Read Sharp LC-46XL2E (serv.man4) Service Manual online
LC-42XL2E/S/RU, LC-46XL2E/S/RU, LC-46X20E/S/RU, LC-52XL2E/S/RU, LC-52X20E/S/RU
4 – 6
The audio signal is not output (1)
The audio signal of UHF/VHF and DTV is not output from EXT1 (SCART).
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART1
(SC502)?
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART1
(SC502)?
YES
Check the connection to SCART1 and external devices.
NO
Is S-MUTE-LINE [MAIN_UNIT pin (93) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S-MUTE_LINE.
(Q502, Q504, etc.)
(Q502, Q504, etc.)
NO
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402
(SOUND MULTIPLEX DECODER)?
(SOUND MULTIPLEX DECODER)?
YES
Check the line between SC502 and IC1402.
(Q508, Q507, IC1407, etc.)
(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 (SCART).
TEREMINAL UNIT:
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
Is audio signal sent to pins (3/L-ch) and (1/R-ch) of SCART2
(SC503)?
YES
Check the connection to SCART2 and external devices.
NO
Is S2-MUTE-LINE [MAIN_UNIT pin (91) of IC9101 (CPLD)] at H?
YES
Check the peripheral circuits of IC9101 and S2-MUTE_LINE.
(Q501, Q503, etc.)
(Q501, Q503, etc.)
NO
Is audio signal sent to pins (3/L-ch) and (13/R-ch) of IC7510
(SW)?
(SW)?
YES
Check the line between IC7510 and SC503.
(Q506, Q505, etc.)
(Q506, Q505, etc.)
NO
Is audio signal input to pins (2/L-ch) and (15/R-ch) of IC7510?
YES
Check IC7510 or peripheral circuits.
(SC_AUD_SEL_LINE, etc.)
(SC_AUD_SEL_LINE, etc.)
NO
Is audio signal sent to pins (24/L-ch) and (22/R-ch) of IC1402
(SOUND MULTIPLEX DECODER)?
(SOUND MULTIPLEX DECODER)?
YES
Check the line between IC7510 and IC1402.
(IC1407, etc.)
(IC1407, etc.)
NO
Check IC1402 and its peripheral circuits.
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