Sharp LC-65D90U, Руководство по обслуживанию

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38
LC-65D90U
TROUBLE SHOOTING TABLE
(Continued)
NO NO NO NO NO NO
YES YES YES
YES YES YES
YES YES YES
YES
YES
No sound comes out.
(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 IC2702 as specified? Is the audio input from pins (28) and (29) of IC2702 to pins (11) and (15) of IC2502 (STEREO AMP) nor
mal?
Is the audio output from IC2502 nor
mal?
Is the speak
er s
witching rela
y (R
Y2501) nor
mal?
YES
Chec
k the connector (SP_P2501) of A
V
UNIT and
per
ipher
y of speak
er
.
Are the audio signals from pins (34) and (33) (SC2_OUTL/R) of IC2501 to pins (32) and (33) of IC2702 (DIR) as specified? Is the input signal to pin (67) (SOUNDIF1) of IC2501 (MUL
TI_SOUND_PR
OCESSOR) as
specified?
Chec
k 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 IC2501? Is the L-ch audio signal outputted to pin (15) of IC3805? Is the R-ch audio signal outputted to pin (11) of IC3805? <INPUT
-1>
Is the L-ch audio signal inputted from pin (5) of input ter
minal J1101 to pin (13) of IC3805?
Is the R-ch audio signal inputted from pin (2) of input ter
minal J1101 to pin (9) of IC3805?
<INPUT
-2>
Is the L-ch audio signal inputted from pin (6) of input ter
minal J1101 to pin (3) of IC3805?
Is the R-ch audio signal inputted from pin (3) of input ter
minal J1101 to pin (7) of IC3805?
<INPUT
-3>
Is the L-ch audio signal inputted from pin (5) of input ter
minal J1106 to pin (1) of IC3805?
Is the R-ch audio signal inputted from pin (2) of input ter
minal J1106 to pin (6) of IC3805?
<INPUT
-4>
Is the digital audio signal (HDMI_SPDIF) inputted from pin (78) of IC1912 to pin (43) of IC2702? <INPUT
-5>
Is the L-ch audio signal inputted from pin (2) of input ter
minal J1900 to pin (5) of IC3805?
Is the R-ch audio signal inputted from pin (3) of input ter
minal J1900 to pin (8) of IC3805?
Chec
k the per
ipher
al circuits of filter circuits
(Q1145, Q1105-6). Chec
k IC2702 and its per
ipher
al circuits
.
Chec
k IC2502 and its per
ipher
al circuits
.
Chec
k circuits from pins (28) and (29) of IC2702 to
pins (11) and (15) of IC2502.
(MUTE circuit:
Q2515-7) Are signals LRCK, BICK, SDT
O and SDTI
inputted/outputted from IC2702 to IC2700 (DSP) nor
mally?
Chec
k the lines from pins (34) and (33)
(SC2_OUTL/R) of IC2501 to pins (32) and (33) of IC2702.
NO NO
YES YES
No audio output when receiving digital broadcasting Is audio signal supplied to pins (53) and (54) (SC2_IN_L/R) of IC2501? Is analog audio signal supplied from the digital unit to pins (14) and (12) of A
V_UNIT connector (D
A,
P1105)?
Chec
k the digital unit.
Chec
k betw
een P1105 and IC2501.