Sony Trinitron KV-32LS35V CRT Dying ?

On Sun, 15 Oct 2006 12:21:28 +0100, Derek ^ Has Frothed:

Leave it on 24/7 and hope it fails.

they will most likely tell you to take it to a shop and the shop will or should give an estimate to the xredit company and they WILL rfusee to repair it and let you get a new set. at least thats the way mu shop does it

This is indeed falling CRT emission. I'd aim firmly for a replacement set, as although it could be fixed it would not last, and a CRT is not in any way economical to replace. Emission must have fallen quite badly to get to this point, and it will only deteriorate if not replaced.

NT

Your description sounds like a CRT that has been failing for a while. Most of these CRT's are no longer available. If so, the cost would not be feasible. In these cases, most of the warranty contractors will give what is called a pro-rated rebate for an exchange.

Read your warranty contract very carefully to know the agreement that is stated on it. This way, you will be in a legal position to argue for a full credit, if the contract indicates full exchange, which I doubt after the first year.

--

JANA _____

When switched on from cold the picture is very dark, the highlights appear to be crushed and "silvery", the colour balance is wrong with low level flesh tones (under the chin, say) taking on a magenta cast.

This effect warms out quite rapidly within 5 or so minutes, and if the contrast is not run too high the picture is more/less normal for the rest of the day but highlights can still look a bit silvery and coloured yellowish. The problem appears to be getting worse.

The set was bought with a "free" 5 year extended warranty *but* the retailer, Allders, no longer exists. In the UK I can make a claim against the finance company who provided the credit to buy the set, thankfully they still exist. But there is only one year left on the Ex. Warranty and I might have quite a lot of argueing to do with them.

I am thinking the CRT has one or more low emission guns and the repair will be expensive/uneconomical. I don't want them to start a long backwards and forwards sequence of repair visits 'till the warranty expires.

Forewarned is forearmed. ;-)

TIA for any opinions.

DG

This is a classic picture tube failure, I've seen it as many as 50 years ago on B+W sets. The silver shimmering is exactly the way to describe it. There is no way to do anything except replace the picture tube or buy another set.

H. R. Hofmann

Derek ^ wrote:

I guess the silvery effect is due to the effect of the electron cloud, which makes continuous electron output well below peak output. White edges are represented ok, but once that e- cloud is depleted the gun can only supply a rather lower output, thus highlight areas become grey while white edges are white.

There are 3 simple means of repairing this. The issue is how long it would last on a tube thats reached this bad a condition in just 4 years, ie is going down quite fast.

NT

I would certainly refuse a repair! I agree that your CRT is as good as dead but if there is only a short time to go before the warranty expires some repair shops may decide to rejuvinate the tube instead of replacing it. The result will be a very good picture - for a short time. Check your warranty agreement and if possible insist on a new tube verified in writing, or a replacement set. Be aware though, that some policies guarantee the tube for 12 months only but the rest of the set can be longer. Watch out for this. Regards, Colin

Derek ^ wrote:

I just presumed the end user would have no legal right to such, and would thus be taking a chance as to what the supplier decided to do.

If all they offered was a tube rejuv, I'd say no, having nothing is better than doing that. The problem with rejuvenators is they make the tube smear badly when it saturates, meaning that as the emission goes down again, which it soon will, instead of just getting wonky or so-so colour, you get real bad picture smearing, and your set gets an early death as no-one would want to watch it like that.

If OTOH you get nothing done, voltage boosting can keep old tubes going for years. I did some very aggressive boosting on a Sony set in much worse shape than yours, and it was still ok years down the line. I got it so bad that nothing could be seen on the screen at all, and I boosted it so hard I didnt dare give it to anyone else. IIRC +70% heater, +10% EHT. Whoever had it before must have had very good night vision :)

NT