[TV] Re: Zenith PVR5263RK - Need service manul and/or advice

["John Conti" <contitv@xxxxxxxxxxx>]

Bill, Do you have the model # and maybe the board # to the sweep/horz. and 
convergence board.
John
l
>From: Bill Grabowski <bgrabowski@xxxxxxxxx>
>Reply-To: tv@xxxxxxxxxxxxxxx
>To: tv@xxxxxxxxxxxxxxx
>Subject: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
>Date: Wed, 06 Apr 2005 20:24:35 -0500
>
>Has anyone supplied the proper setup and adjustment for the convergence
>of this model. I to am having problems setting the out side edges, have
>bowing and just can't seem to get the entire pincussion to lap over all
>three guns. This is a C8 chassis. Thanks!!
>
>Bill Grabowski
>Triangle Appliance
>Kenosha,  Wi  53142
>
>John Conti wrote:
>
> > Rick. on the 5% resistors, you cant go wrong. Thats usually whats in 
>there.
> > john
> >
> >
> >>From: Rick <rick@xxxxxxxxxxxxxxxxxx>
> >>Reply-To: tv@xxxxxxxxxxxxxxx
> >>To: tv@xxxxxxxxxxxxxxx
> >>Subject: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
> >>Date: Wed, 06 Apr 2005 17:25:27 -0700
> >>
> >>Thank you everybody who suggested this. I pulled the 120k resistor on
> >>the blue crt board and it was indeed up around half a meg.
> >>The other two were OK but since I took them out to check I just put new
> >>ones in.
> >>
> >>It looks like the original resistors were high tolerance. I only had
> >>1/2W 5% carbons on hand so those are what I used as replacements.
> >>Is the tolerance critical on these parts or am I OK?
> >>
> >>Next I think I am ready to attempt to converge the CRTs. Any tips on
> >>this process would be welcome. This is the first PTV I've
> >>repaired so this will also be my first time trying to converge. I have
> >>test patterns on the Video Essentials DVD including:
> >>Dots (both dense and not so dense), overscan, Snell & Wilcox, pluge,
> >>color bars, and a few others. I don't think I have not yet found
> >>a plain-jane crosshatch pattern but I have found a few lined patterns
> >>that look like they will do.
> >>
> >>Thanks,
> >>Rick
> >>
> >>John Conti wrote:
> >>
> >>
> >>>Rick, On the something wrong with the blue. look on the blue crt board
> >>
> >>and
> >>
> >>>check or replace r5102
> >>>(120k 1/2w) its either getting high in res. or getting ready to open. 
>you
> >>>might also replace the ones on the red and green crt boards or they'll
> >>
> >>come
> >>
> >>>back to haunt you later.
> >>>John
> >>>
> >>>
> >>>
> >>>
> >>>>From: Rick <rick@xxxxxxxxxxxxxxxxxx>
> >>>>Reply-To: tv@xxxxxxxxxxxxxxx
> >>>>To: tv@xxxxxxxxxxxxxxx
> >>>>Subject: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
> >>>>Date: Wed, 06 Apr 2005 03:01:49 -0700
> >>>>
> >>>>OK everyone, here is an update: Some things fixed, some things 
>possibly
> >>>>not right...
> >>>>
> >>>>I took John's advice (below) and checked the voltage at the diodes. 
>The
> >>>>mess was still there
> >>>>on the -26v diode so I replaced the diode and filter cap. The set was
> >>>>stable for a long time. I thought
> >>>>the problem was solved but eventually the "bounce" came back.
> >>>>
> >>>>I decided to check the +26v side and noticed that the convergence 
>board
> >>>>was not getting +26v, but it was
> >>>>there at the diode. Blown fuse on the +26v supply. I hadn't noticed it
> >>>>before because the glass window was
> >>>>covered with a blob of adhesive. I determined that dead side of the 
>fuse
> >>>>wasn't grounded out and jumped it with
> >>>>a fused ammeter to see what would happen. Current through the meter 
>was
> >>>>not high so I jumped the blown fuse with
> >>>>a wire. Of course now the convergence POTs have significant affect on
> >>>>the TV compared with before. Also,
> >>>>the odd pulsating has not returned on the -26v supply. I let the TV 
>warm
> >>>>up for quite some time and all seems well.
> >>>>There does seem to be some noise on the +26v supply, however, so I 
>will
> >>>>replace it's filter cap.
> >>>>
> >>>>There's something up with BLUE, maybe someone has seen this before.
> >>>>When I pull up a PIP box or the menu, blue is missing from the 
>vertical
> >>>>lines of any borders/boxes.
