Sharp LC-60E77UN Service Manual page 59

No audio at UHF/VHF broadcast signal reception.
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
Set the audio output to "FIXED".
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: TUN_SCL/TUN_SDA, etc.).
YES
Does the SIF signal come from pin (14) of tuner (TU1102) to pin (D5)
of IC8001 (CPU)?
NO
Check the line between TU1102 and IC8001, and
their peripheral circuits (Q1101, Q1102, etc.).
YES
Does the audio signal come from pins (N29/N30) (PGA0OUT_L/R) of IC8001 (CPU) to pins (4/7) (INLP/INRP) of IC2701 (AMP)?
YES
Is the audio output from IC2701 as specified?
YES
Check the connector (P2701), speakers and their peripheral circuits.
LC-60E77UN/LC-65E77UM/LC-C6077UN/LC-C6577UM
No audio (3)
No audio at digital broadcast signal reception.
Is TV selected on the input select menu screen?
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?
YES
NO
Check the line between IC8001 and IC2701, and their peripheral
circuits (Q1306, AMP_MUTE line, etc.).
NO Check IC2701 and its peripheral circuits.
6 – 11
NO
Refer to "No video at digital broadcast signal
reception".
NO
Set the audio output to "FIXED".