Sharp 52LE920UN, 60LE920UN service manual INPUT-2 No audio, Variable, AUBCK/AULP,CK/AOSDATA0

LC-52LE920UN/LC-60LE920UN

I Noaudio11) I

€

I INPUTNoaudio,-1 I

I INPUT-2 No audio, I

¢

[ Is INPUT-1

selected

on the input select menu screen?

]

Is INPUT-2

selected

on the

input select menu screen?

I

_' NO

NO

[ Refer to ": No external input video [INPUT-I]".

]

I Refer

to "

No external

input video [INPUT-2]".

I

YES

YES

[ Is the audio

output

selected

for "VARIABLE"

on the menu screen?

]

Is the audio

output

selected

for

"VARIABLE"

on the menu screen?

I

_' NO

_' NO

Set the

audio output to "FIXED".

I Set the audio output to "FIXED".

YES

YES

Does the audio signal come from pins (4) (L) and (1) (P,) of input

Does the audio

signal come from pins (4) (L) and (3) (P,) of input

terminal (J505) to pins (P,28) (L) and (T26) (P,) of IC3302 (CPU)?

terminal (J507)

to pins (U29)(L) and (U28) (P,) of IC3302 (CPU)?

_' NO

_' NO

[ Check

the line between

J507 and IC3302.

]

I Check

the

line between

J505 and IC3302.

YES

YES

Does the digital audio signal

come from pins

(F28/F3O/G28)

(AUBCK/AULP,CK/AOSDATA0)

of

IC3302 (CPU)

to pin (8/9/7) (SP_BCLK/SP_LP,CLK/SP_DATA)

of IC2701 (Audio DSP)?

_' NO

Check the line between IC3302 and IC2701, and their peripheral circuits.

YES

• About the L/P, Speakers.NO Check IC2701 and its peripheral circuits. (X2701, etc.). Does the digital audio signal come from pins (47/43/44/45) of

IC2701 (Audio DSP) to pin (5/8/7/6) of IC2703 (AMP for L/P,)?

• About the Subwoofer speaker.

Does the digital audio signal come from pins (47/43/44/46) of IC2701 (Audio DSP) to pin (5/8/7/6) of IC2702 (AMP for SW)?

_' YES
• About	the	L/P, Speakers.			NO	•	About	the L/P, Speakers.
Is the audio		output from	IC2703	as specified?		Check		IC2703 and its peripheral	circuits.
• About	the Subwoofer		Speaker.			•	About	the Subwoofer Speaker.
IS the audio		output from	IC2702	as specified?		Check		IC2702 and its peripheral	circuits.

_' Yes

• About the L!P, Speakers.

Check the connector (P2701) L/P, speakers and their peripheral cir- cuits.

• About the Subwoofer Speaker.

Check the connector (P2702), subwoofer speaker and their periph- eral.

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