U503 Troubleshooting; Tu501 Fm Tuner Module - LG XA64 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

9. U503 TROUBLESHOOTING

U503 troubleshooting
Check
the power supply to
U503 pin24
YES
Check
the SCL/SDA data of U503
pin25, 26
YES
Check the control function
YES
OK

10. TU501 FM TUNER MODULE

TU501 FM tuner module
Check
the power supply of TU101
pin3
YES
Check TU-SCL, TU-SDA
YES
Check the operation
YES
OK
NO
Refer to power troubleshooting
NO
Check JK501 pin47, 48 Vol_CLK/Vol_Data
NO
Check or replace U503
NO
Check Q508 B "High"
NO
JK600 pin20, 21
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