Key Part - LG SL4Y Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

2. KEY PART

KEY PART
Check CN505 1, 2 pin
Voltage 3.3 V
Check SWA01, SWA02,
SWA03, SWA04
OK
YES
YES
YES
NO
Check the connecting cables
Check R520 Pull-up Resistor
Replace the Key PCB
NO
Check RA01, RA04, RA05, RA06
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3-23
Replace the Cable1
NO
YES
OK
Only for training and service purposes.