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LGE Internal Use Only
Copyright © 011 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
CHECKING FLOW
Yes
Yes
Yes
No
No
Check CN404 and
touch panel
contact
Check touch signal
ZD402~405 (TP05~08)
Resolder or Replace
U402
Contact well CN404
and touch panel
Check supply voltage of U402
C417 (TP01)
Touch will work
properly
START
Yes
Resolder or Replace
U201
Check I2C signal of U201
R229, R230 (TP03~04)
Resolder CN404 or
replace touch panel
Yes