Touch Key Block - LG HB954WA Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

5. TOUCH KEY BLOCK

Power on
Touch key 6EA
LED turn on?
YES
When you
touch keys, LED is
blinking?
YES
Touch Key operating OK
NO
CN3A1
connection OK?
YES
Touch Vcc
3.3V OK?
YES
LED
check OK?
YES
IC3A1
check OK?
YES
NO
2-34
NO
5P Harness cable connect
NO
I/F Junction &
SMPS Block check
NO
Replace LED
NO
Replace IC3A1