Re-Using flybacks. When is it a good/bad idea?

Mongo

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I like to keep things simple when I work on a game so I live by many "rules of thumb". Among them are things like: If you are going to pull a monitor chassis for repair, unless the monitor is pretty darn new, cap it. If you are capping a G07, replace the flyback and HOT or you will be pulling the chassis again soon. And that brings me here now to see what others think about when to replace a flyback or to re-use a used flyback when working on a monitor. Here is where I currently stand and why:

Electrohome G07 = always replace with new. For less than $20 you won't have to pull the monitor again.

Wells Gardner 4600 = Leave alone or replace with used. I have only ever seen one fail.

Wells Gardner 4900 = Leave alone or replace with used. I have never seen one of these fail.

Wells Gardner 7000 = Replace with new. Even working ones seem to have problems with cracks in the voltage control assembly.

Electrohome G08 = No replacement available.

Wells Gardner 6100 = I have no opinion at this point.

Sanyo 20 EZV = I have no opinion at this point.

Cinematronics = I have no opinion at this point.

Amplifone = replace regardless of cost.

Wells Gardner U2000 - 5000 = Replace if you can afford a $100 flyback. Working ones tend to develop focus problems.

NeoTec = Only replace if bad.

Anyone else have experience dictate that different rules of thumb should be observed?
 
I agree. But if it did NOT work, would you be OK with a used one you had on-hand or would you order and wait for a new one?
 
Other than the G07, there isn't a monitor that I personally wouldn't feel comfortable with a used flyback. Now if a new one is available then I'd likely just buy it just to be safe. For a K7000 I don't worry unless I see the cracking that you mentioned, or if it's the variety with the white adjustment knobs. Now I don't claim at all to be a monitor repair genius and I'm basing my opinions on what experience I do have with repairing them.
 
i have a 4900 now that works but to me looks like it's losing it's focus. since i'm going to resell this on feebay do i..

A. sell it as a working, recapped chassis
B. replace the flyback, then sell as a working, recapped chassis
C. sell as partially working.
 
When you said 're-use', I figured you meant saving a working flyback from a rebuild that included a new one.

As for keeping an original flyback in, the only one I replace during a rebuild even when it looks perfect is the G07. On the K7000, it depends on which flyback it is (white knobs usually get replaced) and whether it has cracks in it it (no cracks and working means I leave it).

Other than those, I don't change out a flyback unless I have problems related to it, and my ring tester confirms it is bad - or if the customer requests it to be changed "just because"...
 
Thanks for all of the input. Looks like most of us are in agreement. I guess what would have made more sense is the question: "When is a working used original flyback preferable to the new reproductions available?". So far it looks like only the G07 falls into the category of being a "replace no matter what".
 
i'd replace a K7000 flyback with a new one before reusing an older one... most of the K7000's i've picked up either had a bad fly or the fly went bad not long after i bought it, and they run about the same as the GO-7's.
 
I've done several G07's over the years and never replaced the fly backs when doing a Cap Kit and they are still going strong.
 
I've done several G07's over the years and never replaced the fly backs when doing a Cap Kit and they are still going strong.

Dude.....you just invoked the anger of the flyback gods. Prepare to have a room filled with smoke. Some g07's have had their flyback replaced before but if it is original, I replace it and sell the used working ones to a guy that likes to tempt fate. I learned the hard way. After changing my third flyback after doing a capkit, I decided to just replace the flyback. G07's are notorious for failing shortly after a cap kit.
 
Hmm I always thought you had to replace the flyback for any chassis with new caps. Here I been bugging my friend bout buying a new one for his Sanyo 20ez and it's probably alright. Good thing he refused.
 
Nope. Flybacks are not always a "must replace" item. The Wintron flyback used on Amplifone monitors has had NO reports of a failure... EVER. G07s are notorious (as stated above) of failing shortly after a cap kit if they are originals. The Sanyo 20 EZV is more notorious for "singing" (high pitched vibrations) than for failing... but they do fail... but not terribly often.
 
Hello,
I would like a little education about flybacks. Here is a 6100 flyback that the clip broke. Does this matter or is it there only to hold the two (magnets) together? I noticed on the newer flybacks the clips do not wrap all the way around.

Also what is the purpose of the (magnet)? It does not seem to have any attraction between the two pieces. I have never taken apart a transformer before, but I figured that the magnet that the copper wiring wraps around is attractive.

I am guessing that there is wire wrapping around this in the plastic flyback case but I really have no idea.

Thanks for any education.
 

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Thanks for all of the input. Looks like most of us are in agreement. I guess what would have made more sense is the question: "When is a working used original flyback preferable to the new reproductions available?". So far it looks like only the G07 falls into the category of being a "replace no matter what".

Possibly. I'm fixing to create a new post asking about this, but the original flybacks typically have a label with a green stripe. I recently ran across one with a different label (still original) so am not sure whether it MUST be replaced...
 
Thats not a magnet, its a ferrite core. Thats what transformers use to help conduct magnetic force beteen the primary and secondary coils.. Air works.. but iron works much better.
 
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