CRT madness!

80s Synth Pop · 24-06-2023 11:56am

Such a fantastic youtube channel on chassis repair:

https://youtube.com/@mikesamateurarcademonitorr6856

Doge · 08-07-2023 6:57pm

..

Jack burton · 10-07-2023 11:45pm

I have a nice Sony 29" Trini that's really in my way. Has some corona discharge. Feel free to give me some recommendations for a new good home for it of anyone wants to.

Jack burton · 22-07-2023 8:50am

Having a bit of trouble with my widescreen Trini. Getting a lot of interference from any of the scart inputs im using.

Its on a stainless steel table. So i put a sheet of ply underneath the tv to see if that helped, it didnt. Theres a large crt beside it so i put a sheet of foil insulation between them to see if that help but it didnt either.

Anyone have any tips for finding out whats causing this? Using a ikea extension lead so could that be it?

Jack burton · 22-07-2023 10:18am

Sorry that picture was meant to be a video

https://youtube.com/shorts/iimQliQnZcM?feature=share

Inviere · 22-07-2023 10:41am

https://www.boards.ie/discussion/comment/120882154#Comment_120882154

I know you tried ply on the table, but is the table actually magnetic? If so, the table could still be the culprit. Hire a small crane for the day and move the Trini elsewhere to rule it out...

o1s1n · 22-07-2023 12:55pm

https://www.boards.ie/discussion/comment/120881922#Comment_120881922

Oh there's a high probability it could be the CRT beside it too. If my cabinets are too close together I get a wavy interference on both monitors.

Possible to try testing it out completely isolated from any other CRTs ?

Jack burton · 22-07-2023 5:09pm

https://www.boards.ie/discussion/comment/120882236#Comment_120882236

Oh i don't know that. The top is stainless but i think the legs and frame are steel so ill try that out over the weekend

https://www.boards.ie/discussion/comment/120882633#Comment_120882633

Last time i plugged it in it had no issues so i guessing the table. I plugged out the crt beside it. But theres still room on the table. Ill slide it down as far away from the other one as I can and see too

Jack burton · 22-07-2023 7:03pm

Top of the table is magnetic. So ill lift it off and see if it still makes a difference. If it does ill have to come up with a solution....or find a massive new table

Been using my grundig crt on a stainless steel table for 6-7 years now and never any issue and thats magnetic too. The grundig tv is chipboard so probably a bit isolated from the metal. The trini is a early 2000's id guess and only plastic frame

KeRbDoG · 22-07-2023 8:13pm

A metal plate between the table/set might help. Strange the table is magnetic?

Jack burton · 22-07-2023 9:41pm

https://www.boards.ie/discussion/comment/120884224#Comment_120884224

Yeah i was just reading up there on stainless steel there. Some of them are non-magnetic but it depends on the type.

Like fridge magnets stick to the table and to my old table aswell. Bit of an odd one

Jack burton · 24-07-2023 9:29am

Had another go of this last night. Moved the crt away from the other one and picture was perfect.

Moved it back a few inches and happened again. So i guess that was the problem.

Picture looks great now. Had the xbox playing a dvd and the gamecube playing and everything was A ok. So its the general rule for crts i think. Once everything is working ok just leave it alone.

On a side note theres 2 good scart inputs and one crap one that gives a dull picture. Youd think on a good Sony set they would have all 3 of them good

o1s1n · 24-07-2023 12:25pm

Delighted you got sorted, was worried you might have to start looking at actual components soon. Those CRT magnetic fields can be crazy strong when putting them side by side.

Is it possible the crap scart input is composite only?

I do love watching DVDs on CRTs, the picture quality really is super crips over RGB.

Jack burton · 24-07-2023 6:50pm

https://www.boards.ie/discussion/comment/120890108#Comment_120890108

Yeah id be pretty sure its just a composite input so picture is very much washed out and dull

Jack burton · 24-07-2023 11:08pm

Bad news.....had a dvd on tonight and maybe after 40-50 mins started getting interference again.

Ill open it up tomorrow anyway and see if theres any caps that look bad or anything and take it from there

Edit

Just reading up there that it could be the rf connector picking up something so I'll try and sheild that or something tomorrow and see aswell

o1s1n · 25-07-2023 12:50pm

I wonder could it be the degaussing coil causing interference? Might be worth disconnecting it if you are opening the back up.

