LC-32LE600E (serv.man7). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 6

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LC-32/40/46LE600E/RU/S
5 – 6
No sound (1-2) (during the reception of DTV broadcasting) 
No audio output during DTV 
reception
Checklist:
1) Is the volume set to MIN or MUTE on the remote control? 
••• Set the desired volume.
2) Is ANT-CABLE disconnected or connected improperly? 
••• Connect it correctly as per the operation manual.
3) Attention: The terminal of IC3303 (VCT) cannot be actually checked by hiding oneself, and check it with another terminal of the same line, 
please.
(MAIN-UNIT)
(TUNER SIDE)
Is the audio signal 
(AOUT_SP_L/R) output 
from pins (H26) and (H25) of 
IC3303 (VCT)?
NO
Is the digital IF signal 
(D_IF
±) input to pins 
(T25) (R25) of IC3303 
(VCT)?
YES
Check whether there 
are a power supply of 
IC3303 (VCT), the short 
circuit, and other abnor-
malities.
(MAIN-UNIT)
YES       (OUTPUT_SIDE)
NO
Is the audio signal 
(SPKOUT_L/R) output 
form pins (17) and (18) of 
IC1302 (A-SW) normally? 
NO
Check S9V power supply 
(10) (15) pin, D3.3V power 
supply (3) (36) pin, and 
AUSW-mute signal (29) 
pin of IC1302 (A-SW) or 
the peripheral circuits. 
Is the digital IF signal 
(D_IF
±) output from pins 
(17) (16) of tuner 
(TU1102)?
YES
Check whether there 
are open-circuit or 
short-circuit between 
tuner (TU1102) and 
IC3303.
YES
NO
Is the audio signal (LCH
±/
RCH
±) output form pins 
(31) (27) and (11) (14) of 
IC2701 (A-AMP) prop-
erly? 
NO
Check AMP12.5V power 
supply (1) (10) pin, AMP-
STBY input signal (17) pin, 
and audio-mute signal pin 
(19) of IC2701 (A-AMP) or 
the peripheral circuits. 
Check whether the IF5V 
power supply is sup-
plied to pin (3) of tuner 
(TU1102). 
NO
Check whether there 
are open-circuit or 
short-circuit between 
Q1105 (5V-REG) and 
tuner (TU1102).
YES
YES
Is the audio output signal 
outputted to pins (1)-(4) of 
SP-Connector (P2701) 
normally?
NO
Check SP-Connector 
(P2701) and peripheral cir-
cuits. 
Check whether the I2C 
signal (SDA/SCL) is 
functioning by pin (9) (8) 
of tuner (TU1102).
NO
Pursue an I2C line and 
look for the part of an 
open circuit or the short 
circuit.
YES
YES
Is the SP-Wire harness 
(SP) connected and oper-
ated orthopedically nor-
mally?
NO
Correct an abnormal part 
of SP- harness. 
Check whether IF_AGC 
is functioning between 
pin (E24) of IC3303 and 
pin (15) of tuner 
(TU1102)
NO
Check whether there is 
an open circuit or the 
short circuit in an 
IF_AGC signal line.
YES
YES
Check right and left SP-
BOX, and exchange 
defective SP-BOX 
(R: RSP-ZA392WJZZ/
L: RSP-ZA391WJZZ)
A-BLOCK
Replace tuner 
(TU1102).
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