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Main => Monitor/Video Forum => Topic started by: rholdenl on March 26, 2015, 06:56:09 pm

Title: Repairman replaced my flyback, but why did he do this?
Post by: rholdenl on March 26, 2015, 06:56:09 pm: http://imgur.com/a/GdDIm (http://imgur.com/a/GdDIm)

I have a strange wave in my screen and I think this may be the reason. Can anyone shed some light on the possible reasons for doing this? Should I undo it to fix the wave in the screen?
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: pbj on March 26, 2015, 06:59:57 pm: Lol holy crap. I thought that was an urban legend.

:laugh2:
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: rholdenl on March 26, 2015, 07:03:42 pm: Quote from: pbj on March 26, 2015, 06:59:57 pm
Lol holy crap. I thought that was an urban legend.

:laugh2:

What do you mean?

The flyback is a DNF-FL2701
and the chassis is a CGM2500

That would probably help.

Here's pictures of the original schematic vs changes made by the repair man.
https://imgur.com/a/iD21u
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: jennifer on March 26, 2015, 10:51:58 pm: Apparently he made a homemade ferrite coil (The wires wrapped around that magnet), That very well could be your problem.
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: ed12 on March 26, 2015, 11:03:10 pm: it was used to boost heater current/voltage
was called a :booster: in it's day
means the fly-back is wrong ? / not providing proper voltage/current
or the tube is gunning down
in short it is a way to boost the tube

out come is not good for the tube

ed
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: rholdenl on March 26, 2015, 11:15:04 pm: Do you guys think it would harm anything to undo it, fix the traces, and fire it up? What should the voltage be normally?
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: Ken Layton on March 26, 2015, 11:18:59 pm: That mod was done because your tube has a short in it that could not be removed with a rejuvenator. This mod isolates the tube filaments from ground. This is a common way to save a bad tube.

I've done this many times.
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: ed12 on March 26, 2015, 11:29:05 pm: to many times
tube is toast

ed
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: jennifer on March 26, 2015, 11:40:14 pm: **I bet my Beltron could blow some chunks out of that tube** Ken that's an interesting take,( never tried that) wouldn't that require a swamp to stabilize the circuit? But to me Id still be thinking, Magnetic interference, or the underpowered fly back given the problem manifests itself in waves.... OP: Finding out if that's the right coil for that tube would be a good place to start.
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: rholdenl on March 26, 2015, 11:47:47 pm: According to this website, it's the right one for the chassis.

http://www.arcadecup.com/ (http://www.arcadecup.com/)
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: ed12 on March 26, 2015, 11:54:08 pm: it is this simple

the tube is bad
the tube is bad

ed
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: jennifer on March 26, 2015, 11:55:55 pm: +1
+1
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: rholdenl on March 27, 2015, 01:04:24 am: Well, thank you guys for the help. It looks like I'll be getting a scanline generator and a 25" LCD.
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: pbj on March 27, 2015, 11:32:59 am: I read about people supposedly doing that right before they dragged a game with a dim tube to Super Auctions 15 years ago but I didn't think anyone actually bothered.

Isolating the filaments from ground is a new one on me, but I'll defer to Ken's experience.
Title: Re: Repairman replaced my flyback, but why did he do this?
Post by: jennifer on March 27, 2015, 12:44:51 pm: I would imagine a brightener is the same come concept.