I suppose though if it were any type of magnetic interference, so degaussing coil, other forces like CRTs close by etc you'd probably have colour discoloration too. I can't see any in the video you posted.

It might be worth chucking up a grid pattern on the screen just to see the extent of where the interference reaches across the picture.

Jack burton · 25-07-2023 9:05pm

Need to find my longer screwdriver before i open it up and see whats what.

Going to order new rgb console cables this weekend too. I need them anyway.

But in the mean time I'm going to get the rest of my arcade and room finished renovations and just leave the tv for a couple of weeks. Ill play dvds etc on it and see how it goes. Could just need a few hours of use too..... not likely but ill live in hope for the time being 🤣

Jack burton · 29-07-2023 3:52pm

I was at this again the other night, i cant leave it alone.

Same deal but i turned off the console and had the tv on to aee if it kept it up and i didn't seem to. So now im thinking its probably something to do with the bog standard cables not being insulated enough. Ordering a few new ones Monday anyway

CiDeRmAn · 17-08-2023 12:18pm

Seems like there are options for even terrible old CRTs,

https://hackaday.com/2023/08/16/new-motherboard-improves-old-crt-television/

80s Synth Pop · 26-10-2023 6:34pm

For anyone in Clare there is a rare enough NEC 1970NXp 15k capable LCD monitor for sale cheap:

https://www.adverts.ie/monitors/computer-monitors/31924327

Example of it handing 15k https://www.youtube.com/watch?v=UoLnpnUhlGY

Inviere · 31-10-2023 9:53am

I presume this is fubar yeah?

geotrig · 31-10-2023 12:17pm

I'm guessing yes but its hard to tell ,cant see it well enough to know if the vacuum is gone, the pins normally protrude after the vacuum so may be ok,cant really tell if the parts afterwards are just guides rather than part of the "tube". Its hard try to put this into the right written words this morning !

Inviere · 31-10-2023 12:57pm

https://www.boards.ie/discussion/comment/121304795#Comment_121304795

Hmm, I just seen the broken glass and assumed the vacuum must be gone, but perhaps not? In terms of testing, is it a case of straightening the pins out, attaching the neck board, and going for a hail Mary?

I have two of these stored in the attic back home, but some gimp doing work in the house was up rummaging around in the attic and apparently used the neck of this CRT to store boxes on.

geotrig · 31-10-2023 1:17pm

Yeah basically a hail mary alright ,if you are hooking it up power for like 1/2 second and you could tell, If noting major happens could go for 1-2 seconds then and so on ,you could get a bit arching if it was really open and vacuum gone ! but un-likley hence the brief power up at 1st. I'm sure there is other ways to test if it still as a vacuum but plugging it in is probably the easiest for me anyway ! 😂 A lot of these old cabs have arching monitors !! 🤔

its hard to tell from the pics (for me anyway ), it could be compromised further down from the boxes weight om it. some necks have just gone from changes in temp with no really visable crack.

Different tubes finish off the end slightly differently the seal normally happens before the pins protrude so there is that hope

Steve X2 · 14-03-2024 3:30pm

Very funky 🙂

https://www.youtube.com/shorts/Fkshp4Ikk6Y

Jack burton · 19-03-2024 11:27pm

Got a 90s sony PC trinitron from my local printer the other day. RGB and VGA input on the back.

Dead as disco though. Feels like it could be the power switch. I'll open it up and have a look when i have some more time. Just from looking through the plastic case its inside a metal cage inside the plastic case.

o1s1n · 20-03-2024 12:26pm

Nice one. 20 incher? I had one of them years back that I'd salvaged from my college's PC lab and it was an absolute beast, weighted a tonne. (stopped working about two weeks after I got it home 😥)

DeputyStagg · 10-04-2024 7:48pm

Hey guys,

I have a Sony Trinitron KV-28LS35B which works other than that every while it shuts itself off. See a very similar model going for around 100 quid on advert so don't want to chuck it to recycling, but have no interest in opening it myself. Wondering would anyone be interested in picking it up, no charge would love to see it go to someone who could get use out of it. Based in Waterford if that helps. Cheers

CRT madness!

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