LC-40D68UT
6 – 11
No audio (4)
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?
YES
NO
YES
NO
Refer to “No video at UHF/VHF broadcast signal
reception”.
Refer to “No video at digital broadcast signal reception”.
Is the audio output selected for “VARIABLE” on the menu screen?
If no video appears, refer to “No video at digital broadcast signal recep-
tion”.
Is the audio output selected for “VARIABLE” on the menu screen?
YES
NO
YES
NO
Set the audio output to “FIXED”.
Set the audio output to “FIXED”.
Is there the SIF signal output at pin (16) of tuner (TU1101)?
Is there the AFT signal output at pin (17) of tuner (TU1101)?
YES
NO
Check the Tuner I2C lines.
1) TU1101: pin (8) (TUN_SDA_C5), pin (9)
(TUN_SCL_C5)
2) SC1101/SC1201: pin (16), pin (15)
3) IC8001: pin (F2), pin (E1)
Check TU1101 and its peripheral circuits.
Does the SIF signal come from pin (16) of tuner (TU1101) to pin
(D5) of IC8001 (CPU)?
Does the AFT signal come from pin (17) of tuner (TU1101) to pin
(W22) of IC8001 (CPU)?
YES
NO
Check the line between TU1101 and IC8001, and their
peripheral circuits (Q1101, Q1102, etc.).
1) TU1101: pin (16) (SIF), pin (17) (AFT_OUT)
2) SC1101/SC1201: pin (8), pin (12)
3) IC8001: pin (D5), pin (W22)
Does the audio signal come from pins (C4/A3) (SPOUT_L/R) of IC8001 (CPU) to
pins (3) (INLP), and (7) (INRP) of IC2701 (AMP)?
NO
Check the line between IC8001 and IC2701, and
their peripheral circuits (Q1306/Q1307,
AMP_MUTE line, etc.).
YES
Is the audio output from IC2701 as specified?
NO
Check IC2701 and its peripheral circuits.
YES
Check the connector (P2701), speakers and their peripheral circuits.
