CTX 19” CRT Monitor Blurry Display

[mikecebu]

I have this faulty monitor and I was thinking instead of disposing it maybe I can try my luck to repair it through some help from electronic enthusiast around here. Actually, this monitor is quite old a 19” CTX Flat Screen but unfortunately got trouble in the display which was blurry display. I was trying figured it before by re-adjusting the tune at the flyback but to no avail. I think it was the best shot from the flyback yet blurry output. I'm just crossing my fingers that someone could help me out. Thank you

I also attached some actual shots from the display.

[Wizard]

Re: CTX 19” CRT Monitor Blurry Display

Convergence. This usually means failed yoke, not replaceable on 1 RGB CRT. I had this happen often on philips TVs.

Convergence are *not* adjusteable on 1 RGB CRT stuff, yes on some sony (especially high end) and any projection 3 CRT type.

Cheers, Wizard

[mikecebu]

Re: CTX 19” CRT Monitor Blurry Display

thanks for quick response. So does it means no chance at all?
Actually when i check the Picture tube the model was Samsung.

[kc8adu]

Re: CTX 19” CRT Monitor Blurry Display

bad focus that far out will also have bad convergence.
samsung crt says it all.recycle it its done.
anything,even a chungwha is better than samsung when it comes to crt's.
one last thing you can try is to ground a screwdriver with a cliplead.
pull the socket.
power up the monitor and while live ground the focus pins.they are walled off from the rest.if you get a nasty snap it means you may have cleared the leakage.you will have to readjust the focus.
otherwise its junk.focus network in the fly will look like that too.

[kc8adu]

Re: CTX 19” CRT Monitor Blurry Display

Convergence. This usually means failed yoke, not replaceable on 1 RGB CRT. I had this happen often on philips TVs.

Convergence are *not* adjusteable on 1 RGB CRT stuff, yes on some sony (especially high end) and any projection 3 CRT type.

Cheers, Wizard

maybe on rca/thompson stuff with permalloy tape and glued yoke.
static convergence on anything else is adjusted with that group of rings at the rear of the yoke.but the focus on that one is very bad which throws convergence too.bad yoke will have severe geometry problems and often burns stuff out.
i swap crt's yokes, and reconverge these every day.
since you cannot buy a new one to match the chassis and customer writes a blank check and says fix it swapping the original yoke to a compatable crt is how its done.
this is on industrial stuff though.consumer stuff goes on the recycle pile.

[Wizard]

Re: CTX 19” CRT Monitor Blurry Display

I see.

Sigh. Truth on that RCA CRTs...! :P If convergence or yoke failed, but tube is GOOD. Agggh!

Cheers, Wizard

[kc8adu]

Re: CTX 19” CRT Monitor Blurry Display

I see.

Sigh. Truth on that RCA CRTs...! :P If convergence or yoke failed, but tube is GOOD. Agggh!

Cheers, Wizard

i just break/peel the yoke off.
i put a rca a68 tube in a neighbors 27" zenith/bose fancy console with built in vcr.
rca was lightning hit when 1 month old.
they put it in the barn.
the tube in the zenith was a crappy rebuilt that sucked from day 1.
never could get good focus on it.
well it shorted and i looked at the rca.hmm same pinout,deflection angle,ect.
well it went right in after dremel work on the mounting lugs.
tore off the yoke.set it up and they said it looked better now than when it was new.it got perfect convergence,purity and greyscale.
if it were something that didnt have sentimental value to them it would have never been worth trying.

[Wizard]

Re: CTX 19” CRT Monitor Blurry Display

Hmm kudos to you. That red glue RCA used is really solid and strong bond to CRT and I'm bit afraid of inducing insplosion due to thin section around the bell & neck area.

Yes it is same pin out.

Cheers, Wizard

[mikecebu]

Re: CTX 19” CRT Monitor Blurry Display

bad focus that far out will also have bad convergence.
samsung crt says it all.recycle it its done.
anything,even a chungwha is better than samsung when it comes to crt's.
one last thing you can try is to ground a screwdriver with a cliplead.
pull the socket.
power up the monitor and while live ground the focus pins.they are walled off from the rest.if you get a nasty snap it means you may have cleared the leakage.you will have to readjust the focus.
otherwise its junk.focus network in the fly will look like that too.

hi thanks, can you give me a proper procedure how to do it cause i'm bit confused. Better if some illustration please.. I'm afraid to mess out with 24KV

[mikecebu]

Re: CTX 19” CRT Monitor Blurry Display

bad focus that far out will also have bad convergence.
samsung crt says it all.recycle it its done.
anything,even a chungwha is better than samsung when it comes to crt's.
one last thing you can try is to ground a screwdriver with a cliplead.
pull the socket.
power up the monitor and while live ground the focus pins.they are walled off from the rest.if you get a nasty snap it means you may have cleared the leakage.you will have to readjust the focus.
otherwise its junk.focus network in the fly will look like that too.

hi, can you make some steps how to do it. I attached photo for you to label with.. thanks

[mikecebu]

Re: CTX 19” CRT Monitor Blurry Display

up for this thread..
@kc8adu please help. thanks

[Toasty]

Re: CTX 19” CRT Monitor Blurry Display

PM him. He may not be monitoring this topic.

Please bring the discussion back in here though. Others may benefit from it some day.

[Toasty]

Re: CTX 19” CRT Monitor Blurry Display

@ Wizard & kc8adu: Couldn't this also be the convergence chip(s)? A yoke is a major and typically expensive failure.

@ mikecebu:
What is the model number of this set?
If there were any, what were the symptoms leading up to this problem?
Or, did it just suddenly present with this problem?
Did it fail while you were watching it, or was this a case of it was fine one day and failed the next time you turned it on?

[mikecebu]

Re: CTX 19” CRT Monitor Blurry Display

The Model Name is EX951F.
It just suddenly appear.

[Wizard]

Re: CTX 19” CRT Monitor Blurry Display

There are no convergence ampifier on 1 CRT color stuff. Rings on the neck is only for overall static convergence to get three electron beams lined up.

Like I said yoke does affect the convergence also. When a yoke fail in a way, convergence goes out the window. But most of time when a yoke goes bad, either vertical IC either smokes or fail with time or the horizontal transistor fail instantly. But convergence going out of adjustment via yoke does happen. I have seen this many times.

Sudden failure of this you have, just dispose of it. Not worth the time.

Cheers, Wizard