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

To: tv@xxxxxxxxxxxxxxx
Subject: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
From: Bill Grabowski <bgrabowski@xxxxxxxxx>
Date: Wed, 06 Apr 2005 20:24:35 -0500
In-reply-to: <BAY106-F229E34F2BA46555F141B67B23E0@phx.gbl>
References: <BAY106-F229E34F2BA46555F141B67B23E0@phx.gbl>
Reply-to: tv@xxxxxxxxxxxxxxx
Sender: tv-bounce@xxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7.2) Gecko/20040804 Netscape/7.2 (ax)
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
>>>>>>>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>>>>>>>-------------------------------------------------------------------------------
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>_________________________________________________________________
>>>>>>>>Don’t just search. Find. Check out the new MSN Search!
>>>>>>>>http://search.msn.click-url.com/go/onm00200636ave/direct/01/
>>>>>>>>
>>>>>>>>-------------------------------------------------------------------------------
>>>>>>>>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
>>>>>>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>>>>>>-------------------------------------------------------------------------------
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>-------------------------------------------------------------------------------
>>>>>>>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
>>>>>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>>>>>-------------------------------------------------------------------------------
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>_________________________________________________________________
>>>>>>Express yourself instantly with MSN Messenger! Download today - it's
>>>>>>
>>>>>>
>>>>
>>>>FREE!
>>>>
>>>>
>>>>
>>>>>>http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>>>>>>
>>>>>>-------------------------------------------------------------------------------
>>>>>>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
>>>>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>>>>-------------------------------------------------------------------------------
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>-------------------------------------------------------------------------------
>>>>>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
>>>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>>>-------------------------------------------------------------------------------
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>-------------------------------------------------------------------------------
>>>>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
>>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>>-------------------------------------------------------------------------------
>>>>
>>>>
>>>>
>>>
>>>_________________________________________________________________
>>>Express yourself instantly with MSN Messenger! Download today - it's 
>>
>>FREE!
>>
>>>http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
>>>
>>>-------------------------------------------------------------------------------
>>>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
>>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>>-------------------------------------------------------------------------------
>>>
>>>
>>>
>>
>>-------------------------------------------------------------------------------
>>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
>>TV email Archives at: http://www.circuitwork.com/archive/TV/
>>-------------------------------------------------------------------------------
>>
> 
> 
> _________________________________________________________________
> Don’t just search. Find. Check out the new MSN Search! 
> http://search.msn.click-url.com/go/onm00200636ave/direct/01/
> 
> -------------------------------------------------------------------------------
> 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
> TV email Archives at: http://www.circuitwork.com/archive/TV/
> -------------------------------------------------------------------------------
> 
> 

-- 
*****************************
Bill Grabowski
Triangle Appliance
Kenosha,Wi 53142
262-694-6500
262-694-6523 fax
bgrabowski@xxxxxxxxx
*****************************
-------------------------------------------------------------------------------
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
TV email Archives at: http://www.circuitwork.com/archive/TV/
-------------------------------------------------------------------------------
Follow-Ups:
- [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
  - From: John Conti
References:
- [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
  - From: John Conti
Prev by Date: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
Next by Date: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
Previous by thread: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
Next by thread: [TV] Re: Zenith PVR5263RK - Need service manul and/or advice
Index(es):
- Date
- Thread