Sharp Aquos LC 26GD4U, Service Manual

Page: 42 / 207

42
LC-26GD4U
TROUBLE SHOOTING TABLE
(Continued)
YES YES YES
YES YES YES YES
YES YES
NO
NO NO
NO NO NO
No sound (3)
No sound comes out at digital broadcast reception.
No sound comes out from the headphones
.
Chec
k IC2702 and its per
ipher
al circuits
.
Chec
k the m
u
te control ter
m
inal pin (2) of
IC2502.H:
Activ
e
, L:
Mute
Are audio output pins (26) and (27) of IC2702 (DIR) as specified? Are audio output pins (1) and (7) of IC2502 (H/P_AMP) as specified? Chec
k J2402 (HEAD_PHON_J
A
CK) and its
per
ipher
al circuits
.
Does IC5708 (A
UD_AMP) function w
e
ll?
Chec
k the digital unit.
Chec
k IC5704 and its per
ipher
al circuits
.
Chec
k IC5708 and its per
ipher
al circuits
.
Chec
k the line from the connector (P5704) to
IC5704 and their per
ipher
al circuits
.
Is the signal from the digital unit inputted to the connector (P5704) of A
V_UNIT?
Are the analog-con
v
e
rt
ed audio signals outputted
to output ter
m
inal pins (11) and (8) of IC5704?
Are the audio signals inputted to IC3805 and pin (2) of IC3812? Are signals I2SLRCLK, I2CD
A
T
A
, I2SSCLK and
A
UDMCLK inputted to the input ter
m
inals (pins (1)
to (4)) of IC5704 (D
A
C
)?
NO
NO NO
NO NO NO
YES YES YES YES YES
YES
YES
No sound (2)
Are audio output pins (37) and (36) (SC1_OUT_L/R) of IC2501 (MUL
TI_SOUND_
PR
OCESSOR) as specified?
Are audio output pins (7) and (1) of IC2504 (EQ_AMP) as specified? Are audio output pins (3) and (13) of IC1108 as specified? Chec
k the line from IC1108 to the MONIT
OR
OUTPUT ter
m
inal.
Are the audio signals inputted to input ter
m
inal
pins (2) and (5 ) and pins (14) and (15) of IC1108 (A
UDIO_SW)?
No monitor audio output comes out. Is the monitor audio output set to an
ything other
than "V
ar
iab
le"?
Are the headphones disconnected?
Chec
k IC2501 and its per
ipher
al circuits
.
No audio output f
o
r digital recording comes out.
Chec
k the digital unit.
Chec
k the line from P1105 to IC1108.
Is the audio signal from the digital unit inputted to the connectors (D
A, P1105) of A
V_UNIT?
Are the audio signals inputted to input ter
m
inal
pins (1) and (4) and pins (11) and (12) of IC1108 (A
UDIO_SW)?
Chec
k IC2504 and its per
ipher
al circuits
.
Chec
k the line from IC2504 to IC1108.
Chec
k IC1108 and its per
ipher
al circuits
.
Is the control signal inputted to pin (10) of IC1108 as specified?