[TechAssist] Re: Zenith SM2727RK - UPDATE
- From: "Chaz" <chaz@xxxxxxxxxxx>
- To: "C&W Electronics" <c_w_electronics@xxxxxxxxxxx>,techassist@xxxxxxxxxxxxx
- Date: Wed, 17 Oct 2001 23:38:12 -0500
Yep, this is true. That is also one reason I figure I'd just replace them
anyway since I will need to remove them to do a thorough circuit board
cleaning, particularly in the area closely affected.
Thanks for your input.
Chaz
-------
>
> Chaz,
> If you don't get all of the carbon cleaned off the ckt bd, your diodes will
> show leaky, when they may not be.
>
> Paul W
> C&W Electronics
>
>
> From: "Chaz" <chaz@xxxxxxxxxxx>
> Reply-To: techassist@xxxxxxxxxxxxx
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Zenith SM2727RK - UPDATE
> Date: Wed, 17 Oct 2001 22:31:38 -0500
>
>
> For all those following this thread: recently, I did a little more cleaning
> of the
> PCB to get a better viewing of previously described burnt parts. After
> doing
> so, discovered that the diodes - CR3431 to CR3434 - weren't, afterall,
> burnt.
> Just tarnished badly by the explosion from a TO-92 transistor - Q3431. My
> diode tester says they are bad.
>
> So, what I need is at least a partial schem of the section showing the above
> diodes, Q3431, ICX3431, and burnt resistor R3432. I will attempt a repair
> with replacement of these parts, depending on cost/avail. of STR53041,
> without CRT connected. If the board then functions, it gets my other CRT
> with it and hopefully returns to service. If not, this project will be
> dumped.
>
> Thanks to everyone who has offered suggestions so far and/or further
> continues to offer help.
>
> Thanks in advance.
> Chaz
> -------
>
> >
> > Late yesterday, I recieved a hi-fi Zenith TV that had been hit with
> lightning
> > (SM2727RK). I checked everything on Tech- Assist, even for close
> numbers,
> > and found nothing.
> >
> > Visual inspection shows blown FX3401 fuse, and what looks like the p.s.
> > bridge of diodes (burnt) close to the ICX3431 (I believe) STR????
> regulator. I
> > can't read anything on these diodes nor make out well the PCB location
> > descripts. I also suspect that the STR4400 (not able to read well
> either) volt-
> > reg is shorted - ohming it says so anyway. Without knowing what these
> > parts are, and resourcing cost of regulator, I can't do much with it
> right now
> > w/o chancing more part damage. Customer wants it fixed but also is a
> little
> > short on budget. Anyone have any ideas, schem, or tips on this. Part
> > descriptions would be a big help to start with.
> >
> > I'm not sure of the chassis number for this but, the only label I found
> in the
> > unit shows SM2727Rk EU-593 F49702 (numbers under each other).
> >
> > Customer had said before it got hit with lightning, that the video would
> go out
> > (white screen) and after powering off to cool down, the video would
> appear
> > again. He said he "just lived with it until this happened".
> >
> > Thanks in advance.
> > Chaz
> > Help make your TechAssist online repair tips
> > database better! Submit your fixes here:
> > http://www.circuitwork.com/techassist/tip/#tips
> > To unsubscribe write to:
> > techassist-request@xxxxxxxxxxxxx
> > with unsubscribe in the subject line.
> >
> >
>
>
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