Videokarma.org

Go Back   Videokarma.org TV - Video - Vintage Television & Radio Forums > Vintage TV & Radio Tech Forum

We appreciate your help

in keeping this site going.
Reply
 
Thread Tools Display Modes
  #1  
Old 08-28-2018, 05:51 PM
flyrihght flyrihght is offline
VideoKarma Member
 
Join Date: Aug 2018
Posts: 3
Magnavox T989 chassis flyback

I am in search of magnavox flyback #361499. t989 chassis r313 1200 ohm resister opened. replaced with tripler disconnected and no hv. seems like there is drive. be glad to pay shipping on a whole chassis. i may have to get back in there and troubleshoot that d board. any tips?
Attached Images
File Type: jpg d board drive circuit.jpg (120.0 KB, 21 views)
File Type: jpg output circuit.jpg (125.7 KB, 15 views)
Reply With Quote
  #2  
Old 08-29-2018, 11:31 AM
zeno's Avatar
zeno zeno is offline
VideoKarma Member
 
Join Date: Mar 2013
Location: New Hampshire
Posts: 4,672
Some of these FBT's plugged in. The connections would toast up.
Also the mother board & module connectors went cold a lot. Dont
forget the frame grounds....
It doesnt show one but this is about the time they switched to
4-lead caps. An open leg will kill the HV.
The SCR is for HVSD. Pull it to eliminate BUT use a variac, you may
have too much HV. Start it at abt 70VAC.
With the tripler input unhooked you should get a healthy 1/2" arc
at the FBT out. These were not FBT eaters. Only ones I changed
were badly burned from the bad connections.

73 Zeno
LFOD !
Reply With Quote
  #3  
Old 08-30-2018, 09:39 PM
flyrihght flyrihght is offline
VideoKarma Member
 
Join Date: Aug 2018
Posts: 3
thank you

I will check these suggestions and let you know results
Reply With Quote
  #4  
Old 08-31-2018, 09:48 PM
bgadow's Avatar
bgadow bgadow is offline
VideoKarma Member
 
Join Date: Oct 2003
Location: Federalsburg, MD
Posts: 5,814
I checked the Thordarson number, looks like their part # FLY-462. I didn't see on in my stash.
__________________
Bryan
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 12:31 PM.



Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
©Copyright 2012 VideoKarma.org, All rights reserved.