Question about Akai PT4298HD Rear Projection Television

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Picture quality the tv has no blue in it. all the purples are red. i looked in the back and it looks like the blue crt is not working. could the tube be bad? or is it in need of adjustment?

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Possible blue crt is defective. also the tube needs filament,blue drive and screen voltages/high voltage to lite up. these should be ck'd only by experienced tech or OUCH! john

Posted on Sep 12, 2007


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Remove purple haze around edges

The set needs to be focussed and reconverged. The red and blue images combined make a magenta/purple image. Adding green makes it white. Depending on the type of TV, if it's a CRT projection TV then there's an electronic focus control for each of the three tubes as well as the mechanical adjustment of the optical lenses. Given the description, then I'd have a look at the electronic focus first. A sudden shift in focus suggests that something in that circuit has given out. This would cause the red and blue images to go soft enough to create a halo around objects on screen.

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if you are seeing just green and purple color then your red crt is not working could be just a loose connection on the red crt socket or a bad red crt . crt meaning red picture tube.

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Model ds31590 screen has a reddish purple tint whether it s on tv or video i have already tried to change all picture settings and set back to factory settings still has same problem,here is an example...

Chances are real good that your picture is showing its age. There are three color beams in the neck of the picture tube. When these electrodes are operating correctly the will produce an arc, that will produce the proper voltage for color correction. Much like the spark plugs in your car. When you have a fouled spark plug, you replace it. In the case of a TV, replacing the tube is the best way to correct the picture you are looking for. It would be to costly to do this of course. Another option is to rejuvenate the picture tube. Once again, rejuvenating the picture is last resort. Customers must be warned that rejuvenating may work or even in some cases destroy the picture tube. I want to remind you as well, the symptoms you describe will over work the main board as well. This TV is not feasible for repair. Thanks for asking and show a few hands of support!

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Turns on for 30 sec then goes bright blue and goes back into standby. turn back on it does it agian

This is blue CRT problem in tv as it is rear projection tv that has three CRTs red-green-blue inside to project color picture on front screen.
Blue CRT (tube) will be replaced to fix the issue and it is job of Pro because lots of adjustments are required after replacement of tube.
Local tv repair shop will help you for that.

Oct 02, 2010 | Sony KP-51WS500 51" Rear Projection...

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I have sound but the picture is purple and will not adjust with the remote or manually with the buttons on the tv what can I do to fix this on the philips 36pt41b129

The unit has lost its green video information. This can be a picture tube or a green drive problem. The only colors you are getting are red and blue thus the purple picture. All picture tubes have red, green and blue guns to make all the colors needed for a normal picture. It will take some troubleshooting to determine whether it is a drive problem or the picture tube itself. Have a repair shop check it out for you. A 36" TV is worth a check out fee. Thanks for using Fixya. Let me know how it goes.

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Hi, i have a somewhat fuzzy picture and purple

Ur convergence is dead,U know how to solders?Buy a convergence kit,replaced what in that kit.Here a website.Tv repair,for the kit.

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1 Answer

I have a Symphonic 32" Color TV the picture is red. I need a tv repairman person to come out and look at the TV.

the dives or guns are out of balance. either the blue and green circuits are weak or the red drive is maxed out. when picture tubes are getting old, this normally occurs.
another thought is that the tint is incorrect and saturated. what is the picture quality details?

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Convergence bowed


the coming out is glycol oil (coolant). If still under warranty or if you have no electronic repair experience you should take the set back to the shop or to a repair person. Some of the solutions described below can be dangerous, TV's are very hazardous to service. Even when plugged out, TV's can store very high voltages.

Looks like a picture tube problem.
Try to reduce the contrast, maybe it will be better.

Look into the three tubes while the TV is running, and observe the
picture quality of the three. If the red and green are crisper and clearer, and the blue's all hazy from bacteria growing in the coolant, then the fluid needs to be replaced. The CRTs of the colors that seem hazy need to be removed from the light box to be
serviced. The coolant needs to be drained, the CRT assemblies
disassembled and totally scrubbed clean and refilled, then reinstalled and converged. If the coolant is
clear, it can be a weak CRT.

Also the convergence STK ships might need to be replaced, and the soldering checked.

Good luck

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Your blue crt has a short - you can verify this by unplugging the socket from the blue crt and powering up the set and you should see a yellowish looking picture with just the red and green crt's operating. You can try turning down the screen control pot (B) for blue with the blue crt on (just to the point where you no longer see retrace lines in the picture on a blank input)Sony has had a lot of problems with the crt's on these models and sooner or later all the crt's will fail - For a permanent repair all must be changed.

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1 Answer

Jvc tv picture quality

sounds like your crt tubes...meaning Red, Green and Blue are out of alignment...or possibly 1 of the crt's is burned out.

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