No sound (1)
No sound (2)
No sound (3)
No sound is heard from the speaker in all modes.
Check audio circuits of the Display.
Is the monitor audio output set to "Variable"? or
Is the headphone connected?
Are the audio signal outputs of IC2501 (multi-
sound processor) in order?
Pins (36) and (37) of IC2501 (SC1 OUT L/R).
Check IC2501 (multi-sound processor) and its
peripheral circuits.
Check lines and devices between pins (36), (37)
of IC2501 and pins (1), (3) of the AV unit
connector (P2502). (Q2504-5, Q2509-10 and
Q2513-4)
Set the monitor audio output to "Fixed".
Remove the headphone.
The speaker generates no sound when audio signals are inputted from an external device or a PC.
Check IC1301 (A switch) and its peripherals.
Are the audio outputs of IC1301 (AV switch) in
order?
Pins (52) and (54) of IC1301 (TV MAIN OUT L/R)
Are the audio signal inputs of IC1301 (AV
switch) in order?
Input 1: pins (2) and (4) of IC1301
Input 2: pins (9) and (11) of IC1301
Input 3: pins (16) and (18) of IC1301
Input 4: pins (23) and (25) of IC1301
PC input: pins (29) and (31) of IC1301
Are the audio input circuits of IC1301 (AV switch)
in order?
Input 1: Between pins (5), (14) of J1103 and pins
(2), (4) of IC1301
Input 2: Between pins (2), (11) of J1103 and pins
(9), (11) of IC1301
Input 3: Between pins (5), (14) of J1104 and pins
(16), (18) of IC1301
Input 4: Between pins (5), (7) of J2404 and pins
(23), (25) of IC1301
PC input: Between J2403 and pins (29), (31) of
IC1301
Are the audio inputs of IC2501 (multi-sound
processor) in order?
Pins (56) and (57) of IC2501 (SCI IN1 L/R)
YES
NO
YES
YES
YES
NO
NO
NO
No audio output <Input1> No audio output <INPUT2/3>
Has the input mode been selected on the Input Select screen?
Are the audio outputs of IC2501 (multi-sound
processor) in order?
Pins (27) and (28) of IC2501 (DRCM L/R)
Check lines and devices between pins (27), (28)
of IC2501 and pins (3), (1) of INPUT1. Also
check the audio mute circuits.
(IC2504, Q1101-2)
Are the audio outputs of IC1301 (AV switch) in
order?
Pins (43) and (45) of IC1301 (SC1 TV SUB OUT L/R)
Check lines and devices between pins (43), (45)
of IC1301 and pins (3), (1) of INPUT2/3. Also
check the audio mute circuits.
(IC1301, Q1104-7 and Q1109-12)
No monitor audio output or abnormal audio
The audio level is abnormal:
Is the monitor audio output set correctly?
"Variable" or "Fixed"
NO
YES
No sound at all:
Are the audio outputs of IC2501 (Multi-sound
processor) in order?
Pins (34) and (33) (SC2 OUT L/R) of IC2501
Check lines and devices between pins (34), (33)
of IC2501 and the monitor output (J1101). Also
check the audio mute circuit.
(Q2502-3, Q1114-5 and Q1106-7)
YES
Check peripherals of the SR unit DISPLAY
OUTPUT 2 terminal (SC6000).
YES
YES
YES
YES
YES
Are audio signals applied to the AV unit
connectors (pins (1) and (3) of P2502)?
YES
The speaker generates no sound when TV signal is received.
Are the tuner audio inputs of IC2501 (multi-sound
processor) in order?
Pin (67) (sound IF1) of IC2501
Pin (69) (sound IF2) of IC2501
Is the audio signal applied to pin (21) of tuner
output?
Check B.P.F. of SIF1 and SIF2.
(Q1119-20 and Q1121-2)
Check IC2501 (multi-sound processor) and its
peripheral circuits.
YES
YES
NO
NO
Check TU1101 (U/V tuner) and its peripherals.
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