> >>>>If I go to the convergence adjustment setting in the menu, the two
> >>>>vertical lines are not white because there is very
> >>>>little blue in them. If I then turn off the red and green CRTs the
> >>>>vertical lines for blue are tiny slivers compared to the
> >>>>thick lines of R and G. Also on this menu all the text at the top
> >>>>("Press FREEZE to select the color...") is in blue only and
> >>>>is virtually unreadable because of the lack of vertical blue lines.
> >>>>
> >>>>Thanks everyone, I'll keep you posted...
> >>>>
> >>>>-Rick
> >>>>
> >>>>rick@xxxxxxxxxxxxxxxxxx wrote:
> >>>>
> >>>>
> >>>>
> >>>>
> >>>>>Thanks John,
> >>>>>
> >>>>>-26v is the line that pulsates.  I looked at it on the scope last 
>night
> >>>>>and it looks like it drops to ground potential for a split second, 
>then
> >>>>>quickly rises back up and repeats.
> >>>>>
> >>>>>I will check the diode and perhaps filter cap esr and post results.
> >>>>>
> >>>>>Thanks,
> >>>>>Rick
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>
> >>>>>>Rick, I'm sending this message again because I don't think it went
> >>>>>>through.
> >>>>>>But all I have left on this one is to check cr3419 and cr3420 and 
>make
> >>>>>>sure
> >>>>>>you have a clean waveform. This is you + & -
> >>>>>>26volts for convergence. somtimes these diodes break down under a 
>load
> >>>>>>
> >>>>>>
> >>>>
> >>>>or
> >>>>
> >>>>
> >>>>
> >>>>>>the filters get dry and do not filter right and there is ripple.
> >>>>>>good luck on this one
> >>>>>>john
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>
> >>>>>>>From: Rick <rick@xxxxxxxxxxxxxxxxxx>
> >>>>>>>Reply-To: tv@xxxxxxxxxxxxxxx
> >>>>>>>To: tv@xxxxxxxxxxxxxxx
> >>>>>>>Subject: [TV] Re: Zenith PVR5263RK - Need service manul and/or 
>advice
> >>>>>>>Date: Mon, 04 Apr 2005 19:07:32 -0700
> >>>>>>>
> >>>>>>>No dice...
> >>>>>>>I pulled the two resistors and checked them out-of-circuit. They 
>were
> >>>>>>>within tolernce and physically look as good as new.
> >>>>>>>Just to be sure, I measured resistance while accosting them with a
> >>
> >>heat
> >>
> >>>>>>>gun (not a hair dryer, but a real heat gun).
> >>>>>>>They both held up remarkably well.
> >>>>>>>
> >>>>>>>Thanks for the suggestion!
> >>>>>>>
> >>>>>>>John Conti wrote:
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>Rick, on the 9-1302 check two resistors, they are r3243 (110k 1/2
> >>
> >>watt
> >>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>and
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>r3244 (82k 1/2 watt)
> >>>>>>>>they either change values or open up. They are located next to the
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>upright
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>board that stands vertical. I think your having the same problem
> >>
> >>that
> >>
> >>>>>>>>
> >>>>I
> >>>>
> >>>>
> >>>>
> >>>>>>>>
> >>>>>>>had
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>a few months ago and if so, drove me crazy before I located the
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>problem.
> >>>>>>>Let
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>me know how you came out on this, for if thats the problem it will
> >>>>>>>>
> >>>>>>>>
> >>>>
> >>>>sure
> >>>>
> >>>>
> >>>>
> >>>>>>>>
> >>>>>>>save
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>others a lot of time.
> >>>>>>>>
> >>>>>>>>good luck
> >>>>>>>>john
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>>From: Rick <rick@xxxxxxxxxxxxxxxxxx>
> >>>>>>>>>Reply-To: tv@xxxxxxxxxxxxxxx
> >>>>>>>>>To: TV@xxxxxxxxxxxxxxx
> >>>>>>>>>Subject: [TV] Zenith PVR5263RK - Need service manul and/or advice
> >>>>>>>>>Date: Mon, 04 Apr 2005 15:14:05 -0700
> >>>>>>>>>
> >>>>>>>>>Hello, I have a Zenith 52" rear projection TV.
> >>>>>>>>>Would somebody please help me obtain a service manual or 
>schematics
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>>>for
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>>this TV?
> >>>>>>>>>I have tried from a couple of places but met dead ends.
> >>>>>>>>>
> >>>>>>>>>The problem I am having is hard to explain but I will do my best.
> >>>>>>>>>
> >>>>>>>>>What follows is a long account of everything I have observed and
> >>>>>>>>>
> >>>>>>>>>
> >>>>
> >>>>tried
> >>>>
> >>>>
> >>>>
> >>>>>>>>>so far.
