LG LG-V909DW - 4.21 Touch trouble

4. TROUBLE SHOOTING
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4.21 Touch trouble
Touch control signals are generated by AP20. Those signal’s path are :
AP20 -> Touch Module
Measurement
V_TCH_3V3(TP1)
V_TCH_POWER(TP2)
Start
Start
End
Change the AP board
Change the touch module
End
Work Well?
Check Power
V_TCH_3V3(TP1)
V_TCH_POWER(TP2)
Touch is OK?
Yes
Yes
No
No
No
Yes