Sharp Aquos LC-32GD4U, Service Manual

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43
LC-32GD4U
LC-37GD4U
TROUBLE SHOOTING TABLE
(Continued)
YES YES YES
YES YES YES
YES YES
NO
NO NO
NO NO NO
No sound comes out.
(3)
No sound comes out at digital broadcast reception.
No sound comes out from the headphones.
Check IC2702 and its peripheral circuits. Check the mute control terminal pin (2) of IC2502.H:
Active, L: Mute
Are audio output pins (26) and (27) of IC2702 (DIR) as specified? Are audio output pins (1) and (7) of IC2502 (H/P_AMP) as specified? Check J2402 (HEAD_PHON_JACK) and its peripheral circuits.
Does IC5708 (AUD_AMP) function well?
Check the digital unit. Check IC5704 and its peripheral circuits. Check IC5708 and its peripheral circuits. Check the line from the connector (P5704) to IC5704 and their peripheral circuits.
Is the signal from the digital unit inputted to the connector (P5704) of
A
V_UNIT?
Are the analog-converted audio signals outputted to output terminal pins (1
1) and (8) of IC5704?
Are the audio signals inputted to IC3805 and pin (2) of IC3812? Are signals I2SLRCLK, I2CDA
T
A, I2SSCLK and
AUDMCLK inputted to the input terminals (pins (1) to (4)) of IC5704 (DAC)?
NO
NO NO
NO NO NO
YES YES YES YES YES
YES
YES
No sound comes out.
(2)
Are audio output pins (37) and (36) (SC1_OUT_L/R) of IC2501 (MUL
TI_SOUND_
PROCESSOR) as specified? Are audio output pins (7) and (1) of IC2504 (EQ_AMP) as specified? Are audio output pins (3) and (13) of IC1
108 as
specified? Check the line from IC1
108 to the MONIT
OR
OUTPUT
terminal.
Are the audio signals inputted to input terminal pins (2) and (5 ) and pins (14) and (15) of IC1
108
(AUDIO_SW)? No monitor audio output comes out. Is the monitor audio output set to anything other than "V
ariable"?
Are the headphones disconnected?
Check IC2501 and its peripheral circuits.
No audio output for digital recording comes out.
Check the digital unit. Check the line from P1
105 to IC1
108.
Is the audio signal from the digital unit inputted to the connectors (DA, P1
105) of
A
V_UNIT?
Are the audio signals inputted to input terminal pins (1) and (4) and pins (1
1) and (12) of IC1
108
(AUDIO_SW)?
Check IC2504 and its peripheral circuits. Check the line from IC2504 to IC1
108.
Check IC1
108 and its peripheral circuits.
Is the control signal inputted to pin (10) of IC1
108
as specified?
YES YES