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I have a dark blue and light green colours on the upper left side of my picture tube. I want to know if there is a problem with my picture tube. Also, if there is a problem with my picture tube how do I fix it. Thanks your for help

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Color Picture Tube get effected with Magnetic waves, please check and remove any thing having magnet inside like speaker etc near your tv.

Posted on Aug 24, 2008

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Toshiba tv has dark picture cant hardly see want get bright


If it's a old style projection screen pry off front grid, you,ll see a trapezoidal mirror this often becomes hazed smoke, dirt, ect. Make sure set is unplugged DO NOT ASSUME THEIR IS NO SHOCK HAZZARD BECAUSE SET IS UNPLUGGED(see capacitors) be careful and clean mirror with damp cloth and glass cleaner try not to spray as safety percotion, their are 3 tubes red , green, blue, green is th dominaent color if you know how turn blue HVU UP 1st( CLEAN picture tube lens 1st) These type of picture tube have clear poly glycol ( anti freeze) in lens unit to cool and is part of the optical system. I this fluid becomes contaminated then cost of repair may exceed value of unit, then increase red value I just thought you may bee able to do the color via menu not sure, if picture has a green tent at start this should help good luck , lot me know what you see.

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Yes, the cooling fluid in the blue and green picture tube assemblies has become contaminated. Thats why the red is predominating. The contaminated growth cannot grow in red light and that is why the red is not affected. The only solution is to have the blue and green tubes pulled and disassembled and cleaned and new fluid installed. This is not a simple job. Most reputable shops charge around $300 to $500 for this repair.

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Normal color picture is composed with 3 colors R-G-B (Red-Green-Blue). Picture turns Red means: Missing Green and Blue colors (many reasons: bad contacts, projector tubes dead, and other...). Try to give some "tabs" to diagnose ... I don't know what is the type of your Projection TV, how long you owned it, to have more idea.

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Blue transperant colour spread over the screen from the left.


IN THE MENU CHECK FOR A COLOR CONVERSION OPTION ,,USE IT ,,TO REALIGN THE COLORS

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Is the tubes going out on my rear projection tv?


If the red, green, and blue colors are separated like a rainbow, then the convergence amps are going out. This set has a common problem of two electrolytic caps going bad. The caps are in the upper left-hand corner of the main board and will have a bulged top if bad.
I would not think the picture tubes are bad, especially all at once.
- Dan

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The colour is off and the conversion


You have a problem with the blue and green tubes having a fungus growing across the face of the tube, thus blocking the light/picture. This will cause the color to be way off and the focus as well. Need to have the fluid changed in blue and green tubes. The red never seems to be affected...must be the red wave lenght inhibits the growth of algee or something. Anyway....That's what you need, not the convergance chip STK's. Trust me on this. T.V. tech. for over 20 years...see this ALL the time. Good luck.

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1 Answer

Hardly any Blue Color in the picture. the blue tube is projecting darker and dimmer.


You need a Blue picture tube CRT you can get one for your JVC at the following link for a real decent price and they provide free shipping. Heres the link.
http://servicemanuals.vstore.ca/

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Sony KP-57WS500 57 in. Rear Projection Television


Hi Guys

Your problem here has to do with the amount of aging that happens to the three colour tubes - red, green and blue.

Blue actually ages slower than red and green. What actually happens is the green tube deteriorates and due to green being the predominant colour for brightness causes the blue tube`s flyback lines to appear - especially when switching between inputs or when the video is blanked.

No replacing the blue tube will not solve your problem as the tube is actually the best one of the three.

As someone mentioned there is a way to adjust this by removing the speaker grill assembly in front of the set. Doing the service mode adjustment with the remote is not the right way to solve the problem - you would be adjusting the colour gain and off-set values and would seriously be compromising the white balance of the set.

On the left hand side behind the speaker cover you will see a black square block with six adjustment points. Look for the one marked SCR BLUE, Switch the set to a unused input so the blue lines become visible. Now adjust the BLUE point counter clockwise until the lines disappear. A small adjustment should do it, Switch back to a picture and make sure the whites are still white.

This should sort your problem. I would however suggest asking a Sony service centre to do this for you. This is a dangerous thing to do as you will be working close to the 35Kv supply the the anodes of the three tubes.

I hope this answers your question.

Goo luck.

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Sounds like you have two differant problems. A red drive or red picture tube is bad and the conbvergence IC's are bad. To test the red drive disconnect the green picture tube socket BUT MAKE SURE THE SET IS UNPLUGGED!!Then remove the red socket and move over to the green tube. Then turn on the set. If you get the same out of the green then you have a drive problem that needs to be trouble shot for a bad componet. If you do get a picture with the red connected to the green then the red tube is shot. If you know how to read a schematic, get one and then you should have no problem troubleshooting the red drive and the convergence problem. If you dont then there is no easy or quick fix as this is a solid state set and there are no user replaceable parts inside this.,. Your going to need, for safetys sake, call in a trained tech to assist you with this repair

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