LG LG-P715 - Touch Key Trouble

4. TROUBLE SHOOTING
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4.17 Touch Key Trouble
Front 2 Keys consist of Menu and Back.
Front 2 Key signals are generated by touch sensor. Those signal’s path is :
Touch window -> Touch Sensor -> MSM8225
No
No
No
No
Disconnect and reconnect
Touch sensor connector
Change the upper assy.
[Touch Module]
Reball or change U4007,C4051
Change the Main BD
The touch key works
Touch key sensing OK?
Check VREG_TOUCH_3.0V
(TP1) is OK?
Touch key sensing OK?
Touch key sensing OK?
Yes
Yes
Yes
Yes
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