Sharp LC-52LE920UN - Page 55

LC-52LE920UN/LC-60LE920UN
| No audio (3) |
| No audio at UHF/VHF broadcast signal reception. | No audio at digital broadcast signal reception. |
| Is TV selected on the input select menu screen? | Is TV selected on the input select menu screen? |
4 NO ' NO
Refer to “No video at UHF/VHF broadcast signal Refer to “No video at digital broadcast signal
reception”. reception’.
v YES
Is the audio output selected for “VARIABLE” on the menu screen?
¥ No
| Set the audio output to “FIXED”.
v
YES
Is there the SIF signal output at pin (14) of tuner (TU1102)?
' NO
Check the tuner (TU1102) and its peripheral cir-
cuits.
(I2C line: TUNER_SCL/TUNER_SDA, ete.)
v YES
Does the SIF signal come from pin (14) of tuner (TU1102) to pin
(AB27) of IC3302 (CPU)?
¥ No
Check the line between TU1102 and 1C3302, and
their peripheral circuits (Q1101, Q1102, etc.).
Y YES
YES
If no video appears, refer to “No video at digital broadcast signal
reception’.
‘
| Is the audio output selected for “VARIABLE” on the menu screen? |
' NO
| Set the audio output to “FIXED”. |
v
YES
Does the digital audio signal come from pins (F28/F30/G28) (AUBCK/AULRCK/AOSDATAQO) of
IC3302 (CPU) to pin (8/9/7) (SP_BCLK/SP_LRCLK/SP_DATA) of 1C2701 (Audio DSP)?
¥ No
Check the line between 1C3302 and 1IC2701, and
their peripheral circuits.
¥ YES
e 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 1C2703 (AMP for L/R)?
e 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
e About the L/R Speakers.
Is the audio output from 1C2703 as specified?
e About the Subwoofer Speaker.
IS the audio output from 1C2702 as specified?
+ Yes
e About the L/R Speakers.
Check the connector (P2701) L/R speakers and their peripheral cir-
cuits.
e About the Subwoofer Speaker.
Check the connector (P2702), subwoofer speaker and their periph-
eral.
NO
NO
Check IC2701 and its peripheral circuits. (X2701, etc.).
e About the L/R Speakers.
Check IC2703 and its peripheral circuits.
e About the Subwoofer Speaker.
Check IC2702 and its peripheral circuits.