Table of Contents
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4. TROUBLE SHOOTING
4.6 Touch Screen
Touch communication path is DB3200 – level shifter – Touch driver IC – panel.
Therefore if the problem happens, should check all path.
Main PCB problem
Check Touch driver IC(U703) and level shifter(U702)
Touch works well?
Change Main PCB
LGE Internal Use Only
Press Touch panel
Touch works well?
Change main PCB
Yes
Touch works well?
Yes
No
START
Yes
No
No
Check FPCB connectors
Yes
Finish
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Finish
Touch panel problem
Touch works well?
No
Change Touch panel
Only for training and service purposes
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Table of Contents
Troubleshooting