> >>>>>>>>>
> >>>>>>>>>First the convergence is way out of whack and although I get 
>slight
> >>>>>>>>>movement
> >>>>>>>>>when adjusting the POTs on the convergence board, it's nowhere 
>near
> >>>>>>>>>enough to
> >>>>>>>>>bring it back into whack =)
> >>>>>>>>>
> >>>>>>>>>Second, after the TV warms up, the voltage supplied to the
> >>>>>>>>>
> >>>>>>>>>
> >>>>
> >>>>convergence
> >>>>
> >>>>
> >>>>
> >>>>>>>>>board and convergence amplifier
> >>>>>>>>>(same circuit) becomes "unstable."  On a scope the line
> >>
> >>representing
> >>
> >>>>>>>>>this DC voltage will begin to bounce slowly
> >>>>>>>>>at first, then more rapidly (up to 2 or 3 times per second) and 
>the
> >>>>>>>>>amplitude of this oscillation increases.
> >>>>>>>>>
> >>>>>>>>>Since this distortion is in the convergence circuit, it manifests
> >>
> >>as
> >>
> >>>>>>>>>picture movement on the screen and affects all three
> >>>>>>>>>CRTs.  As the TV warms up and the voltage begins to drift, the 
>top
> >>
> >>of
> >>
> >>>>>>>>>the screen will bow down then bounce in time
> >>>>>>>>>with the fluctuating voltage.
> >>>>>>>>>
> >>>>>>>>>I visually inspected all components, especially resistors, and 
>did
> >>>>>>>>>
> >>>>>>>>>
> >>>>
> >>>>not
> >>>>
> >>>>
> >>>>
> >>>>>>>>>find any obviously burned or otherwise expired components.
> >>>>>>>>>Next I took a can of air used it to cool parts in suspect places.
> >>
> >>I
> >>
> >>>>>>>>>found a couple transistors and a resistor, all near each other,
> >>
> >>that
> >>
> >>>>>>>>>when cooled slowed or even stopped the strange voltage 
>fluctuation.
> >>>>>>>>>Next I replaced the parts thinking they may have tired out, but 
>the
> >>>>>>>>>problem persists.  Now I suspect too much current is going 
>through
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>>>that
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>>section of the circuit for whatever reason and blowing air over 
>the
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>>>PCB
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>>only cures the symptom, not the underlaying problem.
> >>>>>>>>>
> >>>>>>>>>The front convergence board with the POTs has a Disable jumper to
> >>>>>>>>>disable the convergence correction.  Setting this jumper will
> >>>>>>>>>immediately stop the voltage oscillation.  Upon re-enabling the
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>>>jumper,
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>>the voltage will be stable for a few seconds and then ramp back 
>up
> >>
> >>to
> >>
> >>>>>>>>>full oscillation.
> >>>>>>>>>
> >>>>>>>>>Disconnecting just the BLUE input to the convergence amplifier 
>will
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>>>stop
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>>the bouncing and then the red and green convergence adjustments
> >>
> >>have
> >>
> >>>>>>>>>much more effect on the picture than with the blue input 
>connected.
> >>>>>>>>>
> >>>>>>>>>Disconnecting the output coils of any of the RGB amplifiers stops
> >>
> >>the
> >>
> >>>>>>>>>bouncing but probably only because of reduced current draw 
>through
> >>>>>>>>>
> >>>>>>>>>
> >>>>
> >>>>the
> >>>>
> >>>>
> >>>>
> >>>>>>>>>whole system.
> >>>>>>>>>
> >>>>>>>>>I replaced the STKs which solved nothing, but neither did it 
>break
> >>>>>>>>>anything.
> >>>>>>>>>
> >>>>>>>>>At this point I feel like I'm just shooting in the dark (and
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>
> >>>>>>>especially
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>
> >>>>>>>>>without a schematic).
> >>>>>>>>>Somebody please help!
> >>>>>>>>>
> >>>>>>>>>-Rick
> >>>>>>>>>-------------------------------------------------------------------------------
> >>>>>>>>>To remove yourself DO NOT Email TV@xxxxxxxxxxxxxxx you MUST email
> >>>>>>>>>TV-REQUEST@xxxxxxxxxxxxxxx with REMOVE as the subject.
> >>>>>>>>>Sent VIA Tech Assist's email server- tv@xxxxxxxxxxxxxxx
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> >>>>>>>>>-------------------------------------------------------------------------------
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>>
> >>>>>>>>
> >>>>>>>>_________________________________________________________________
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> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>>
> >>>>>>>
> >>>>>>>-------------------------------------------------------------------------------
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> >>
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> >>
> >
> >
> > _________________________________________________________________
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> > 
>-------------------------------------------------------------------------------
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>-------------------------------------------------------------------------------
> >
> >
>
>--
>*****************************
>Bill Grabowski
>Triangle Appliance
>Kenosha,Wi 53142
>262-694-6500
>262-694-6523 fax
>bgrabowski@xxxxxxxxx
>*****************************
>-------------------------------------------------------------------------------
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