Sharp LC-50U35T, Service Manual

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LC50/58/65U35T
6 – 12
No audio (1)
Component/VIDEO No audio.
Is Component/VIDEO selected on the input select menu screen?
NO
Refer to "COMPONENT:No external input
video [Component/VIDEO]"
or "COMPOSITE:No external input video
[Component/VIDEO]".
YES
Is selecting "Fixed" of "Audio Out > Stereo Minijack > Output Select" on the setting
menu screen ? NO Set the audio output to "Fixed".
YES
Does the audio signal come from pins(2)(L) and (4)(R) of input terminal(J502) to
pins(C37)(L) and (A36)(R) of IC3303(CPU)? NO Check the line between J502 and IC3303.
YES
˜ About the L/R speakers.
Does the digital audio signal come from pins(AP36/AM31/AN30/ ˜ AN31)(SP_MCLK/
SP_BCLK/SP_LRCLK/SP_LR_DAT) of IC3303(CPU) to pins(5/6/7/8)(SP_MCLK/
SP_LR_DAT/SP_BCLK/SP_LRCLK) of IC1701(Audio AMP) ?
About the Subwoofer speaker.
Does the digital audio signal come from pins(AP36/AM31/AN30/AM30)(SP_MCLK/
SP_BCLK/SP_LRCLK/SP_WF_DAT) of IC3303(CPU) to pins(5/6/7/8)(SP_MCLK/
SP_WF_DAT/SP_BCLK/SP_LRCLK) of IC1801(Audio AMP) ?
NO
Check the line between IC3303 and IC1701 /
IC1801, and their paripheral circuits.
YES
˜
About the L/R Speakers.
Does the audio signal come from pins (10/14/26/30) of IC1701 (Audio AMP) to pin
(6/5/4/3) of P1702 (connector for speaker)?
˜ About the Subwoofer speaker.
Does the audio signal come from pins (10/14/26/30) of IC1801 (Audio AMP) to pin
(1/2) of P1702 (connector for speaker)?
NO
Check IC1701 / IC1801 and its paripheral cir-
cuits.
YES
˜ About the L/R Speakers.
Check the connector (P1702) L/R speakers and their peripheral circuits.
˜ About the Subwoofer Speaker.
Check the connector (P1702) L/R speakers and their peripheral circuits.