No Sound - Sanyo PLV-55WR1Z Service Manual

Troubleshooting
● No ● No Sound
o Sou o d
Check following steps. k ll
No sound with TV input
source
Yes
Is TV audio signal
observed at pins 62 and
64 of IC3001?
No sound with all of
input sources
Yes
No
Is the audio signal
observed at pins 1 and
32 of IC001?
Yes
Is Is the audio signal aud a dio o
observed at pins 12 and ob b se d at pin ns
7 of IC041?
Yes
No sound with head-
phone
No
No sound with woofer
Check TV audio signal circuit.
No
TV SIF signal is output from IC201 and sent to IC3400(TV sound
processor IC). NICAM signal is decoded in IC3400. TV_L/R signals
are output from IC3400 and sent to IC3001(Selector IC) .
Yes
--> Check IC201, IC3400 and peripheral circuit.
No Check audio selecting circuit.
All of the audio input signals are selected in IC3001.
-->
sig gna al No No Ch Check audio amp.and control circuit.
12 an d
--> Check 33V_AUD power supply line.
-->
MUTE signal (Mute:L) is applied on pin 11 of IC041 from pin 10 of
IC001. If a headphone is connected at the phone terminal, MUTE sig-
nal is also applied on IC041.
--> Check MUTE signal.
Check audio output circuit.
-->
Yes
Check headphone audio amp. circuit.
--> Check 5V_PH power supply line.
Audio signals from IC001 are amplified in IC051(phone amp. IC).
-->
MUTE signal (Mute:L) is applied on pin 2 of IC051 from pin 10 of
IC001. --> Check MUTE signal.
Yes
Check woofer audio amp. circuit.
--> Check 9VA power supply line.
Audio signal from IC001 is amplified in IC031(woofer amp. IC).
-->
No signal mute signal (Mute:H) is applied to IC2091 from pin 12 of
IC6 IC6301.
-- --> Check MUTE signal.
Check IC3001 and peripheral circuit.
p.a an nd ntro ol c irc uit.
k 33 3V D p o wer sup pl
Check IC041(audio-amp IC), IC001(audio control IC) and periph-
eral circuit.
Check speaker, connection of the terminal "K01R/K01L".
Check IC051 and peripheral circuit.
Check IC031 and peripheral circuit.
g mut signa (Mu
301.
Chec MU E sig al
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y lin e
p