Cheap stereo electronics, What do you think failed on these models?

[Glenn]

DAMAGED KLH R3100 AM/FM Stereo Audio/Video Receiver
NOTE: POWERS UP THEN SHUTS OF

DAMAGED KLH R3100 AM/FM Stereo Audio/Video Receiver
NOTE: Does not power on


DAMAGED INSIGNIA IS-HC040918 200w AM/FM STEREO RECEIVER
NOTE: When powered on reciever error and powers off.



There are several of these models on Ebay.
What do you think the chances are that the power supply failed or the
audio power amp shorted? What would be the chances of finding the
power out amp chip?
These can be bought anywhere between US. $15,00 to $25.00 shipped.

 

[Dr. Anton T. Squeegee]

DAMAGED KLH R3100 AM/FM Stereo Audio/Video Receiver
NOTE: POWERS UP THEN SHUTS OF

<snippety>

Why are you asking the same question when your original post has
already been answered? In-depth, I would add.

Unless you've already got a lab's worth of test gear,
desolder/solder equipment, and the experience to use it all, my advice
would be to simply save your pennies and go get a decent new receiver.


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"

 

[Glenn]

Becaus the original post asks

There are several of these models on Ebay.
What do you think the chances are that the power supply failed or the
audio power amp shorted? What would be the chances of finding the
power out amp chip?
These can be bought anywhere between US. $15,00 to $25.00 shipped.

This question does not gets transfered with the RE post.
I would not call this an in-depth answere!
Why do people do cross word puzzles? When the answeres are on the
next page.
If I can get a $200.00 stereo and have only $20.00 in it, that leaves
$180.00 for other toys.
My last project was a 60" bigscreen with $65.00 in it.
It's all in the math! I have more time than money.

Are you a Doctor of electronics?

 

[William R. Walsh]

Hi!

What do you think the chances are that the power supply failed or the
audio power amp shorted? What would be the chances of finding the
power out amp chip?

As others have mentioned, it is hard to say. You could buy them and you
might just get lucky...

However, it's a big chance to take. Even if you can fix what is wrong, the
parts may cost as much as you've got invested in the receiver.

You might also find working gear for less...I bought a Pioneer stereo
receiver (digitally tuned, four speaker plugs, lots of inputs) for about 50
cents. It had no cover and the old man selling it insisted that it didn't
work. At the time I thought the alphanumeric display might be interesting.

I've been using it for three years since then. It works well and plays
nicely. I've even found a remote control for it. Someday I might build a
wooden cover to replace the missing metal one (unless someone here might
have one...ST-277R is the model # IIRC). For now I am not too worried. The
unit is safely out of reach of anyone who might get inside it.

If you really insist on buying one or more of these broken units, I'd go for
the KLH. Insignia is a brand sold by Best Buy stores (in the US) and as such
is probably A) bargain basement cheap and B) impossible to find service
information for.

William

 

[Glenn]

I know what you mean. I buy broken electronics at garage sales, for
next too nothing and some free. It's great experience and finding
useable parts. I would rather repair a ten year old VCR, that would
last longer than todays brand new.
I don't have much experience with todays new electronics, but I am
sure they are pushed to the limits on tolerence.
I know these stereo's have protection circuits, if the circuit detects
a short, the power supply shuts down. which makes me think the main
power amp is shot. But also could be a shorted diode in the power
supply.
As many of these models that are on Ebay with power supply problems,
I thought somebody might of work on them.
If anyone says it's the main out amp, I will blow them off.
I have a Fisher stereo that I replaced the dual channel out amp in
1990. It has blown one channel again. The price in 90 was $11.00,
now they are $40.00 plus.
I am looking for something cheap for the garage.

 

[Mike Berger]

Then hunt around your local garage sales, where working receivers
and amps are usually pretty cheap. The particular ones you mentioned
are junk and not worth fixing even if you can do it cheap. You can
find better ones at resale shops and garage sales.