46
LC-60LE635
LC-60LE638
Troubleshooting Table (continued)
No sound from external output device (3)
No sound from DIGITAL AUDIO OUTPUT terminal.
Does audio signal output from pin [1] of sound output terminal
(D527)?
YES Check D527 and peripheral circuits.
NO
Does audio signal output from pin [4] of IC503? YES Check the line between IC503 and D527.
NO
Is AUDIO_MUTE (MUTE_A_ALL) [23 pin] of IC2001 (UCOM) at
“H”?
YES Check the peripheral circuits of IC503 and AUDIO_MUTE (Q505
etc...).
NO
Does audio signal input to pin [2] of IC503? YES Check IC503 and peripheral circuits.
NO
Does audio signal (OPT_OUT) output from pin [AA31/
CPU_ASPDIF] of IC3303 (Digital AV decode & Main CPU)?
YES Check the line between IC3303 and IC503.
NO
Check IC3303 and its peripheral circuits.
No sound from external output device (4)
Does not the sound of the audio signal output to HDMI1 go out?
Does audio signal output from pin [14] of SC1503 (HDMI1 termi-
nal)?
YES Check SC1503 and peripheral circuits.
NO
Does audio signal output from pin [39/HECP] of IC1504 (HDMI-
SW)?
YES Check the line between SC1504 and SC1503.
NO
Does audio signal input to pin [36/SPDIF_IN] of IC1504? YES Check IC1504 and peripheral circuits.
NO
Does audio signal (HDMI_OPT_OUT) output from pin [AA31/
CPU_ASPDIF] of IC3303 (Digital AV decode & Main CPU)?
YES Check the line between IC3303 and IC1504.
NO
Check IC3303 and its peripheral circuits.
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