Sharp LC-60LE920UN Service Manual page 55

LC-52LE920UN/LC-60LE920UN
I .o audio 13) I
I No audio at UHFNHF broadcast si_lnal reception, I
I Is TV selected on the input select menu screen? I
I No audio at di_lital broadcast si_lnal reception, I
Is TV selected on the input select menu screen? ]
_' NO
Refer to "No video at UHF/VHF broadcast signal
reception".
YES
Is the audio output selected for "VARIABLE" on the menu screen?
_' NO
Refer to "No video at digital broadcast signal
reception".
YES
If no video appears, refer to "No video at digital broadcast signal
reception".
_' NO
I Set the audio output to "FIXED". Is the audio output selected for "VARIABLE" on the menu screen? ]
_' NO
I Set the audio output to "FIXED".
YES
I Is there the SlF signal output at pin (14) of tuner (TUl102)? I
_ NO
Check the tuner (TUl102) and its peripheral cir-
cuits.
(12C line: TUNEP,_SCL/TUNEP,_SDA, etc.)
YES
Does the SIF signal come from pin (14) of tuner (TUl102) to pin
(AB27) of IC3302 (CPU)?
_ NO
Check the line between TUl102 and IC3302, and
their peripheral circuits (Ql101, Ql102, etc.).
YES YES
Does the digital audio signal come from pins (F28/F30/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/R Speakers.
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/R Speakers.
Is the audio output from IC2703 as specified?
• About the Subwoofer Speaker.
IS the audio output from IC2702 as specified?
_' Yes
• About the L!R 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.
NO
NO
==-=.I_
Check IC2701 and its peripheral circuits. (X2701, etc.).
• About the L/R Speakers.
Check IC2703 and its peripheral circuits.
• About the Subwoofer Speaker.
Check IC2702 and its peripheral circuits.
6-9