Sharp LC-32HT2U Service Manual page 35

No audio output during UHF/VHF reception
Is Video output during UHF/VHF reception normal?
Is SIF output from the tuner (TU1101_Pin3) 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 IC1403 (CODEC) normal?
Are audio outputs (A-OUT_L/R) of pins 38 and 39 of IC1403 nor-
mal?
Is audio input from pins 38 and 39 of IC1403 to pins 11 and 15 of
IC2701(STEREO_AMP) normal?
Is audio output from IC2701 normal?
Is the speaker switching circuit (T2701) normal?
Check the connector (P2703) of IF_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 IC1403 (CODEC) normal?
Are audio output pins 7 and 1 of IC1407 (Buffer_AMP) normal?
Check between IC1407 and MONITOR OUTPUT terminal (pins
10 and 16 of J502).
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
NO Check the tuner and RF-SW (UNT 501).
NO Check the tuner and peripheral circuits.
NO Check the filter circuits (CF1101-3 and Q1102-3) and peripheral
circuits.
NO Check between pins 29 and 30 (SC2_OUTL/R) of IC1401 and
pins 51 and 52 of IC1403 (CODEC).
NO Are the LRCK, BICK, SDTO and SDTI signals sent from IC1403
to IC1406 (DSP) normally?
Check IC1403 and peripheral circuits.
NO Check the circuits between pins 38 and 39 of IC1403 and pins 11
and 15 of IC2701. (MUTE circuits: Q1306-8)
NO Check IC2701 and peripheral circuits.
YES Reset monitor audio output to "Fixed".
NO Check IC1403 and peripheral circuits.
NO Check IC1407 and peripheral circuits.
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LC-32HT2U
YES