LC-46X8E (serv.man8). Troubleshooting Table - Sharp TV Parts Guide (repair manual). Page 6

Read Sharp LC-46X8E (serv.man8) Parts Guide online

LC-46X8E/S/RU
4 – 6
The audio signal is not output (1)
                                             
The audio signal of UHF/VHF and DTV is not output from EXT1 (SCART1).
TERMINAL UNIT:                 
Is audio signal (L/R) output from pins (3, 1) of SCART1 (SC502)?
YES
Check the connection to SCART1 and external devices.
NO
Is S-MUTE signal [MAIN_UNIT pin (93) of IC9101 (CPLD)] at H?
YES
This signal should be “L”.
Check the peripheral circuits of IC9101 and S-MUTE signal.
(Q502, Q504, etc.)
NO
Is audio signal (L/R) output from pins (24, 22) of IC1402 (SOUND 
MULTIPLEX DECODER)?
YES
Check the line between SC502 and IC1402.
(Q508, Q507, IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
The audio signal is not output (2)
                                             
The audio signal of UHF/VHF and DTV is not output from EXT2 (SCART2). 
TERMINAL UNIT:                 
Is audio signal (L/R) output from pins (3, 1) of SCART2 (SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE signal [MAIN_UNIT pin (91) of IC9101 (CPLD)] at 
H?
YES
This signal should be “L”.
Check the peripheral circuits of IC9101 and S2-MUTE signal.
(Q501, Q503, etc.)
NO
Is audio signal (L/R) output from pins (3, 13) of IC7510 (SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
NO
Is audio signal (L/R) input to pins (2, 15) of IC7510 (SW)?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL signal, etc.)
NO
Is audio signal (L/R) output from pins (24, 22) of IC1402 (SOUND 
MULTIPLEX DECODER)?
YES
Check the line between IC7510 and IC1402.
(IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.

Display

Click on the first or last page to see other LC-46X8E (serv.man8) service manuals if exist.

Random: