sony triniton 28" tv fell off

No Sony TV I have ever seen has used anything but pure green for the channel numbers. Andy Cuffe

snipped-for-privacy@psu.edu

filament has to be on u have OSD!! u have prolly a cold solder / cracked board somewhere

If you got anything at all on the screen then the filaments are glowing, they just may be obstructed by other structures in the neck and difficult to see. You'll have to repair broken circuit board before you'll know anything else, the tube is clearly still working, no way to know if the purity will be ok until you can at least get a picture.

About 15 years ago, I thought an imploding picture tube would be cool, so some friends and I found an old TV in the dump, and while hiding down behind a mound of dirt 15 or 20 feet away, we threw a heavy metal fence post at it.

Repeatedly.

Then we walked up to the TV and rammed it with the post or swung at it over and over again.

Eventually, we got a few cracks in the screen. Nothing dramatic except that we were all out of breath from taking turns swinging the fence post. I couldn't believe how tough the glass was.

No idea about the strength of the back side of the tube, though.

That can be the problem though. It doesn't break straight away, but has hidden stress fractures which could fail unexpectedly days, months or even years later. Having said that, it is rare for the front glass to fail on a CRT.

I had a similar experience with glass in a scrap car. At our local scrapyard the guys were trying to get into a Nissan Laurel they couldn't find the keys for. Trying to look cool, one of them swung a spanner at the side window, nothing. He picked up a half-brick sized rock, threw it at the glass, nothing. He picked up an exhaust manifold and threw it at the glass, nothing. He eventually cracked it with a hammer. Glass is strange stuff.

Not as strong, but I've never seen that go either. I've done a few tubes where the whole neck, guns and all, has flown into the tube, but nothing more spectacular.

Dave

My friend and I tried a rock. A big one, about a 20 pounder. It probably didn't help that it was so hard to throw, but that and our lousy aim from "safe distance" outside the "blast radius" made for an exhausting ordeal.

I remember that we knocked the phosphor off the inside surface of the tube with one blow in a very interesting star-shaped pattern. I wonder if anyone's modeled a CRT with Bessel functions before.

We eventually did smash the front in, and it was quite a celebration that ensued, but we never tried it again because bashing a TV in is just too much work.

Had a similar experience with an old Sony. We were cleaning the shop and dumping old junk. We had several televisons. We thought it might be fun to take out our frustrations with a sledge hammer. A Hitachi required a tap. Same for the JVC. When we got to the Sony, we all exhausted ourselves. Finally a burly manager type came out and gave his all. It cracked. Then the rest of us were able to do some damage.

Because the Sony tubes have always been flat (at least in one direction) they have very thick glass for the screens. By the way, the backsides are every but a fragile as any other tube (experience speaking....oops).

PoD

" snipped-for-privacy@sneakemail.com" bravely wrote to "All" (06 Oct 05 20:53:31) --- on the heady topic of "Re: sony triniton 28" tv fell off"

z7> From: snipped-for-privacy@sneakemail.com z7> Xref: core-easynews sci.electronics.repair:344334

z7> About 15 years ago, I thought an imploding picture tube would be cool, z7> so some friends and I found an old TV in the dump, and while hiding z7> down behind a mound of dirt 15 or 20 feet away, we threw a heavy metal z7> fence post at it.

z7> Repeatedly.

z7> Then we walked up to the TV and rammed it with the post or swung at it z7> over and over again.

z7> Eventually, we got a few cracks in the screen. Nothing dramatic except z7> that we were all out of breath from taking turns swinging the fence z7> post. I couldn't believe how tough the glass was.

z7> No idea about the strength of the back side of the tube, though.

If you take the plastic socket off the end of the crt pins you will find there the a glass nipple that was used for pumping out the air. Take a triangle file and score a line on one side. Then tap it sharply with the file. The CRT will whistle "Dixie" for you.

A*s*i*m*o*v

... Back when I was a boy, we sucked the air out of our own vacuum tubes!

It certainly wasn't as difficult 30+ years ago...my friends and I found an old CRT in the woods, and one shot on the front glass with about a 5 or 6 pound rock and it was a goner.

Tom