LG -T500 Service Manual page 109

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