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CHAPTER 6.
LC-32D42U/LC-37D42U
TROUBLE SHOOTING TABLE
[1] TROUBLE SHOOTING TABLE
No audio output during UHF/VHF reception
Is SIF output from the tuner (TU1101_Pin15) normal?
Is input signal fed to pin 21 (SOUNDIF 1) of IC1401 (SIF Demod-
ulator) normal?
Are audio signals from pins 29 and 30 (SC2_OUTL/R) of IC1401
to pins 51 and 52 of IC1404 (CODEC) normal?
Are audio outputs (A-OUT_L/R) of pins 38 and 39 of IC1404 nor-
mal?
Is audio input from pins 38 and 39 of IC1404 to pins 3 and 5 of
IC2701(STEREO_AMP) normal?
Is audio output from IC2701 normal?
Check the connector (P2703) of AV_UNIT and around the speak-
ers.
No monitor audio output
Is monitor audio output set to "Variable"?
Are audio output pins 40 and 41 of IC1404 (CODEC) normal?
Are audio output pins 7 and 1 of IC1408 (Buffer_AMP) normal?
Check between IC1408 and MONITOR OUTPUT terminal (J501,
J502).
YES
YES
YES
YES
YES
YES
NO
YES
YES
Service Manual
NO
Check the tuner and peripheral circuits.
NO
Check the filter circuits (Q1102-3) and peripheral circuits.
NO
Check between pins 29 and 30 (SC2_OUTL/R) of IC1401 and
pins 51 and 52 of IC1404 (CODEC).
Are the DSP_LRCK, DSP_BCKIN, DSP_SDIN1, DSP_MCLK,
NO
DSP_SDOUT1, DSP_SDOUT2 signals sent from IC1404 to
IC1407 (DSP) normally?
Check IC1404 and peripheral circuits.
NO
Check the circuits between pins 38 and 39 of IC1404 and pins 3
and 5 of IC2701. (MUTE circuits: Q1307, Q1314, Q1313)
NO
Check IC2701 and peripheral circuits.
YES
Reset monitor audio output to "Fixed".
NO
Check IC1404 and peripheral circuits.
NO
Check IC1408 and peripheral circuits.
6 – 1
LC-32D42U/LC-37D42U
YES
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