Sharp Aquos LC-45GD1E, Service Manual, Page: 50 / 281

50
TU-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (1) (A
udio fr
om e
x
ternal input terminals)
Connect an e
x
ter
nal unit to CENTRE CHANNEL INPUT
. Does the audio
come out of Displa
y
-Spea
ke
r?
Is there the audio signal input at pin (2) of the CENTRE-CHANNEL- INPUT ter
m
inal (J1102)?
Are the inputs at pins (1) and (2) and the output at pin (9), all on IC2515 (A/D-CON), as specified?
Chec
k IC2515 (A/D-CON) po
w
e
r line pin (6) (5V) and pin (7) (3.3V) and
their per
ipher
al circuits
.
Chec
k the 1bit AMP
, A
UDIO IF UNIT circuitr
y,
DISPLA
Y OUTPUT 3
ter
m
inal (SC6001) and their
per
ipher
al circuits
.
Chec
k the CENTRE CHANNEL INPUT ter
minal (J1102) f
o
r shor
t-
circuit, wrong contact, poor solder
ing, etc.
YES
YES
Are the input at pin (26) of IC2510 (S-DSP) and the outputs at pins (28) and (29) of IC2514 (Codec) as specified?
Is there the audio signal at 1bit AMP
, A
UDIO IF UNIT circuitr
y and
DISPLA
Y OUTPUT 3 (SC6001)?
Chec
k the system c
ab
le and displa
y
b
loc
k.
Chec
k IC2510 (S-DSP), IC2514 (Codec
), po
w
e
r line and their
per
ipher
al circuits
.
NO
NO NO NO
YES
YES
In the MENU-Option, is "Centre Channel input" set to "off"?
···Set it
"On".
No sound (1) (Output from external terminals)
No Head phone sound output. Are output from Pins (26)(27) of IC2514 (CODEC) and Pins (1)(7) of "HP-R/L- IN"~IC2502 (HP_AMP) and the Q2501 (HP_MUTE) circuit normal?
Check the Headphone terminal (J2402) and peripheral circuits.
No audio output from External Speakers. (SPEAKER-
B
T
e
rm
inal)
In the
AUDIO-IF PWB : Is RELA
Y
(R
Y6000)
normally operated? In the
AUDIO-IF PWB : Is the "H" signal
coming to "SP-SW" of Pin (1) (P6002) of SF-Connector? In the
A
V
PWB : Is the "H" signal output to
Pin (6) of IC3808 (SP
Switch)?
In the
A
V
PWB: Confirm IC3808 SDA3-
1/SCL3-1 LINE and peripheral circuits.
Is "Speaker Setup" in the MENU-Set up set to "SPEAKER-A"? If not, set the "SPEAKER-B".
No audio output from Digital-Audio-OUT (IC1
109).
YES
YES
NO NO NO
NO NO NO
YES YES
Check the "HP-PLUG" signal Line. Check Pin (4) of Headphone (J2402) thru Pin (13) of P2402, Pin (1
1) of IC2509.
Is input into Optical-Fiber
T
ransmitter
(IC1
109) normal?
Check the SPDIF signal from Pin (40) of MA-Connector (P3802) and Pin (15) of B/B- Connector (P8903).
Replace IC2507 or check peripheral circuits.
Replace IC8601 or check peripheral circuits.
Check or replace the power line of Optical- Fiber T
ransmitter
YES
NO
YES YES
NO
In the
A
V
PWB: Is output from Pin (8) of
IC2507(OPT
-SW) normal?
Is the SPDIF signal coming to Pin (12) of IC2507 (OPT
-SW) normal?
In the DVB-T
PWB : Is SPDIF signal output
from Pin (2) of IC8903 (INV)? Is output from Pin (AC16) of IC8601 (Processor) normal?
(At digital broadcast reception)
Check between pin (8) of IC2507 and
T
ransmitter
(IC1
109).
YES