LC-52SB55U
6 – 11
No audio (3)
No audio at UHF/VHF broadcast signal reception. No audio at digital broadcast signal reception.
Is TV selected on the input select menu screen? Is TV selected on the input select menu screen?
YES
NO
YES
NO
Is the audio output selected for “VARIABLE” on the menu
screen?
Is the audio output selected for “VARIABLE” on the
menu screen?
Set the audio output to “FIXED”. Set the audio output to “FIXED”.
Is there the SIF signal output at pin(15) of tuner(TU1101)? Are there the video signal outputs (IF_P/N) at the pins(19) and (20)
of tuner(TU1101)?
YES
NO
YES
NO
Check the tuner(TU1101) and its peripheral circuits. Check TU1101 and its peripheral circuits. (SDA3/
SCL3, etc.)
Does the SIF signal come from pin(15) of tuner(TU1101) to pin(AN23) of
IC8001(CPU)?
Are there the video signal inputs at pin(AM33) and (AM34) of
IC8001(CPU)?
YES
NO
YES
NO
Check the line between TU1101 and IC8001, and their
peripheral circuits. (Q1101, Q1102, etc.)
Check the line between TU1101 and IC8001, and
their peripheral circuits. (L1101, C1103, etc.)
Does the audio signal come from pins(AP28/AN28)(SPOUT_LN/P), and (AN29/AP29) to pins(6/5)(INLM/INLP), and (8/9)(INRM/INRP) of
IC2701(AMP)?
YES
NO
Check the line between IC8001 and IC2701, and
their peripheral circuits. (Q1306 thru Q1308,
AMP_MUTE line, etc.)
Is the audio output from IC2701 as specified? NO Check IC2701 and its peripheral circuits.
YES
Check the connector(P2701), speakers and their peripheral circuits.
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