Sony KV-1810UB MK-II

[nokicky]

In a relative's house I found a Sony KV-1810UB MK-II.

It still works very very well, the only thing I noticed was a cluster of black spots on the bottom right of the screen.

I'd be interested to know a little about it.

Thanks!

[toshiba tony]

An 1810, watch those GCS's, you are lucky. Looking into your issue, know them well(ish)

[dazzlevision]

I think this was the first Sony TV to be assembled in Sony’s new plant in Bridgend, South Wales. It used some non-Japanese parts, such as a Mullard varicap tuner and a Goodmans loudspeaker (IIRC).

[simpsons]

What a find. I have one of these as well and now I know the stand it once had!

To your question. The black spots are caused by what must be moisture ingress between the bonded CRT faceplate and implosion guard from which mould then grows.

I have it to a slight degree on a another KV1810 display and some while ago a Sony 32HD Broadcast Monitor was for sale on Ebay which had the same problem. The seller in this instance suggesting that the implosion guard could be removed. Oh yes!

This is not to say that the home the set was used in suffered from high humidity but possibly a manufacturing defect. Who knows

From the screen shot it isn't possible to see how bad your contamination is so I hope that at least it doesn't get worse.

There are some issues regarding the reliability of the set which can be simply made good subject to your skills. It requires some preventative maintenance, replacing some electrolytic capacitors and most importantly, keeping the on/off switch mechanism in good working order. As your set is working, once done it should, in the usual SONY tradition, give years of service.

Should you feel confident in changing some of the known troublesome components, I can forward details and links to our own Sony experts threads on this site.

Chris

[Maarten]

I'm surprised at the presence of glued on implosion guards in Sony sets, especially in case of the 32" HD one (I've never seen a KV1810UB MKII so can't comment about that one).

[simpsons]

Maarten

I stand to be corrected.

It is a tricky one here as the black spots are certainly behind the faceplate of the CRT and whilst later monitor tubes had Anti Reflective coating on the faceplate, I am sure that the 18" KV1810 isn't one of them.

I have seen the black spots and they are not "get at able" so, unless they are inside the bulb of the CRT, I cannot find another explaination.

Chris

[jhalphen]

Hi to all,

@NoKicky : same topic (Trinitron spots) on US forum VideoKarma in 2012, see here :

http://www.videokarma.org/showthread...pots+Trinitron

Photos included for non-VK users.

Does yours look like this ?

Best Regards
jhalphen

[Kyle__B]

Exactly how glued on are we talking? Bit of warm water and a stanley knife, or?

[simpsons]

Well, well, thank you JHalphen; those are exactly the black pots I've seen on the CRT and also the answer. Hmm. An acrylic sheet bonded to the CRT faceplate to act as an Anti Reflective filter but not as an implosion guard.

I'm not too sure if I'll try to see if the faceplate scratches though!!

Chris

[Refugee]

If it is just a bit of sticky backed plastic it will be a lot brighter after "peeling" it.
I did a VGA screen with a Sony tube due to a scratch. It also generated a lot of static so be aware of that if switching on or off.

[simpsons]

OK I've been able to look again at the faceplate of the KV1810 Trinitron CRT and it is glass, not acrylic. This doesn't mean that monitor Trinitrons haven't used a plastic AR at sometime in such designs, but not this one.

So, back to the drawing board. N'est-ce pas?

Chris

[simpsons]

Patience is a virtue and at long last I have replaced my spotty 18" 114 degree Trinitron CRT with one from a donor set. The image performance is now as good as new measuring just under 150cd/m2 at full "Picture" on illumiance C white, the old tube just managed 100cd/m2.

Having removed the old one I thought that I'd see if the faceplate was bonded or not. The giveaway was the use of clear adhesive tape along the edge of the CRT overlapping the faceplate

Optically clear silicon has been applied over the face of the CRT and this secures what I can confirm is clear glass.

It is possible to dig out the silicon but the silicon then becomes opaque which is worse than the black spots.

It may be possible to remove the faceplate. Given the tube feature a rim guard I'm not sure its purpose except to maybe mask the phosphor strips.

Chris

[HamishBoxer]

Do not thinking of removing that rim guard as high risk of implosion.

[simpsons]

Thanks Hamish for that very important advice.

From my perspective. I have no further interest in removing the glass faceplate. Indeed, similar to self adhesive mirrors. the bonding between the substrate and faceplat will make it almost impossible to separate them.

Chris