Read Sharp LC-37GA3E (serv.man8) Service Manual online
37
LC-32GA3E
LC-37GA3E
LC-37GA3E
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?
(TU1
101 Pin 7)
Check
TU1
101 (UV tuner) and its peripheral
circuits.
Is the input signal to pin (67) (ANA_lN1+) and
pin (69) (ANA_lN2+) of IC2701
(MUL
TI_SOUND_PROCESSOR) as specified?
Check the peripheral circuits of filter circuits
(Q1
121 -2) (Q1
1
19-20).
Are the audio signals from pins (34) and (33)
(SC2_OUTL/R) of IC2701 to pins (32) and (33)
of IC2714 (DIR) as specified?
Check the lines from pins (34) and (33)
(SC2_OUTL/R) of IC2701 to pins (32) and (33)
(DIR) of IC2714.
Are the audio outputs (A-OUT_L/R) from pins
(28) and (29) of IC2714 as specified?
Are signals LRCK, BICK, SDT
O and SDTI
inputted/outputted from IC2714 to IC2710
(DSP) normally?
Are the audio outputs from pins (28) and (29)
of IC2714 to pins (13) and (15) of P3801 (1-bit
amplifier input) as specified?
Check IC2714 and its peripheral circuits.
Check the lines from pins (28) and (29) of
IC2714 to pins (13) and (15) of P3801 (1-bit
amplifier input). (IC3802, Q3805-6,8)
Is the signal from the 1-bit amplifier inputted to
each terminal of P3810?
Check the 1-bit amplifier and its peripheral
circuits.
Is relay normally switched from R
Y3801
(speaker switching) of the
A
V
PWB ?
No external input sound comes out.
<INPUT
-1>
Is the L-ch audio signal inputted from pin (6) of input terminal SC1
101 to pin (2) of IC3801 ?
Is the R-ch audio signal inputted from pin (2) of input terminal SC1
101 to pin (4) of IC3801 ?
<lNPUT
-2>
Is the L-ch audio signal inputted from pin (6) of input terminal SC1
102 to pin (9) of IC3801 ?
Is the R-ch audio signal inputted from pin (2) of input terminal SC1
102 to pin (1
1) of IC3801 ?
<lNPUT
-3>
Is the L-ch audio signal inputted from pin (6) of input terminal SC1
103 to pin (16) of IC3801 ?
Is the R-ch audio signal inputted from pin (2) of input terminal SC1
103 to pin (18) of IC3801 ?
<lNPUT
-4>
Is the L-ch audio signal inputted from pin (8) of input terminal J141 to pin (23) of IC3801 ?
Is the R-ch audio signal inputted from pin (4) of input terminal J142 to pin (25) of IC3801 ?
< INPUT
-5>
Is the L-ch audio signal inputted from pin (2) of input terminal J1900 to pin (29) of IC3801 ?
Is the R-ch audio signal inputted from pin (3) of input terminal J1900 to pin (31) of IC3801 ?
Is the L-ch audio signal outputted to pin (52) of IC3801 ?
Is the R-ch audio signal outputted to pin (54) of IC3801 ?
Are the audio signals inputted to pins (56) (L-ch) and (57) (R-ch) of IC2701 ?
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