No Sound - Sharp LC-32LE600E Service Manual

LC-32/40/46LE600E/RU/S (1st Edition)
No audio output during UHF/
VHF 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)
Is the audio signal
(AOUT_SP_L/R) output from
pins (H26) and (H25) of
IC3303 (VCT)?
(MAIN-UNIT) YES
Is the audio signal
(SPKOUT_L/R) output form
pins (17) and (18) of
IC1302 (A-SW) normally?
YES
Is the audio signal (LCH±/
RCH±) output form pins
(31)/(27) and (11)/(14) of
IC2701 (A-AMP) normally?
YES
Is the audio output signal
outputted to pins (1)-(4) of
SP-Connector (P2701) nor-
mally?
YES
Is the SP-Wire harness
connected and operated
orthopedically normally?
YES
Check right and left SP-
BOX, and exchange defec-
tive SP-BOX
(R: RSP-ZA392WJZZ/
L: RSP-ZA391WJZZ)
No sound (1-1) (during the reception of TV broadcasting)
NO
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.
NO Check AMP12.5V power
supply (1) (10) pin, AMP-
STBY input signal (17)
pin, and audio-mute sig-
nal pin (19) of IC2701 (A-
AMP) or the peripheral
circuits.
NO Check SP- Connector
(P2701) and peripheral
circuits.
NO Correct an abnormal part
of SP- harness.
A-BLOCK
(TUNER SIDE)
Is the audio signal (SIF)
input to pin (AB25) of
IC3303 (VCT)?
NO
Is the SIF signal output
from pin (4) of tuner
(TU1102)?
NO
Check whether IF5V
power supply is sup-
plied to pin (3) of tuner
(TU1102), and ANT5V
power supply is sup-
plied to pin (1) of tuner
(TU1102)?
YES
Check whether the I2C
signal (SDA/SCL) is
functioning by (9) (8)
pin of tuner (TU1102).
YES
Check whether IF_AGC
is functioning between
pin (E24) of IC3303 and
pin (15) of tuner
(TU1102)
YES
Replace tuner
(TU1102).
5 – 5
YES Check whether there are a
power supply of IC3303
(VCT), the short circuit,
and other abnormalities.
YES Check whether there are
open-circuit or short-cir-
cuit between tuner
(TU1102) and IC3303.
NO Check whether there are
open-circuit or short-cir-
cuit between tuner
(TU1102) and Q1105 (5V-
REG) or between tuner
and IC1101.
NO Pursue an I2C line and
look for the part of an
open circuit or the short
circuit.
NO Check whether there is an
open circuit or the short
circuit in an IF_AGC sig-
nal line.