[TechAssist] Re: Zenith Projo Model A50M91W\9-1978 smps module
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 24 Jun 2005 10:24:19 -0400
I would suspect the flyback but...
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Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
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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.
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Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
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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
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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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