Sharp AQUOS LC-26GA5H, Service Manual

Page: 38 / 167

38
LC-26GA5H/M/X
TROUBLE SHOOTING TABLE
(Continued)
NO NO NO NO NO NO
YES YES YES
YES YES
YES
YES YES YES
YES
YES
No sound (1)
No sound comes out at UHF/VHF reception. Is the SIF output from the tuner as specified? (Pin (7) of
TU1101)
Are the audio outputs (A-OUT_L/R) from pins (28) and (29) of IC2714 as specified? Are the audio outputs from pins (28) and (29) of IC2714 to pins (11) and (15) of IC2502 as specified? Are the signal from pins (28) and (31) of IC2502 as specified? Is rela
y nor
mally s
witched from R
Y2501 (speak
er
s
witching) on the A
V
PWB?
Are the audio signals from pins (34) and (33) (SC2_OUTL/R) of IC2701 to pins (32) and (33) of IC2714 (DIR) as specified? Is the input signal to pin (67) (ANA_IN1) and pin (69) (ANA-IN2) of IC2701 (MUL
TI_SOUND_PR
OCESSOR) as specified?
Chec
k
TU1101 (UV tuner) and its per
ipher
al
circuits
.
No e
xter
nal input sound comes out.
Are the audio signals inputted to pins (56) (L-ch) and (57) (R-ch) of IC2701? Is the L-ch audio signal outputted to pin (52) of IC3801? Is the R-ch audio signal outputted to pin (54) of IC3801? <INPUT
-1>
Is the L-ch audio signal inputted from pin (5) of input ter
minal J1103 to pin (2) of IC3801?
Is the R-ch audio signal inputted from pin (2) of input ter
minal J1103 to pin (4) of IC3801?
<INPUT
-2>
Is the L-ch audio signal inputted from pin (6) of input ter
minal J1105 to pin (9) of IC3801?
Is the R-ch audio signal inputted from pin (3) of input ter
minal J1105 to pin (11) of IC3801?
<INPUT
-3>
Is the L-ch audio signal inputted from pin (6) of input ter
minal J1101 to pin (16) of IC3801?
Is the R-ch audio signal inputted from pin (3) of input ter
minal J1101 to pin (18) of IC3801?
Chec
k the per
ipher
al circuits of filter circuits
(Q1119, Q1120) (IC1105, IC1106). Chec
k IC2714 and its per
ipher
al circuits
.
Chec
k IC2502 and its per
ipher
al circuits
.
Chec
k the lines from pins (28) and (29) of IC2714
to pins (11) and (15) of IC2502 Are signals LRCK, BICK, SDT
O and SDTI
inputted/outputted from IC2714 to IC2710 (DSP) nor
mally?
Chec
k the lines from pins (34) and (33)
(SC2_OUTL/R) of IC2701 to pins (32) and (33) of IC2714 (DIR).
YES YES YES
NO NO
No sound (3)
No sound comes out from the headphones
.
Chec
k IC2714 and its per
ipher
al circuits
.
Chec
k the m
ute control ter
minal pin (2) of
IC2702.H:
Activ
e
, L:
Mute
Are audio output pins (26) and (27) of IC2714 (DIR) as specified? Are audio output pins (1) and (7) of IC2702 (H/P_AMP) as specified? Chec
k J2402 (Headphone J
a
c
k) and its per
ipher
al
circuits
.
NO NO NO
YES YES YES YES
No sound (2)
Are audio output pins (37) and (36) (SC1_OUT_L/R) of IC2701 (MUL
TI_SOUND_
PR
OCESSOR) as specified?
Are audio output pins (7) and (1) of IC2704 (EQ_AMP) as specified?
YES
Chec
k the per
ipher
al circuits of the MONIT
OR
OUTPUT ter
minal.
Are the m
ute circuit nor
mal? (Q1104, Q1110)
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 IC2701 and its per
ipher
al circuits
.
Chec
k IC2704 and its per
ipher
al circuits
.
Chec
k the Q1104, Q1110 and M.MUTE line
.