[TechAssist] Re: Zenith SM2727RK - hit by lightning (dead set)

You can change how the crt filaments gets its voltage by doing a wire wrap
of the IHVT and cutting the old leads.
it does work and should also explain to customer you saved the crt.
fuzzzzzzz
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Cc: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, October 17, 2001 9:37 AM
Subject: [TechAssist] Re: Zenith SM2727RK - hit by lightning (dead set)



Chaz,

I had an 8th grade English teacher with a sign on the chalkboard which
read: "Fail now.  Avoid the June rush."  I will adapt that to say to you:
 Bail now.  Avoid losing your shirt.

There is every indication that the crt has been giving problems for some
time ("The video would go out (white screen) and after powering off to
cool down, the video would appear again.")  The customer MAY have been
hit by lightning, but a better chance the crt took out the p/s.  At any
rate, if you fix the chassis, it will come back to bite you.


Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL  32561
850-934-8324 (Voice) 850-932-0819 (Fax)

---------------------

On Tue, 16 Oct 2001 23:12:10 -0500 "Chaz" <chaz@xxxxxxxxxxx> writes:
>
> 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
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