Sharp LC-70EQ10U Service Manual page 103

• Does not sound.
INPUT-6 No audio.
Is INPUT-6 selected on the input select
menu screen?
NO
Refer to ": No external input
video [INPUT-6]".
YES
Is the audio output selected for "VARI-
ABLE" on the menu screen?
NO
Set the audio output to
"FIXED".
YES
Does the audio signal come from pins (8)
(L) and (7) (R) of input terminal (J510) to
pins (AP34) (L) and (AU36) (R) of IC3301
(CPU)?
NO
Check the line between J510
and IC3301.
YES
Does the digital audio signal come from pins(AR11/AP11/AN9)(CPU_AOBCK/AOLRCK/AOSDATA0) of IC3301(CPU) to pins(8/9/7)(SP_BCLK/
SP_LRCLK/SP_DATA) of IC1702(Audio DSP)?
NO
Check the line between IC3301 and IC1702, and their paripheral circuits.
YES
• About the L/R Speakers.
Does the digital audio signal come from pins (27/29/32/34) of IC1702 (Audio DSP) to pin (4/3/2/1) of IC1903 (connector for L/R)?
NO
Check IC1702 and its paripheral circuits.(X1701, etc.)
YES
• About the L/R Speakers.
Check the connector (P1903) L/R speakers and their peripheral circuits.
LC-60/70EQ10U,SQ10U/15U/17U,TQ15U,UQ17U
No audio (1)
INPUT-7 No audio.
Is INPUT-7 selected on the input select
menu screen?
NO
Refer to ": No external input
video [INPUT-7]".
YES
Is the audio output selected for "VARI-
ABLE" on the menu screen?
NO
Set the audio output to
"FIXED".
YES
Does the audio signal come from pins (3)
(L) and (2) (R) of input terminal (J510) to
pins (AR37) (L) and (AT36) (R) of IC3301
(CPU)?
NO
Check the line between J510
and IC3301.
YES
6 – 14
INPUT-5 No audio.
Is INPUT-5 selected on the input select
menu screen?
NO
Refer to ": No external input
video [INPUT-5]".
YES
Is the audio output selected for "VARI-
ABLE" on the menu screen?
NO
Set the audio output to
"FIXED".
YES
Does the audio signal come from pins (13)
(L) and (12) (R) of input terminal (J510) to
pins (AT37) (L) and (AT35) (R) of IC3301
(CPU)?
NO
Check the line between J510
and IC3301.
YES