Re: How picky are power transitors ?

From: James Sweet (jamessweet_at_hotmail.com)
Date: 12/05/04 

Date: Sun, 05 Dec 2004 08:29:04 GMT

"jmuller" <jmuller@gil.com.au> wrote in message
news:41b2befc$0$3077$61c65585@uq-127creek-reader-03.brisbane.pipenetworks.com.au...
> jmuller wrote:
> > I have a couple of dead monitors (little 15" ones) which seem to have
> > the same problem. :(
> >
> > Dead power transitor.
> >
> > They have both short-circuited.
> > One is marked:
> >
> > T
> > K2038
> > '41
> >
> > My question is:
> >
> > How hard would it be to find a substitute for it? Are they pretty much
> > generic? Would any high current (5A) transitor do?
> >
> >
> >
> > - - thanks in adavnce,
> >
> > -- jmuller.
>
> Also out of circuit there is a short between where the outer legs used
> to be. Is this normal?
>
> The monitor says that these aren't often transistors but "expensive"
> mosfets. What's the chances of replacing these and how expensive?

Look up the numbers on the cross reference on www.nteinc.com and compare
specs. I believe you're referring to the horizontal output transistor, these
can usually be subbed, but they're special high voltage (as in 1400v or so)
high current transistors usually. The "short" on the board is often normal,
caused by an inductor which has a low DC resistance. Often a HOT will also
appear shorted because of the internal damper diode or resistor but you
should be able to test two good diode junctions.