Sharp Aquos LC-45GD1E, Service Manual, Page: 52 / 281

52
TU-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (2) (On the reception of TV broadcasting)
Is the SIF audio signal input to Pins (67)(69) of IC2501 (MSP)? No audio output on the reception of UHF/VHF
.
Is the SIF signal output from Pin (7) of TUNER (TU1
101)?
Check the
TUNER (TU1
101) and its
peripheral circuits. Check the signal LINE of Pins (33)(34) of IC2501 thru Pins (32)(33) of IC2514 and peripheral circuits.
YES
NO NO
Check IC2514 and peripheral circuits. Check the SP-SW and 1B-RELA
Y
signals
are coming to Pins (1)(2) of SF connector
.
Go to "No sound (Display area)
".
YES YES YES YES
Is the audio signal of Pins (33)(34) of IC2501 (MSP) thru Pins (32)(33) of IC2514 (CODEC) normal?
Is each audio output from Pins (28)(29) of IC2514 normal?
Is audio output of Pins (28)(29) of IC2514 thru 1 bit-AMP
input (SA/CNA101) normal?
Is output from 1 bit-AMP
(SC/CNA102)
normal? Is connector of
AUDIO-I/F PWB (SC/P6003)
thru Relay switching of R
Y6001 (SPEAKER
ON/OFF switching) and R
Y6000 (SPEAKER
A/B switching) normal? Check DISPLA
Y
-OUTPUT3 (SC6001) and
SYSTEM-CABLE (BLACK).
NO
YES
YES
NO NO NO NO
No audio output on the reception of DTV
.
Is the MAIN-L/R signal of Pins (52)(54) of IC3801 thru Pins (56)(57) of IC2501 coming normally? Is the DTV
-L/R signal coming to Pins
(59)(61) of IC3801 (A
V
-SW) normally?
DVB-T
UNIT
: Is the L/R audio signal output
from Pins (27)(29) of P8903?
Check IC3801 (A
V
-SW) and peripheral
circuits.
Confirm the connection of Pins (27) thru (29) of MA-connector (P3802) and B/B (P8903).
Check IC8904 and peripheral circuits. Check IC8905 and peripheral circuits.
YES YES YES YES
NO NO NO NO NO
Is the L/R audio signal output to Pins (91)(95) of IC8905? Is the digital signal input to Pins (15-17)(19) of IC8905? Check IC8801-8802, IC8804-8805,IC8601 and peripheral circuits.
Check the connection of IC3802 (OP-AMP), Q3805/06 (MUTE), SA
connector (P3801)
and to 1 bit-AMP
.
1) Is a Headphone connected?
•••
Disconnect it.
2) In the MENU-Option, is "Audio Out" set to "V
ariable"?
•••
Set it "Fixed".
3) In the MENU-Option, is "Centre Channel input" set to "on"?
•••
Set it "of
f".
4) In the MENU-Set up, is "Speaker Setup" set to "SPEAKER-B"?
•••
Set it "SPEAKER-A".
Confirm the connection of 1 bit-AMP
and
replace it.
YES
YES
Check IC9008 (DECODER), input/output of DIGIT
A
L
TUNER (TU9001) signal, power
and peripheral circuits.