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CTV Toshiba T24 - Bush/Rank TV

 
Jamie
(@jskinner97)
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Hi, After 12 years continous use my daily tv has started to produce a bit of an unusual fault...

I have red bleed, which I know is common and usually means a tired gun/tube, But red bleed on yellow seems unusual!

Every so often, It also loses colour producing an entirely B&W picture briefly, then returns, it can go days without doing this, or do it twice in a few hours! 

Any ideas? Been a sterling TV, and all colours and brightness are nice and strong so i'm doubtful the tube is tired, Im thinking it could even be as simple as a dirty pot? Could it also be the Youview box perhaps? Outputs as SCART into VCR acting as an RF Modulator. Playing a video in the VCR doesn't produce the same fault

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The photo makes it look like chaos, but it really isn't as bad as it shows, the only visual issue is the yellow/red bleed as you'll all know its near impossible to photograph a CRT! 

It's a Bush TV, Made by Rank, Incorporating a slightly modified Toshiba T24 Chassis (and tube) 

image 2022 03 09 110223
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Topic starter Posted : 09/03/2022 12:06 pm
Cathovisor
(@cathovisor)
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Posted by: @jskinner97

I have red bleed, which I know is common and usually means a tired gun/tube, But red bleed on yellow seems unusual!

Not really - yellow is red plus green and that looks to be a fully saturated yellow too. It does look like you have the inverse of it at the start of the box, because that looks a bit green (as in missing the red)?

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Posted : 09/03/2022 12:28 pm
Jamie
(@jskinner97)
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@cathovisor Maybe I need to go back to first school art in mixing colours haha.... So is my convergence out slightly? 

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Topic starter Posted : 09/03/2022 12:36 pm
Cathovisor
(@cathovisor)
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I wouldn't have said so Jamie, because the edges are so ragged.

I wonder if it's still possible to get the Freeview test card up? That'd be a bit more helpful - of course, you could just try turning the contrast down first to see if that reduces the problem?

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Posted : 09/03/2022 12:45 pm
Jamie
(@jskinner97)
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@cathovisor Sadly the test card was removed when BBC watered down their interactive services last year. I'll have a hunt around and see whats what 

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Topic starter Posted : 09/03/2022 12:50 pm
Jamie
(@jskinner97)
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SpongeBob is nice and sharp with no problems… so it does seem localised… maybe it’s just because these “buttons” are so small? Who knows. It struggles all of these GUI’s designed for massive HD TVs 

 

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Topic starter Posted : 09/03/2022 12:58 pm
Cathovisor
(@cathovisor)
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I wonder if the PAL signal being fed from the STB to your VCR is out of spec then? Spongebob is a particularly vibrant shade of yellow after all! (I'm assuming Spongebob is off-tape here) 

Appreciate what you say about GUIs - they are seldom, if ever, created with CRT users in mind. 

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Posted : 09/03/2022 2:32 pm
Jamie
(@jskinner97)
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@cathovisor that did cross my mind, ironically no this SpongeBob is “Live” off the receiver itself.

 

So maybe it is just down to the GUI?

This is the only youview box left with SCART, all others are HDMI, which I can easily downscale to Scart then to RF but picked this one so I don’t have as big a rats nest. 

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Topic starter Posted : 09/03/2022 2:39 pm
malcscott
(@malcscott)
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Try increasing A1 volts.

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Posted : 09/03/2022 3:26 pm
Cathovisor
(@cathovisor)
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@malcscott Good call - many a seemingly dud CRT at work was brought back with that (Melford DU5, I'm looking at you).

Funny how we forget those sort of things in a world of OLEDs, dual LCDs and the like.

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Posted : 09/03/2022 4:39 pm