Touch Pad Check - LG FA162 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART

3. TOUCH PAD CHECK

Touch pad check
Check IC304
Pin24 3.3 V.
YES
Check
IC304 Pin1: SDA, Pin2: SCL
IC101 Pin27: DATA, Pin28 : CLK
IC100 Pin5: CLK, Pin23: DATA
YES
OK
NO
PN302 Pin5 3.3 V.
OK
Check
NO
resistance output of line
CLK : R358
DATA : R351
OK
3-8
NO
YES
NO
YES
Check IC104 output Pin3 : 3.3 V
Check IC104 input Pin2 : 3.7 VA
IF it is right --> OK
IF it is NO --> Refer to SMPS
Troubleshooting.
Replace the related part.