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Well, the truth is that CRT - Tubes wear out. These tubes are only 5" diagnally and they have a great amount of voltage that ignights the tubes phosphore on the face of the tube. Think of carpet that gets walked on in the same place every time. Same idea - the area that get's walked on wears down. No way to restore the carpet execpt to replace the whole carpet. Just like the CRT tubes. If you wish to have better color. Replace the 3 CRTs 'Red, Green and Blue'. Honestly it would be cheaper to purchase a new TV. Might be time to upgrade to a flat panel. Plasma's have much better color than LCD. You may look into a rear screen DLP Projector TV. Good color also but a lamp to think of replacing at some time. Blessings, A/V Media Guy
Hello: Seems like you have a picture tube problem. The yellow color is from a weak green crt. I suggest replacing the Red and Green Crt's in this model. They are nortoriuos for Failure especially the Red. The cost for these tube vary from 110.00ea to 150.00each. I don't know if you want to spend that type of money on this set, as i Know this peticular set has an expectional picture quailty, my experience with replacing sony picture tubes, is to replace all three tubes, as the new ones will show brighter. So replacing the red and green crt's and not the blue is not recommened. But thats up to you, you might not notice the color difference yourself. You also have the option of sending the Crt's for refurbished ones or having the originals rebuilt by a company in Calif, called VDC, Video display Corp. They sell and refurbish sony CRTs. This route is much cheaper, the only problem is having the crt's taken out and sent for repair. The other option is to think about purchasing a new set. As this repair price could reach into hundreds of dollars, Around $600 to $700 for parts and Labor..
This may not be a picture tube problem, but considering the age of the unit it may be cold solder joints on or near the crt boards. Each tube has a CRT Board attached to the neck of each picture tube. Check these first for bad solder connections, in not then it may be the green tube has finally failed you. Getting tubes for this old of a unit will be very hard. IF it is the Tubes then i recommend you think about purchasing a newer set..
Is this a CRT (picture tube) or LCD, DLP projetion set. DLP and LCD are lamp driven CRT have three picture tubes (red green and blue). You can tell by looking at the back pof the set if you see the glow of white light than it's a LCD or DLP. Lamps can be purchased at "bluestar international" ($100-$400) (google it) and CRT's are not worth replacing (over $300 each_)
Thats a very strong possibilty the phosphorus may be burned off the CRT face. Does the blue project when powerd up and looking in from the raer of the set? Look into the blue CRT lens while its playing If you can see a clear picture I would think that you have some open resistors in the blue circuit, If you cant see a picture its time for a CRT. If you need a CRT let me Know I have a good source for them Used.
You have a bad blue picture tube. If you replace it the red and green will be weak and probably go sooner than you think. Everytime I had to replace a tube in a sony projo tv i had to replace all 3 picture tubes at the same time. It's very expensive if you don't have any type of warranty coverage.
Certainly you can do it yourself if you are careful and go about discharging the CRT. I would suggest getting the service manual that explains in detail how to change picture tubes and set the new one up. A new tube will cost between 2 and 300 depending on where you buy it. I am enclosing a link on where you can purchase the service manual for your set for 10.99 and you get unlimited support with the manual purchase for free. They will mail it to you, unless you go back to the site after purchase and click on the contact link asking for them to email it to you, And they will also email you instructions on how to obtain your free support via online chat. Here is the link. http://servicemanuals.vstore.ca/