LG HX966TZ Service Manual page 118

ELECTRICAL TROUBLESHOOTING GUIDE
8. TOUCH TROUBLESHOOTING
No power-touch operation
YES
Is FFC cable
connected properly?
YES
IC3P1
pin28 Vcc 3.3 V
OK?
YES
IC3P1
pin14 high
OK?
YES
R3P7 10 kΩ OK?
YES
Check IC3P1 or replace.
NO
Check FFC cable from POWER TOUCH
to FUNCTION TOUCH board.
Check harness cable
NO
from FRONT to FUNCTION TOUCH board.
Check 3.3 V ripple.
NO
Check harness cable
from FRONT to FUNCTION TOUCH board.
NO
Replace R3P7.
2-105