neck board seperated from tube...(AGAIN)

[draginit]

before i search out a repair shop i was hoping if someone could tell me if i'd be wasting my time. ive had this monitor(HAPP vision pro 27") for over a year now but its unfortunatly got less than 50 hours on it..literally.  i was just playing a game and i heard a hissing sound as the screen went black and then almost like a little implosion sound(which im guessing now was the glass breaking) and then discovered this!  what are my chances of repair? and what couldve caused something like this so it doesnt happen to any of my other machines?
-thanks for any info.

[HaRuMaN]

Yeah that's done for.   You can't fix that.  Time to get a new monitor.

[Ken Layton]

What the hell did you do? Hit the tube with a sledgehammer? It's destroyed. Looks like a probable cause could be physical abuse/dropping/banging during shipment or installation. Another cause could be temperature extremes (sudden cold/hot causing thermal stress to the glass). Or it could be a legitimate case of a defective tube (bad glass during manufacture).

You could have a new tube installed & reconverged. That would fix it, but you'd have to decide if the cost is worth it to you.

Otherwise, you're going to be buying a new monitor.

[draginit]

i know! thats just it tho, this machine hasnt moved since i installed it so i think abuse and dropping scenario are out. im starting to think it was damaged during shipping now that you mention it cuz ive had problems from the beginning with this monitor. its already been to HAPP once for repair and that warranty is long expired.
-i guess i'll start pricing new tubes and monitors,. i feared that was the answer...what a bummer tho this was an expensive monitor!!!
-thanks for the info

[Rickn]

So ok, if you did not touch it, here is what may have happened.

This is a defect in the matching of the tube to the neck, what happens is the positioning of the yoke (front to back) to get reasonable purity is too far back on the neck.

What happens is the electron beam hits the neck internally before it hit the phosphor. This causes the tube to heat up at that area of the neck - creating what is called "Crazing" after a period of time the neck breaks because of heat.

Happ will not understand this, and neither will most monitor manufacturers. A tube manufacturer would.

It can be verified by examining the broken area of the neck with a 5~10 X magnfying glass,

There will be "Rainbow" lines as you look at the broken edge if the curve outwords, the stress to the glass came from the inside. If opposite it was from outside.

Another hint will be to look at the inside surface of the broken neck, if you see a series of what looks like multiple small scratches- then yes it is crazing.

If this is right, look out Happ, there will me more possibly many many more.

Anyway, sorry, but yep your screwed.

Good luck

Rick Nieman
Rick@niemandisplays.com

[draginit]

well, i just lost my 2nd monitor to the same problem and venting my frustrations here. i went to turn on the machine and almost immediatly the damn neck just started making a sizzle noise, and then a loud popping glass break sound, and then what sounded like air gettting sucked thru a small hole quicker than it would allow for about 10 seconds......then all was quiet and dead.  upon inspection, sure enough, the damn neck seperated from the tube. i had it on for about 4 hours the day before with no issues. what is also unfortunate is i bought 3 monitors all at the same time and now im just expecting the 3rd to go any day now. damn you HAPP!!
- on a lighter note, atleast this monitor got plenty of use before it fried...
-and i guess i have parts for 2 of these monitors now if any one out there needs them!

-Rickn, i tried looking for what you described it may be, but to the untrained i, im not sure what im seeing. also i dont know if my mag glass is strong enough. do you have any photo reference i can use?

[grantspain]

this must be a production problem,happ need to deal with this as is could be deemed dangerous under health and safety.
there is no way a tube will do this unless it has a fault in production or there is intolerable pressure at the point of breakage.
i guess there is nothing near the neck or neck base that could cause this?

[qrz]

have heard of a yoke defect causing this too, but rare ! 
am also curious as to the tube mfgr and of course the tube number .
meanwhile, i'd just toss a junk pile crt  ( i.e. free-its amazing what people toss out ) in it and see what happens...

qrz