Sharp Aquos LC-26D4U Wartungshandbuch PDF herunterladen (Seite 36)

LC-26D4U

LC-32D4U

LC-37D4U

TROUBLESHOOTING TABLE (Continued)

YES

No sound comes out. (1)

No sound comes out at UHF/VHF reception.

Is the SIF output from the tuner as

specified?(TU1101_Pin7)

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) normal?

Is the audio output from IC2502 normal?

Is the speaker switching relay (RY2501) normal?

YES

Check the connector (SP_P2501) of AV_UNIT and

periphery of speaker.

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 (MULTI_SOUND_PROCESSOR) as

specified?

Check tuner and its peripheral circuits.

No external 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 terminal J1101 to pin (13) of IC3805?

Is the R-ch audio signal inputted from pin (2) of input terminal J1101 to pin (9) of IC3805?

<INPUT-2>

Is the L-ch audio signal inputted from pin (6) of input terminal J1101 to pin (3) of IC3805?

Is the R-ch audio signal inputted from pin (3) of input terminal J1101 to pin (7) of IC3805?

<INPUT-3>

Is the L-ch audio signal inputted from pin (5) of input terminal J1106 to pin (1) of IC3805?

Is the R-ch audio signal inputted from pin (2) of input terminal J1106 to pin (6) of IC3805?

<INPUT-4>

Is digital audio signal (HDMI_SPDIF) sent from pin 78 of IC1912 to pin 43 of IC2702?

(Analog audio mode)

Is the L-ch audio signal inputted from pin (2) of input terminal J1900 to pin (5) of IC3805?

Is the R-ch audio signal inputted from pin (3) of input terminal J1900 to pin (8) of IC3805?

Check the peripheral circuits of filter circuits

(Q1145, Q1105-6).

Check IC2702 and its peripheral circuits.

Check IC2502 and its peripheral circuits.

Check circuits from pins (28) and (29) of IC2702 to

pins (11) and (15) of IC2502. (MUTE circuit:

Q2515-7)

Are signals LRCK, BICK, SDTO and SDTI

inputted/outputted from IC2702 to IC2700 (DSP)

normally?

Check the lines from pins (34) and (33)

(SC2_OUTL/R) of IC2501 to pins (32) and (33) of

IC2702.

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 (11) and (9) of AV_UNIT connector (DA,

P1105)?

Check the digital unit.

Check between P1105 and IC2501.

YES

No monitor audio output during digital broadcasting reception

Are audio signals sent to pins 53 and 54

(SC2_IN/L/R) of IC2501?

Are analog audio signals sent from digital unit to

pins 9 and 11 of AV_UNIT connector (DA, P3101)?

Check the digital unit.

Check between P1105 and IC2501.

YES

No monitor audio output comes out.

Are audio output pins (37) and (36)

(SC1_OUT_L/R) of IC2501 (MULTI_SOUND_

PROCESSOR) as specified?

Is the audio output of monitor output set to

"Variable"?

Reset the audio output of monitor output to

"Fixed".

Check IC2501 and its peripheral circuits.

YES

Check the line from IC1108 to the MONITOR

OUTPUT (J1106) terminal.

Are audio output pins (7) and (1) of IC2504

(EQ_AMP) as specified?

Check IC2504 and its peripheral circuits.

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 101 102

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