3. No audio output generated.(It applies both LT-30
XX
and LT-22
XX
)
Notes) This model is enabled to set up an audio input terminal for each video input terminal. No
audio output is available unless the input terminal of displayed pictures (example:VIDEO1)
coincides with that of audio (example:PC). Therefore, analysis for troubleshooting should be
carried out after the displayed video input terminal (example:VIDEO1) has been made to coincide
with the input terminal according to the instruction manual.
Enter a signal input AUDIO in.
Is “TV speakers” setting on?
Raise volume level. And MUTE is turned off.
Volume level is not 0. And MUTE is off.
YES
NO
“TV speakers” setting is on.
NO
YES
In case of TV input, is “Listen To:” setting set
to Stereo or Mono?
NO
YES
“Listen To :” setting is set to Stereo
or Mono.
Are the specified voltages available at the
pins below? (Power source check)
NO
CN
Name
Pin No. Voltage
S5V
J303
12
5Vdc
A5V
J8A0
1
5Vdc
A9V
J8A0
10
9Vdc
A8V
C733
-
8Vdc
AMPVCC
IC711
1
7~9Vdc
SAMPVCC
IC712
1
8~12V
dc
Psave2*
J712
6
3Vdc
Psave3**
J712
7
3Vdc
*control signal of A9V, A8V, A5V
** control signal of AMPVCC, SAMPVCC
Problem is in the following
circuit (and peripheral
circuits) .
Voltage with
problem
PWB
including
the circuit
in problem
S5V
SET(SUB)
A5V
SET(SUB)
A9V
SET(SUB)
A8V
SET(SUB)
AMPVCC
SET(SUB)
SAMPVCC
SET(SUB)
Psave2
MAIN
Psave3
MAIN
YES
Is voltage the same before and behind F870
and F880?
NO
It replaces the
PWB-SET(SUB)
.
(Fuse have blown out. )
YES
Page 51
MODELS: LT-2220
/ LT-2240 /
LT-3020
/ LT-3040 / LT-3050
