LG KF510C Service Manual page 99

5. Trouble shooting
START
Check Touch Signal
(If not rep lace front t ouch
panel) Ch eck TP1
U601 & U602 Solder
OK? Check TP2
Yes
FPCB i s Crack?
Repla cd Main Board
LGE Internal Use Only
U602 U601
No
Resolder it
No
Replace FPCB
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TP2
Only for training and service purposes