Read Sharp LC-45GD1E (serv.man29) Service Manual online
49
TU-45GD1E
LC-45GD1E
LC-45GD1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (1) (Output from external input terminals)
Connect an external unit to CENTRE CHANNEL
INPUT
. Does the audio
come out of Display-Speaker?
Is there the audio signal input at the CENTRE CHANNEL
INPUT
terminal (J1
105)?
Are the inputs at pins (1) and (2) and the output at pin (9), all on IC2515
(A/D-CON), as specified?
Check to see if "Centre Channel Input" on MENU Option is set at "Of
f". If so, set it
to "On".
Check IC2515 (A/D-CON), power line (pin (6)) and their peripheral
circuits.
Check the 1bit
AMP
,
AUDIO IF UNIT
circuitry
, DISPLA
Y
OUTPUT
3
terminal (SC6001) and their peripheral circuits.
Check the CENTRE CHANNEL
INPUT
terminal (J1
105) for short-
circuit, wrong contact, poor soldering, etc.
YES
YES
YES
Are the input at pin (6) 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
,
AUDIO IF UNIT
circuitry and
DISPLA
Y
OUTPUT
3 (SC6001)?
Check the system cable and display
.
Check IC2515 (A/D-CON), IC2514 (Codec), power line and their
peripheral circuits.
NO
NO
NO
NO
YES
YES
YES
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
erminal)
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) of SF-
Connector?
In the
A
V
PWB : Is the "H" signal output to
Pin (6) of IC3808?
In the
A
V
PWB : Confirm IC3808 SDA3-1
LINE and peripheral circuits.
Is "Speaker Setup" in the MENU-Set up set
to "SPEAKER-B"?
If not, set the "SPEAKER-B".
No audio output from Optical-Audio-OUT
(IC1
109).
YES
YES
YES
YES
YES
YES
NO
NO
NO
YES
YES
Check the "HP-PLUG" signal Line.
Check Pin (4) of Headphone (J2402) thru
Pin (1
1) of IC2509.
Replace IC1
109 or check peripheral circuits.
Check the SPDIF signal from Pin (40) of
MA-Connector (P3802) and Pin (15) of B/B-
Connector (P8903).
Replace IC8903 or check peripheral circuits.
Replace IC8601 or check peripheral circuits.
Replace IC2507 (OPT
-SW) or check
peripheral circuits.
NO
NO
NO
NO
NO
Is output from Optical-Fiber
T
ransmitter
(IC1
109) normal?
Is input into Pin (12) of IC2507 (OPT
-SW)
normal?
In the DVB-T
PWB : Is output from Pin (2) of
IC8903 (INV) coming?
Is output from Pin (AC16) of IC8601
(Processor) normal?
Is output from Pin (8) of IC2507 (OPT
-SW)
normal?
(At digital broadcast reception)
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