Electronics Forum / Repair / June 2007

My 12 y.o. 25" Zenith TV suddenly went blank, started emitting a high-
pitched squeal and the smell of frying electronic components until I
unplugged it. I did a little research into a high-pitched squeal and
found it's usually something fixable. Is it worth trying to have it

Now this is really driving me nuts, and the first thing tomorrow it
gets stowed and we can make some money maybe.
OK, set comes in, shuts down immediately, with scope I find offset in
the convergence output, a pretty healthy one.

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Hi I had this problem for a long time and it was bugging me all the
time. Recently I found a great thread in a tech support site that
explain how to fix it. Here is the solution page for the Do not
disconnect error:

All,
I have one of these units, about 6 months old.  Out of the blue, it cannot
load any DVDs.  All I use are factory-pressed units.
The tray closes, you can hear the laser pickup sliding back and forth on

Only 2.5 Kg weight and 10x6x 2.5 inches, 70W, probably made 2005
Probably yet another victim of Chinese made lead-free junk solder assembly
as it loses one channel intermittently.
Anyone familiar with these sort of tiny compact units ? any pitfalls ?as its

Hello everyone my Tektronix 2246 oscilloscope just went out on me
tonight. First it started making frequencies noises randomly, then it
took multiple tries to get it started. Now it just makes chirp and
doesn't start all together. I opened it up at looked at the power

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I have a new PC and it comes with a high pitch noise !  but it does
not occur all the time.
When I power up, I get the noise (more often than not). But if I reset
the PC a few times, it will go away.  But sometimes, when I power up,

Toshiba TLP-670U. I was given this projector from my boss with the warning
that it had stopped working for no good reason. I took it and it turns on,
projects light and a quick colour change as its booting but then it only
projects white light and I can't see any menus and ...

I am servicing a Peavey UA 35T II paging amplifier. The complaint is that
intermittently the mic input goes dead. I swapped out mic's but still the
same problem exists. There is a switch on the amp that according to the
owner's manual operates like this:

I've just bought a defective Russian suitcase nuke
on the black market. It seems to be a little bit rusted,
but the Plutonium inside smells ok.
How can I repair the suitcase nuke???

I am looking for a technician to repair my Radio in USA.
I have the manual and circuit diagram.
I velieve that is matter of ssignal tracer to retune all bobins.
thankyou.

I was asked to fix a Power Boss gas generator model 030220 on the frame
tag
Inside the generator motor back near the brushes and incoming wires is a
small circuit board with a semiconductor on it . The semicond. has a

Please help i fried my alphasonic amplifier i will do anything to
repair it please someone help me through decifering what the problem
could be ill pay please desperate