Chapter 4. Troubleshooting Table Troubleshooting Table - Sharp LC-52D43U - 52" LCD TV Service Manual

LC-52D43U
CHAPTER 4.
LC52D43U
TROUBLESHOOTING TABLE
[1] TROUBLESHOOTING TABLE
No audio output during UHF/VHF reception
Is SIF output from the tuner (TU1101_Pin15) normal?
Is input signal fed to pin 21 of IC1401 (SIF Demodulator) normal?
Are audio signals from pins 29 and 30 of IC1401 to pins 51 and
52 of IC1404 (CODEC) normal?
Are audio outputs of pins 38 and 39 of IC1404 normal?
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 TERMINAL_UNIT and around
the speakers.
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 (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 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.
4 – 1
YES