sci.electronics.repair@googlegroups.com

Today's topics:

* Dead Sony KV-T25SZ8 TV - 2 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/a211bd1fd48660f2?hl=en
* 1.250" dia speaker - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/5dfae7373796a9e5?hl=en
* japan earthquake - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/115ebf2a42d1a935?hl=en

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TOPIC: Dead Sony KV-T25SZ8 TV
http://groups.google.com/group/sci.electronics.repair/t/a211bd1fd48660f2?hl=en
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== 1 of 2 ==
Date: Sat, Mar 12 2011 10:09 pm
From: Clifford Heath

On 03/13/11 16:44, Sylvia Else wrote:
> Probably not, particulary as I've identified a dud transistor that is
> moderately expensive to source,

I replaced the HOT in this TV also. $9 including shipping from WES.
However, HOTs are very strange devices. If you just do the basic
two-diode test, you'll probably consider that a good one has failed.
That's what I did :)... something to keep in mind.

> But we don't get good glass TVs on the nature strip, at least not in my
> suburb.

So drive to the next suburb. Aforementioned friend has picked up
half a dozen perfectly functional TVs that way, usually wide-screen
versions (he prefers those), and provided them to friends. Must get
a few duds, but you can drop those back.

Clifford Heath.

== 2 of 2 ==
Date: Sat, Mar 12 2011 10:37 pm
From: kreed

On Mar 13, 3:28 pm, Clifford Heath <n...@spam.please.net> wrote:
> On 03/12/11 22:18, Sylvia Else wrote:
>
> > This TV died abruptly, and completely without warning, while it was
> > turned on. It appears completely dead, other than than that the
> > degaussing still works.
>
> > There was some burning smell evident immediately after it failed, but
> > nothing has obviously suffered heat trauma.
>
> > Presumably there's a problem with the power supply, which looks like a
> > switch-mode. One thing I've noticed is that when power is connected, it
> > emits a clicking noise - about three times a second. When the power is
> > disconnected, the clicking doesn't stop immediately but continues for
> > several seconds, slowing down.
>
> > The clicking noise isn't coming from the speakers. I assume it's coming
> > from a transformer or choke.
>
> A friend and I (he very experienced) tries to fix a similar fault in a
> similar Sony TV a year back. The clicking was coming from a relay in the
> PSU, which appears to be driven via some circuitry from an opto-isolator
> from the main board. It would appear that it would try to power up, detect
> a fault, and shut off again, repeatedly. We never did get to the bottom of
> it. Really, with so many rather good glass TVs on the nature strip, are you
> sure it's worth the trouble?
>
> Clifford Heath.

We had a nice 2004 vintage Sharp set that failed about a year back.
Intermittent, wouldn't turn on sometimes but would other times.
had a fast look inside and saw corrosion around one of the IC's.
(looked like the CPU).

The set only just fit into the wheely bin, but it did fit. Saved a
trip out to the (isolated) main road to leave it for someone to take
home.

==============================================================================
TOPIC: 1.250" dia speaker
http://groups.google.com/group/sci.electronics.repair/t/5dfae7373796a9e5?hl=en
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== 1 of 1 ==
Date: Sat, Mar 12 2011 10:17 pm
From: isw

In article <ilgp0o$u3j$1@news.eternal-september.org>,
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote:

> >> Uniden is legally obliged to provide service parts.
>
> > Since when? Certainly if they are, there's a time limit --
> > eg, 1 year after a model is discontinued.
>
> Since a long time ago. It used to be 3 years for cosmetic/trim parts, 5
> years for mechanical parts, 10 years for electrical/electronic components.
> The laws appear to have been weakened, and no one seems interested in
> enforcing them.
>
>
> >> If they refuse, there's nothing much you can do about it,
> >> but I'd at least bend their ear. Hard.
>
> > So wait - they're legally obliged but there's nothing you can
> > do if they don't? Doesn't make sense.
>
> It makes perfect sense, if it costs too much money to drag them into court.
>
> Laws are effective only to the extent that people or businesses are willing
> to obey them, and governments to enforce them.
>
> Call Uniden. Tell them that if they don't supply a replacement at a
> reasonable cost, you'll toss the phones in the trash, and will never buy
> Uniden products again.

And they will say "Fine with us, but you should know that disposing of
electronic items that way is illegal in some locales".

Isaac

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TOPIC: japan earthquake
http://groups.google.com/group/sci.electronics.repair/t/115ebf2a42d1a935?hl=en
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== 1 of 1 ==
Date: Sat, Mar 12 2011 10:33 pm
From: paypal cash

see watch videos japan earthquake at http://nadagam.com

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