Anyone know about repair of A/V receivers?

[anon12000]

Hello,

I have a Sony STR-DE825 Audio/Video Receiver and it has recently
started with this problem.

When the unit is powered on no audio is output. I must repeatedly
power on/power off, power on/power off, etc. and then eventually it
will work. Sometimes I push that power button on&off many, many times
before it starts to work.

When it powers on all of the lights come on and after a second or two
I hear the usual little click sound right before where the sound
usually starts to output. It "clicks" but no sound.

So, can anyone suggest what the problem is and 1) if it is repairable
and 2) should a non-Sony authorized repair person who is an
electronics repair pro be able to get the part(s) and fix it.

Thank you very much for any help.

 

[Leonard Caillouet]

"Alan Harriman" <vtech@usol.com> wrote in message
news:vj4qivkpdnpdkepdl56uifvmuocs38egaa@4ax.com...

So, can anyone suggest what the problem is and 1) if it is repairable
and 2) should a non-Sony authorized repair person who is an
electronics repair pro be able to get the part(s) and fix it.

Yes, if he is an electronics repair technician experienced in servicing
audio
systems, he should be able to service your equipment and generally would
have
the same access to parts and service literature availability as any Sony
ASC.

Well, not quite the same. The ASC should already have the literature and
access to the symptom repair database without having to call a 900 number
and without paying additional money for the literature, and may have more
experience with the problem. It might not matter in this case, as it may
just be some bad solder connections, which any decent tech can find.

All else being equal, ASCs will usually (Hitachi being an exception because
of their open access to information) be a more efficient choice, but that
does not mean that the quality of service will better. I point this out to
people all the time who bring me things for which I am not an ASC. If they
want my excellent service they may have to pay more to cover my costs. Most
bring it to me anyway because the ASC choices are mostly not so great, if
there are any.

Leonard Caillouet

 

[Alan Harriman]

Hello,

I have a Sony STR-DE825 Audio/Video Receiver and it has recently
started with this problem.

When the unit is powered on no audio is output. I must repeatedly
power on/power off, power on/power off, etc. and then eventually it
will work. Sometimes I push that power button on&off many, many times
before it starts to work.

When it powers on all of the lights come on and after a second or two
I hear the usual little click sound right before where the sound
usually starts to output. It "clicks" but no sound.

So, can anyone suggest what the problem is and 1) if it is repairable
and 2) should a non-Sony authorized repair person who is an
electronics repair pro be able to get the part(s) and fix it.

Yes, if he is an electronics repair technician experienced in servicing audio
systems, he should be able to service your equipment and generally would have
the same access to parts and service literature availability as any Sony ASC.

Alan Harriman

Thank you very much for any help.

 

[Mark D. Zacharias]

I have to say, your approach of turning on, off "many, many times"
disturbs me. If there were an actual component failure inside, this might
make other parts go bad. In any case, you are definitely straining the unit
every time you hit the power ON button. The main power relay is only good
for X number of cycles. The output transistors will fail sooner. Other parts
may be advanced closer to their ultimate failure. Think of a common light
bulb. When is the most common time for it to fail?

Answer:

When you first turn it on.


Mark Z.



"anon12000" <anon12000@yahoo.com> wrote in message
news:73d09bf6.0308030522.19bdea20@posting.google.com...

Hello,

I have a Sony STR-DE825 Audio/Video Receiver and it has recently
started with this problem.

When the unit is powered on no audio is output. I must repeatedly
power on/power off, power on/power off, etc. and then eventually it
will work. Sometimes I push that power button on&off many, many times
before it starts to work.

When it powers on all of the lights come on and after a second or two
I hear the usual little click sound right before where the sound
usually starts to output. It "clicks" but no sound.

So, can anyone suggest what the problem is and 1) if it is repairable
and 2) should a non-Sony authorized repair person who is an
electronics repair pro be able to get the part(s) and fix it.

Thank you very much for any help.

 

[Sofie]

"Wdyorchid" <wdyorchid@aol.com> wrote in message
Correction: The protection circuit is design to protect your speaker and
yourself from direct DC damage because some Amps have voltage as high
90V
maybe more.
-Wdy
---------------------

Wdyorchid:

I am glad that you CORRECTLY corrected yourself.
There seems to be a common mis-conception about the PROTECTION circuity in
audio amplifiers and stereo receivers...... especially among the non-tech
types.... but even some "techs" may get it twisted a little.
Here is my treatise on this matter:

My many years of repair experience with all kinds of audio equipment
suggests that the "protection" circuity actually protects the speaker NOT
the amplifier, in most designs.

When the protection circuitry in the amp senses DC on the speaker
rails due to an audio stage component failure, the protection relay
will drop out thus disconnecting and PROTECTING the speakers from the
very damaging DC... usually full power supply B+ voltage and current
which can fry the voice coils in most speakers just about instantly.

Failures in the amplifier circuitry can be easily caused by shorted
speaker wires, running too many speakers, too loud of a volume driving
the amp into severe distortion, other component and circuity failures
due to heat, stressed components, bad solder connections, old age and
"just because" it was time for a part to fail.

In most designs, an amp will "try" to drive all of it's power into a
short or overload (too many speakers) and will quickly cause component
failures that can NOT be reset.... the protection circuity will sense
DC on the speaker rails which indicates component and circuitry
failures that MUST BE REPAIRED ..... in most designs it will NOT
sense shorted speaker wires and will not PROTECT the amplifier..... the
purpose is to PROTECT your speakers. Usually when an amplifier displays a
"protect" message or the protection relay does not click or energize.....
IT IS TOO LATE...... repairs and replacement parts are needed......
removing the shorted speaker wires or disconnecting the "too many" speakers
will not usually fix the problem.

Best Regards,
Daniel Sofie
Electronics Supply & Repair
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