Re: Magnavox FP5230 repair

In article <eEDBf.52$Vr.21@xxxxxxxxxxxxxxxxxxxx>,
rockobonaparte@xxxxxxxxxxx says...
> Bill, I think you're my new messiah:

Just happen to have seen a few of these in my employment at
a (former) Magnavox dealer.

> I was told flyback transformers are the common thing to go on
> televisions in general.

Twenty KV plus is rough service even for parts designed for it.

> Are you saying this transistor, that fuse resistor, and the
> transformer are likely the things to change?

High probability, yes.

> I know it goes OT, but what kind of iron do you recommend then?

Probably not what you want to hear, but I use a dedicated desoldering
tool, Pace MP-1 that cost several hundred. It has hollow tips and
built-in vacuum pump. Hard to justify the cost for occaisional jobs
like you're doing, but well worth it when you do this sort of thing
nearly every day. I think Ungar made a lower-cost squeeze bulb type
of tool, which I haven't tried, think maybe Weller owns this design
now.

> > And let us know when you get to removing the HV wire from the old
> > flyback, it's a bit tricky too.
>
> I see some stuff in the FAQ about it. I have to get myself a few high
> watt, mega ohm resistors. I'm hoping if I leave it unplugged a few
> days, it will only mildly kill me as oppose to completely free me.

The focus/screen control block has a built-in bleeder resistor, so if
it has been off for a few minutes the HV is already bled away. I've
never had one of these bite me (unlike normal TV's). I was referring
to the mechanics of the clip that holds the HV wire into the flyback.
I think maybe the replacement flybacks come with a new clip nowadays.
.

Relevant Pages

  • NAP PTV 5/6/7XX flybacks
    ... The extra pin on the flyback, ... below and just solder the wire in. ... Within two raster lines all the way to the edges. ...
    (sci.electronics.repair)
  • Re: GO7 B+ low
    ... The reason I mentioned the flyback and HOT is because they were both changed ... Monitor has a cap kit, new flyback, and new HOT. ... with the same resistor going bad. ... the pot turned aobut 3/4's of the way open. ...
    (rec.games.video.arcade.collecting)
  • Re: current sensors for high frequency converters
    ... of a flyback converter.Operating frequency ... It's common to use a current transformer, ... especially since the switch current must ... It's also common to put in a resistor ...
    (sci.electronics.design)
  • Re: GO7 B+ low
    ... Monitor has a cap kit, new flyback, and new HOT. ... I sent you a flow chart that should ... same resistor going bad. ... pot turned aobut 3/4's of the way open. ...
    (rec.games.video.arcade.collecting)
  • Re: Monitor IBM, Chassis: CM2617 ( CM2600)
    ... sounds like a telltale for a bad flyback. ... id' which leads you to a page where you can most times reconstruct the old ... values of a non-carbon film resistor with the burned ones. ... | Have this IBM monitor which does not power up. ...
    (sci.electronics.repair)
Quantcast