(AVC System)
No sound comes external input. (Sounds come out at the time of TV broadcast receiving.)
LC-37AD1E
headphones. monitor INPUT1 terminal. No sound comes out from the INPUT2 and 3 terminals.
Perform checking pins (25) and (24) of Is the audio output from IC1301 (AV SWITCH) IC2501(DACA L/R) to L.P.F (IC2506), H/P AMP normal? (IC2502) audio mute (Q2501) around Pins (43) and (45) of IC1301 (SC1 TV SUB the headphone terminal (J2402). OUT L/R) Is audio from the monitor output NO set to "Variable"? Are the headphones connected? Is the audio output from IC2501 (MULTI SOUND PROCESSOR) normal? Pins (37) and (36) of IC2501 (SC1 OUT L/R)
YES Perform checking from pins (37) and (36) of IC2501 to pins (3) and (1) of SC1101 (IC2506, Q2517 Q2516) and check the the audio mute circuit (Q1107, Q1104, Q1112 YES audio mute circuit (Q1102 and Q1101). and Q1109).
Check headphone mute circuit. Is the audio output from IC2501 (MULTI Perform checking from pins (43) and (45) of (Check the peripheral circuitry D2501, SOUND PROCESSOR) normal? IC1301 to pins (3), (1), (24) and (22) of SC1102 Q2501 IC2502.) Pins (34) and (33) of IC2501 (SC2 OUT L/R) (Q1106, Q1105, Q1111 Q1110) and check
Check the headphone plug circuit. Perform checking from pins (34) and (33) of Perform checking from pin (4) headphone IC2501 to pins (10) and (6) of the monitor (J2402) to pin (77) of IC2501. output terminal (J1101-) (IC2507, Q2503, YES Q2502, Q1115 Q1114) and check the audio mute circuit (Q1116 and Q1117).
Check or replace the peripheral circuitry of IC2501.
receiving. input.) No sound comes external input and PC input. (Sounds come out at the time of TV broadcast receiving.)
DTV No sound comes out at time UHF/VHF receiving. NO Is signal to Are the audio input circuits of IC1301 (AV SWITCH) normal? <INPUT1> Perform checking from pins (6) and (2) of SC1101 Is the input signal to pin (67) (SOUND IF1) and pin (69) (SOUND IF2) of IC2501 (MULTI SOUND PROCESSOR) normal? Pins IC1301 to pins (9) and (11) (L/R VIDEO2) of IC1301. <INPUT3> Perform checking from pins (27) and (23) of SC1102
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NO <PC SOUND INPUT> Perform checking from pins (2) and (3) of J2403 to Pins IC1301(L/R pins (29) and (31) (L/R PC-IN) of IC1301. Is SIF output from the tuner normal? (Pin (21) of TU1101) YES NO output from IC1301 (AV YES Is the audio input signal to IC2501 (MULTI SOUND PROCESSOR) normal? Check TU1101 (U/V tuner) and the parts around it. NO YES PROCESSOR) and the peripheral circuitry. IC1301 (AV SWITCH) and the Check IC2501 (MULTI SOUND Is I2S_DAOUT signal input normally from pin Check if the I2S_DAOUT, I2S_CL, I2S_WS (6) of (MULTI SOUND PROCESSOR) to and I2S_DAIN signals are output from IC2501 Check IC2501 (MULTI SOUND PROCESSOR) and the peripheral circuitry.
YES Pins IC1301 to pins (2) and (4) (L/R VIDEO1) of IC1301. Is the input signal to pins (59) and (61) of IC1301 (AV SW) normal? <INPUT2> Perform checking from pins (6) and (2) of SC1102
NO
Pins IC1301(L/R to pins (16) and (18) (L/R VIDEO3) of IC1301. Perform checking from pins (10) and (9) of Is the input signal to pin (67) (SOUND IF1) P2503 to pins (59) (61) IC1301 (AV and pin (69) (SOUND IF2) of IC2501 <INPUT4> Perform checking from pins (5) and (7) of J2404 to SW). (MULTI SOUND PROCESSOR) normal? Pins IC1301(L/R pins (23) and (25) (L/R VIDEO4) of IC1301.
YES SWITCH) normal?
NO
pin (60) (12SDA1) of IC2510? and input to IC2510 (DSP) normally.
YES
NO Is the audio output from IC2501 (MULTI SOUND PROCESSOR) normal? Pins (28) and (27) (DAC_M L/R) of IC2504
YES
Is audio output from pins (7) and (1) NO Check the peripheral circuitry of IC2504 IC2504 FIL) normal? (ACTIV FIL).
YES
Check the display side.
