LG D337 - Touch Sensor Trouble Shooting

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3.15. Touch Sensor Trouble Shooting
Touch Woks OK ?
Check Power
+1V8_MTK_VIO (TP1) /
+3V0_TOUCH_VDD(TP2)
Power is OK?
Check I2C Line & Signal
Line (TP3, TP4)
Touch Works OK?
Change Touch Module
Touch Works OK?
START
END
Reconnect Touch Module connector
(CN7200)
Change MT6323(U4100)
Change Main Board
No
No
No
No
Yes
Yes
Yes
Yes