Sharp LC-19S7E-BK, Service Manual

Page: 31 / 193

2008-03-14
LC-19S7E-BK LC-26S7E-BK LC-32S7E-BK
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No sound from external input devices (4)
↓
Does not the sound of the audio signal input to “AV side” go out?
MAIN UNIT:
↓
↓ YES
↓ YES
No sound from external input devices (5)
↓
Does not the sound of the audio signal input to HDMI go out?
↓
↓ YES
The audio signal is not output (1)
↓
The audio signal of UHF/VHF is not output from SCART1.
TEREMINAL UNIT:
↓
↓ NO
↓ NO
Is the audio signal properly sent to pin (4) (SIDE_AU_INL) and pin
(6) (SIDE_AU_INR) of CN1207?
NO
Check the connection to CN1207 and the external input device.
Refer to “ No sound output in all modes ” .
Is the audio signal properly sent to pin (77) (AUL3) and pin (78)
(AUR3) of IC U4201? NO Check the line between CN1207 and IC U4201.
Refer to “ No sound output in all modes ” .
Is picture of the signal input from HDMI displayed?
NO
Refer to “ Does not the picture of the HDMI signal input to HDMI
go out? ” .
Is audio signal output from IC U4201 pin(82)(SCAL) and pin(83)
(SCAR) sent to pin (13)(INL) and pin (15)(INR) of IC U1901?
Is audio signal output from IC U1901 sent to pin (3) (SCAUD_LOUT)
and pin(1)(SCRAUD_ROUT) of SCART1(CN1901)? YES Check the connection to SCART1 and external devices.
YES
Check the line between IC U4201 and IC U1901
Check IC U4201 and its peripheral circuits.