect terminals of I/O
connector
Connection OK?
Yes
Is the TA (or USB Cable)
voltage 4.8V (or 5.0V)?
Yes
Is it charging properly
After turning on U302, U300
NO
Check an U100 SMT status
by X-ray
Exchange U100 or
Change the Main board
And Retest
[ Charger Troubleshooting Flow ]
- 113 -
4. TROUBLE SHOOTING
NO
Change I/O connector
NO
Change TA
(or USB Cable)
Yes
END
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