Sharp LC-46DH65E Service Manual page 39

No audio signal output from AUDIO_OUTPUT terminal.
Is audio signal (L/R) output to pins (2, 4) of AUDIO_OUTPUT ter-
minal (J503)?
MONITOR_MUTE signal [Pin(23) of IC503(AV_SW.)] or MUTE-
A_ALL signal[Pin(21) of IC2003] will be "H"?
Is audio signal (L/R) output to pins (5, 6) of IC1302 (DSP)?
Check IC1302 and its peripheral circuits.
No sound from HEADPHONE_OUTPUT terminal.
Is the HP_PLUG signal input to pin(90) of IC9101(CPLD) from
pin(6) of a HEADPHONE_OUTPUT terminal(J1302)?
Is the audio signal output (HP_L/R) to pins(2, 3) of HEADPHONE
terminal(J1302)?
Is HP-MUTE-LINE [pin(70) of IC19101(CPLD)] at H?
Is audio signal (HP_L/R) output to pins (40, 42) of IC1302
(DSP)?
Check IC1302 and its peripheral circuits.
The audio signal is not output (2)
NO
NO
NO
The audio signal is not output (3)
YES
NO
NO
NO
YES Check the connection to AUDIO_OUTPUT terminal and external
input devices.
YES Check the peripheral circuits of IC503 and MUTE-A_ALL_LINE.
(D534, etc.)
YES Check the line between IC1302 and J503.
(Q510, Q511, Q512, Q513, etc.)
NO Check the line between J1302 and IC9101.
(J1302, IC9101, etc.)
YES Check the HEADPHONE terminal(J1302) and/or peripheral cir-
cuits.
YES Check the peripheral circuits of IC9101 and HP-MUTE_LINE.
(Q1301, etc.)
YES Check the line between IC1302 and J1302. (IC1305, etc.)
4 – 5
LC-46DH65E/S, LC-46DH66E