[TechAssist] Re: Zenith Projo Model A50M91W\9-1978 smps module

  • From: armando guerra <birdie@xxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Fri, 24 Jun 2005 11:29:24 -0700

Thanks Bob. Yes I really think its the generic flyback but I will check the tips
that you give here and go from there.
Mando
Birdie's TV & Electronics
Casa  Grande, AZ

Gemini Computer & TV wrote:

> I would suspect the flyback but...
>
> ---------------------------------------------------------------
> Text pasted from WinSTIPS 2.0
> http://www.ServiceSoftware.com
> ---------------------------------------------------------------
>
> ZENITH   9-1978
>
> Hv / Picture Jumps And Sound Snaps In Speaker / Module Replacement Caution
>
> Phil Hull
>
> After Replacing The Sweep Board 9-1978  With A New Board I Had The Above
> Symptom.  I Found Out That When I Removed The Hv Wire To The Hv Splitter The
> Little Spring Inside Fell Out And Now Did Not Hold The Hv Wire Tight Inside.
> Luckily I Found The Spring And Reinserted It.
>
> ---------------------------------------------------------------
> ---------------------------------------------------------------
> Text pasted from WinSTIPS 2.0
> http://www.ServiceSoftware.com
> ---------------------------------------------------------------
>
> ZENITH   A50M91W9
>
> Video Lost After 30 Min To 1 Hour / Audio Okay
>
> 95-4134-19 Generic Transformer Winding (Pin 6 To 10) Supplying The 16 Volts
> To The Convergence Board Opening Up.  Let The Set Cool And The 18 Volts
> Return. On The Last One It Loaded Down The Ps And I Lost The + & - Voltage
> For The Convergence Amps Which Comes From The Ps.  Parallel A 12k Resistor
> Across Rx3209 Which Solved Problem. Apparently Aftermarkets Have A
> Discrepancy  In Sampling Windings
>
> ---------------------------------------------------------------
>
> Bob Waterman, CET® #RI-28
> Master Technician License #9109
> Service Manager / Parts Manager
> Gemini Computer, TV, & Security Alarms
> (508)695-7302
> (508)695-7769 FAX
> geminitv@xxxxxxxxxxx
>
> ----- Original Message -----
> From: "armando guerra" <birdie@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, June 23, 2005 1:26 PM
> Subject: [TechAssist] Zenith Projo Model A50M91W\9-1978 smps module
>
> This set came in dead.On the smps (9-1978)module,I replaced the flyback
> (generic),the hot,CRX3412 (NTE580).Now set has a real nice pix for about
> an hour and than after warm up,the pix starts to pulsate or like
> blooming but just a few seconds and then goes back to normal.It does
> this about every 2 to 3 min.If you change channel,its ok for a few sec
> and then starts pulsing,shaking,blooming,hard to discribe.Like a
> regulation problem.I really think I got a bad generic flyback because I
> have had 3 bad ones before.
> This one came from a good source but its still a generic.Before I order
> another one,has anyone here come across this problem before?Maybe a bad
> lytic!The flyback is a 95-4134-19 I would apreciate any tips or
> idea's.Thanks.
> Mando
> Birdie's TV & Electronics
> Casa  Grande, AZ
> PS  What are the most common failure parts on this bd.Maybe I still have
> another bad one besides the 3 that I replaced.
>
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