Tuner Function Check - LG FA162 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART

7. TUNER FUNCTION CHECK

Tuner function check
Check
tuner module (TU100)
operation.
YES
Check IC201
CS5346 Pin21, 22 input
waveform.
YES
Check IC201
CS5346 Pin42, 43 output
waveform.
YES
Check IC201
Pin41 SDOUT.
YES
OK
NO
Check tuner module power
(Pin6 3.3 V).
Check
NO
L201, L202, C221, C226,
R242, R243.
Replace the related part.
Check IC201
NO
Pin14: 5 V,
Pin5, 36, 46: 3.3 V
Replace the related part.
NO
Check IC201.
3-12
NO
NO
YES
NO
YES
Check IC104 Pin3.
NO
Check SMPS.
Check μ-com (IC100)
Pin3, 69 communication.
Refer to SMPS troubleshooting.