Sony 30-inch 16:9 CRT Took a Drop - Now have Blotches

Assuming the yoke did not move, which it probably didn't: The aperature grill is damaged.

You might be able to use crt magnets to get a watchable but not very good convergence or geometry in the corners picture.

Warranty would not apply in any case as it was not a manufactures defect but physical abuse damage.

The yoke may have moved, but the degaussing coil did not come unplugged. You most likely have damaged the aperture grill hangers.

Leonard

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Sorry to tell you... It's toast! You will have to live with it. The aperture grill (which is inside the CRT) has shifted or bent. There is no way to perfectly repair this. As another person mentioned, small magnets taped to some spots on the back of the CRT might help, but the CRT is irreperably damaged.

So how's your friend's foot after it "cushioned" the set?

Ugh. Picture on that TV was really great the first 1.5 years of its life.

Maybe I will round up some really strong (from old hard drives?) magnets and borrow wife's hot glue gun.

His foot is black and blue, but not broken.

Thanks guys.

Gary

Leave it be for 2 or 3 weeks (use it normally) and see if it fixes itself.

If it ain't REALLY broke . . . . fixing it may make it worse.

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Dislodged shadow mask, probably the tube has been permanently damaged. If so, you might try to (gently) hit the tube, in the hope that the mask might pop back into place. (small chanche.)

"K4GPB" wrote in news:1172198127.821468.299970 @q2g2000cwa.googlegroups.com:

Your homeowners insurance may cover the damages (to his foot AND the TV).

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bz    	73 de N5BZ k

please pardon my infinite ignorance, the set-of-things-I-do-not-know is an 
infinite set.

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Er I beg to differ: I have seen this before there is only one fix. In my 15 years with Sears service I have fixed many a Sony TV.

With the biggest rubber mallet I could could find, I smacked the screen and only the screen. The aperture in Sony CRT's is made of fine wires like a harp. I got the CRT that I had back in shape. The wire used as an aperture does have memory. If you are lucky like I was the aperture will remember where it was before it was dropped. Sony CRT's have like 4 inch thick screens, shine a laser pointer on the screen if you don't believe it. The pointer will reflect off the phospher 4 inches below the surface. So if you think implosion is possible don't do it. I guess I've been lucky and never seen a CRT implode.

73

N8ZU

When Sony Engineer told us in a training class that you DONT ever ever try to degause a Sony CRT, I asked him why?

It seems the aperture being made of very fine wires is pre magnetized at the factory.

Any attempt to degause the screen could demagnetized the aperture wire.

73

N8ZU

Very interesting mallet idea! Many thanks again.

The tricks with the spinning magnets on a drill bit are mentioned over here:

but they don't apply to this great fine-pitch CRT, probably one of Sony's best ever CRTs. It's a lengthy thread but with a few chuckles.

Gary

"Don't ever" is not what I have been told by Sony. This would not make sense anyway. Sony sets typically have the most powerful degausing coils of CRT sets. What we were told is to only manually demagnetize the CRTs when you have to, and preferably use a smaller coil. After hearing this myth repeatedly I have questioned several Sony tech reps over the years on the matter ad they say the same thing. They tend to emphasize caution because there are so many idiots out there who don't pay attention and understand the nature of what they are doing. I have degaussed many that would not clear up with the sets coils working properly. There is often no other way to do it but manually. The rule is do just enough to clear the magnetic effects to get purity.

This "don't ever" nonsense is as foolish as saying to never use any supplier other than Sony for parts. A grain of truth taken to an extreme by not understanding fully what is going on.

Leonard

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No, if you do that it will most certainly be damaged beyond repair. You want weak magnets, like the sort of rubbery refrigerator magnets that come in the mail with advertisements on them. Likely it will never be perfect again though.

4 inch? Try more like 1 inch. I dissected a 27" Sony tube a few years ago that had been dropped, it was already cracked and up to air when I found it.

Well, tomorrow I'll take a look at the glass thickness with the light from my laser level gadget and then try the mallet on the Sony KD-30XS955 CRT face and see what happens. The TV is across town and has been in the back of a minivan all week since the "drop test" and darn, nobody stole it! ;-)

--Gary

Laser beam showed phosphors about 1 inch behind front of CRT. Did about 10 min of beating with 16 oz. mallet. No change in symptom except a lot of vertical shimmering while the beatings took place. It's toast. Next, I may remove cover and look for any purity(?) magnets that may have been dislodged, just in case they used any in the factory.

--Gary

You might have some luck adjusting the yoke, it's unlikely but you never know.

Turn the set upside down, and drop it again from the same height as the first drop.

Well, after a month of sitting in the back of a daily-driven mini-van, it still has the same lousy picture:

It has suffered many beatings with the biggest mallet I could buy!

Gary

Try the "magnet trick," discussed here on April 14, "Panasonic with purity problems somehow repaired":