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Only for training and service purposes
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4. TROUBLE SHOOTING
4.5.2 Touch Screen Trouble
Touch screen works well?
Finish
START
Yes
Reboot the phone
Perform Touch Calibration
No
Touch screen works well?
Finish
Yes
No
Check connector.
CN400, CN901
Re-assemble or Re-solder.
Touch screen works well?
Finish
Yes
No
1
Check U404, U405, U406
and peripheral circuit.
Re-solder U404, U405, U406
and peripheral circuit.
Touch screen works well?
Finish
Yes
No
2
Change main board
Touch screen works well?
Finish
Yes
No
Change touch window
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