Sharp LC-40LE820E Service Manual page 63

Is the audio signal output to pins (1) of sound output terminal
(D520)?
Is SPDIF_MUTE signal SPDIF_MUTE [H29/IC3302] or
MUTE_A_ALL [21pin of IC2002 (UCOM)] at "H"?
Is an audio signal input to pin (2) of IC503 from
[J28/SPDIF_OUT] of IC3302 and is the logic signal input into pin
(1) of IC503?
Check IC3302 and its peripheral circuits.
Is the audio signal output to pins (14) of SC1503 (HDMI1 termi-
nal)?
Is the audio signal output to pins (8) (10) (12) of IC1508?
Is the audio signal input to pins (9) (11) (13) of IC1508?
Is the audio signal output to pins (6) of IC1508?
Is the audio signal input to pins (5) of IC1508?
Is the audio signal output to pins (4) of IC1505?
Is SPDIF_MUTE signal ARC_MUTE [AK2/IC3302] or
MUTE_A_ALL [21pin of IC2002 (UCOM)] at "H"?
Is an audio signal input to pin (2) of IC1505 from
[J28/SPDIF_OUT] of IC3302 and is the logic signal input into pin
(1) of IC1505?
Check IC3302 and its peripheral circuits.
No sound from external output device (3)
No sound from DIGITAL AUDIO OUTPUT terminal.
NO
NO
NO
No sound from external output device (4)
Does not the sound of the audio signal output to HDMI1 go out?
NO
NO
NO
NO
NO
NO
YES Check D520 and peripheral circuits.
YES Check the peripheral circuits of IC3302 and SPDIF_MUTE.
(Q505, D530, etc.)
YES Check the IC503 and peripheral circuits.
YES Check SC1503 and peripheral circuits.
YES Check the line between SC1503 and IC1508.
YES Check SC1508 and peripheral circuits.
YES Check the line between IC1508 and IC1505.
YES Check the peripheral circuits of IC3302 and ARC_MUTE.
(Q1501, D1513, etc.)
YES Check the IC1505 and peripheral circuits.
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LC-40/46/52LE820E (1st Edition)