Sharp TU-45GAD, Service Manual

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40
TU-GD10U-T
TU-45GAD/T
LC-45GX6U/D/T
TROUBLE SHOOTING TABLE
(Continued)
No sound comes out. (2)
No sound comes out at BS reception.
No sound comes out at UHF/VHF
reception.
Is the input signal to pin (3) of
IC3805/3812 normal?
If the monitor output in the main menu
is set to "Variable", change to "Fixed".
Check between pins (9) and (7) (L/R
OUT) of P1105 and pins (3) of
IC3805/3812.
Does the volume icon select
"speaker" when operating the volume
key?
Is input signal to pin (67) (SOUND
IF1) of IC2501
(MULTISOUNDPROCESSOR)
normal?
Check the "HP-PLUG" signal Line.
Check Pin (4) of Headphone (J2402)
thru Pin (7) of IC1102.
Is SIF output from the tuner normal?
(Pin (14) of TU1101)
Is input signal between pin (3)
(MAINL/R) of IC3805/3812 and pins
(56) and (57) of IC2501
(MULTISOUNDPROCESSOR)
normal?
Is each signal (I2S/LRCK, BICK,
SDTO and SDTI) input/output from
IC2702 to IC2700 (DSP)?
Check TU1101 (UV tuner) and its
peripheral circuits.
Is audio output between pins (33) and
(34) (SC2_OUT_L/R) of IC2501
(MULTISOUNDPROCESSOR) and
pins (32) and (33) of IC2702 normal?
Check between pins (33) and (34)
(SC2_OUT_L/R) of IC2501
(MULTISOUNDPROCESSOR) and
pin (32) and (33) of IC2702.
Is each audio output from pins (28)
and (29) of IC2702 normal?
(AOUT_L/R)
Check IC2702 and its peripheral
circuits.
Is audio output between pins (28) and
(29) of IC2702 and pins (13) and (15)
of P3801 (1-bit amplifier input)
normal?
Check the circuits between pins (28)
and (29) of IC2702 and pins (13) and
(15) of P3801 (1-bit amplifier input).
Is the relay normally switched from
P6003 of AUDIOIF PWB to RY6001
(speaker switching) or RY6000
(speaker A/B switching)?
Check1-Bit Amp. and its peripheral
circuits.
Does the volume icon select
"speaker" when operating the volume
key?