Thread Number: 72793  /  Tag: Other Home Products or Autos
Green screen problem on CRT TV
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Post# 961762   10/10/2017 at 14:37 by LordKenmore (The Laundry Room)        

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I use a 1990s Magnavox CRT TV set. Last night, while watching a DVD, the screen suddenly got a green tinge throughout. Turning it on today reveals the same problem (in other words, it's a problem cold as well as warmed up). I'm assuming the TV is Done For and it's time to for me to crack open a good book, instead, which might help improve my mind. One can always hope my mind can be improved, and admittedly it wouldn't take much...

 

That aside, I'm just kind of curious what might be wrong. Attached is a photo of the TV switched on, receiving no signal (and all signal cables disconnected--I did that last night just in case the problem was with the DVD player). I also notice the screen looks a bit unsteady. The black bar near the top in the photo is not noticeable to the naked eye.

 

 


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Post# 961763 , Reply# 1   10/10/2017 at 14:39 by brucelucenta ()        

time to chuck it

Post# 961767 , Reply# 2   10/10/2017 at 14:57 by Rolls_rapide (Scotland, UK)        

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Regarding black bar in the photo:
Ignore it. It is a product of the differences of scan rate of the tubed telly, and your camera.

Regarding the green tinge:
There might be a faulty integrated circuit chip, or other components (capacitors, resistors) burnt out.
The worst case would be that the electron guns in the tube are worn out.

I've got the opposite scenario myself. My 2004 Panasonic now refuses to show green with any conviction.

Green foliage and grass looks decidedly beige. Those yellow 'Hi-Visibility' vests that Police wear, and the stripes on Ambulances, are decidedly 'off key' in terms of the colour rendition. Human faces look either too red, or are a washed-out pink. Irises of eyes frequently look blazing blue.

I managed to tweak the service menu options and things slightly improved for a short spell. But I have been looking at modern LED tvs.


Post# 961768 , Reply# 3   10/10/2017 at 15:05 by LordKenmore (The Laundry Room)        

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time to chuck it

 

Yes, I figure it's time to replace. I just wonder about what causes problems like this.

 

Regarding black bar in the photo:


Ignore it. It is a product of the differences of scan rate of the tubed telly, and your camera.

 

I'd figured something like that.

I managed to tweak the service menu options and things slightly improved for a short spell. But I have been looking at modern LED tvs.

 

I tried obvious simple fixes to both rule out external problems (e.g., DVD player), or get the TV to limp along. No luck...so I'll probably take the TV down, and keep my eyes open for a suitable CRT set...if I can find any...


Post# 961780 , Reply# 4   10/10/2017 at 15:43 by Rolls_rapide (Scotland, UK)        

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As far as I can gather, it appears that tubed tellys have a finite lifespan. I suspect that manufacturers cottoned on to paring back on the quality of electron emitter material.

I had read an article before, where tube maker Mullard - as fitted to Bush tvs in the past, was aware of 'out gassing' within the sealed cathode ray tube, and perfected the method of heating the tube whilst evacuating the gasses. Thus creating a reliable tube.

I strongly suspect that other manufacturers 'couldn't have given a fig', and just saw or $$$ before their eyes.

A Philips tubed tv we had lost its focus, as did a Panasonic with a Philips tube. A Panasonic with a Panasonic tube (same model) seemed to last a little longer.


Post# 961872 , Reply# 5   10/11/2017 at 01:34 by speedqueen (Harrison Twp, Michigan)        
Don't chuck it yet!!!

I'd suggest you send a YouTube message to youtube.com/radiotvphononut, I would bet that he could tell you the problem from memory. He is very smart regarding those things.

CLICK HERE TO GO TO speedqueen's LINK





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