LG GD580 - Key and Touch Screen Trouble

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Only for training and service purposes
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4. Trouble Shooting
4.5 Key and Touch Screen Trouble
4.5.1 Key Trouble
y
Trouble
Key works well?
START
Yes
Press the key button
No
Change the key FPCB.
Finish
Change Main Board
Check key button.
If Key button is pressed or
appearance is abnormal,
Change the key button.
works well?
Yes
Finish
No
Check BtoB connector(CN100)
Re-assemble CN100.
Check connector soldering.
Re-solder CN100.
works well?
Yes
Finish
No
works well?
Yes
Finish
No
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