Sharp Aquos LC 37HV6U, Service Manual

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44
LC-37HV6U
YES YES
YES YES
NO NO NO NO
No sound comes out. (Sounds come out at the time of TV broadcast receiving.)
No sound comes out from the headphones.
Check or replace the peripheral circuitry of IC2501.
No sound comes out from the monitor
Perform checking from pins (25) and (24) of IC2501 to L.P.F (IC2506), H/P AMP (IC2502) and audio mute (Q2501) and around the headphone terminal. Are they all as specified?
Is the audio output from the monitor output set to "Variable"? Are the headphones connected?
Check the headphone mute circuit. (Check the peripheral circuitry of D2501, Q2501 and IC2502.)
Is the audio output from IC2501 (MULTI SOUND PROCESSOR) normal? Pins (34) and (33) of IC2501 (SC2 OUT L/R)
Check the headphone plug circuit. Perform checking from pin (6) of headphone (J2402) to pin (30) of IC1601. Are they all as specified?
Perform checking from pins (34) and (33) of IC2501 to pins (16) and (10) of the monitor output terminal (J1104). Check IC2504, Q2503 and Q2502 as well as audio mute circuit (Q1103 and Q1102).
NO YES
YES YES YES YES
NO NO NO
No sound comes out at the time of TV broadcast receiving. (Sounds come out at the time of external input.)
No sound comes out at the time of UHF/VHF receiving.
Is the input signal to pin (67) (SOUND 1F1) and pin (69) (SOUND 1F2) of IC2501 (MULTI SOUND PROCESSOR) normal?
Check B.P.F. of SIF1 and SIF2. Are they all as specified? Is the SIF output from the tuner normal? (Pin (7) of TU1101 and pin (7) of TU1102) Check TU1101 and TU1102 (U/V tuner) and the parts around them.
Is the I2S_DAOUT signal inputted normally from pin (6) of IC2501 (MULTI SOUND PROCESSOR) to pin (25) (SDI0) of IC2518?
Check if the I2S_DAOUT, I2S_CL, I2S_WS and I2S_DAIN signals are outputted from IC2501 and inputted to IC2518 (DSP).
Is the audio output from IC2501 (MULTI SOUND PROCESSOR) normal? Pins (28) and (27) (DAC_M L/R) of IC2501
Check IC2501 (MULTI SOUND PROCESSOR) and the peripheral circuitry.
Is the audio output from pins (7) and (1) of IC2505 (OP_AMP) normal?
Check the display side.
Check the peripheral circuitry of IC2505 (OP_AMP).
NO YES
YES
No sound comes out at the time of external input and PC input. (Sounds come out at the time of TV broadcast receiving.)
Is the audio input signal to IC1301 (AV SWITCH) normal? <INPUT1> Pin(24) fo IC1301 (L/R VIDEO1) <INPUT2> Pin(9) and (11) IC1301 (L/R VIDEO2) <INPUT3> Pin(16) and (18) IC1301 (L/R VIDEO3 <INPUT4> Pin(23) and (25) IC1301 (L/R VIDEO4) <PC SOUND INPUT> Pin(29) and (31) IC1301 (L/R PC-IN) Check IC1301 (AV SWITCH) and the peripheral circuitry.
Check IC2501 (MULTI SOUND PROCESSOR) and the peripheral circuitry.
Are the audio input circuits of IC1301 (AV SWITCH) normal? Perform checking from pins (18) and (12) of J1103 to pins (2) and (4) (L/R VIDEO1) of IC1301. Perform checking from pins (16) and (10) of J1103 to pins (9) and (11) (L/R VIDEO2) of IC1301. Perform checking from pins (18) and (12) of J1104 to pins (16) and (18) (L/R VIDEO3) of IC1301. Perform checking from pins (5) and (7) of J2404 to pins (23) and (25) (L/R VIDEO4) of IC1301. Perform checking from pins (2) and (3) of J2403 to pins (29) and (31) (L/R PC-IN) of IC1301.
Is the audio output signal from IC1301 (AV SWITCH) normal? Pins (52) and (54) of IC1301 (LOUT1/ROUT1)
Is the audio input signal from IC2501(MULTI SOUND PROCESSOR) normal? Pin(56) and (57) of IC2501(SC1INL/R)
AVC System