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. > > ---------------------------------------------------------------------------- > - > This Email List is Public. Remove: http://www.tech-assist.org/remove.htm > Set Vacation > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation > Lost Password: http://www.tech-assist.org and select "Login Problems?". > Email Archives: //www.freelists.org/archives/techassist/ > > ----------------------------------------------------------------------------- > This Email List is Public. Remove: http://www.tech-assist.org/remove.htm > Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation > Lost Password: http://www.tech-assist.org and select "Login Problems?". > Email Archives: //www.freelists.org/archives/techassist/ ----------------------------------------------------------------------------- This Email List is Public. Remove: http://www.tech-assist.org/remove.htm Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation Lost Password: http://www.tech-assist.org and select "Login Problems?". Email Archives: //www.freelists.org/archives/techassist/