Touch Troubleshooting - LG -D618 Service Manual

3.12 Touch troubleshooting

Touch screen is a capacitive sensor with an attached flexible PCB.
Touch connector has control lines. (Touch IC is located on Touch Window module)
Touch control signals are generated by MSM8226.
Press PWR key to power on
Yes
Touch panel works well?
Yes
Another Touch Panel connect. Touch
Check touch power on main board.
If device's other function is normal, then
LGE Internal Use Only
START
No
works?
No
TP2(VREG_L28_2V95)
TP1(VREG_L6_1V8)
No
replace U4100
End
TP3, TP4 is 1.8V ?
Yes
And can you see when touch to
window, TP4 signal change high to
low?
Can you see I2C wave form?
@TP5, TP6?
Replace Touch Window module
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3. TROUBLE SHOOTING
Yes
No
Yes
No
Only for training and service purposes