LG -T370 Service Manual page 99

Check supply voltage of U40
LGE Internal Use Only
START
C417 (TP1)
Check IC signal of U01
R9, R30 (TP3~4)
Yes
Check touch signal
ZD40~405 (TP5~8)
Yes
Check CN404 and
touch panel
contact
Yes
Resolder CN404 or
replace touch panel
Yes
Touch will work
properly
No
Resolder or Replace
U01
No
Resolder or Replace
U40
No
Contact well CN404 and
touch panel
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4. TROUBLE SHOOTING
Only for training and service purposes