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If the picture looks alright, and the problem only is with this absence of blue color, the fault should be with its video output card itself. Check all the solder terminals to this card, including the solder terminals of CRT base socket. Re-solder all the suspected loose solder terminals, by applying a little more solder. This card can be located at the back of the neck of the CRT, will directly plugged it. You can pull it out, straight backward to do solder work. To get some details, http://electronicshelponline.blogspot.com/ Pull up older posts.
Try this link too.
Projection TV sets have two very common problems. One is convergence ( 3D/Warped video) the other is CRT fluid ( Dull Video). Here are more details and solutions for both. Repair kits with instructions are also avail from www.TvRepairKits.com
Common Problem #1) Convergence has gone out
Projection TV sets need to have all three colors - RED - BLUE - GREEN - lined up correctly on the screen in order for the video to look normal. When its out of alignment the video will look 3D, wavy, distorted, etc. Most of the time you just need to adjust your convergence in the TV menu. If you cannot adjust it in the menu - then your convergence is broken and needs to be repaired.
This is a very common failure on these projection sets and a fairly simple DIY fix. All projection sets including Samsung, RCA, Sony, Philip Magnavox, Panasonic, Pioneer, Akai, GE, JVC, Toshiba, and others at some point will have the same problem.
Common Symptoms include....
Screen looks 3D
Colors don't line up
One or more colors can't be adjusted when using the convergence menu.
Screen is bowed or warped.
TV shuts off after powering on. Power light will blink. TV may also make a chirping noise.
Projection TV tubes have a liquid coolant that is used to keep them from overheating. After many years the coolant in the blue and green tubes will become cloudy and cause the screen to look dull, red/orange, etc. You may even see halos around images.
Sounds like one of the cables got plugged in wrong.
Look at the back of the HD box and there should be a cable with 5 ends on it (Green,Blue,Red, White and Red).
Often times a flashlight can help make sure you see the colors clearly.
The Green,Blue and one of the Reds is for video. The White and other red are for Audio.
When you unplug the connector the connection it is attached to is also colored. Check to make sure the colors on the cord match the color they are connected to at the box. The most common mistakes connecting these cables are: 1) Crossing the Green and the Blue cables. 2) Connecting the Red Audio cable to the Red Video connection.
If all of the connections match the correct colors find the same cable where it plugs into the back of the TV and check these connections that they are correct.
When you find and move the cable to the correct connection this should clear up your color and you can begin to enjoy your new toys....
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.
Turn the set on without an antenna, so there is only snow on the screen. Measure the 3 cathode voltages at the CRT, red green and blue. If the 3 voltages are about the same, around 175 volts, then the CRT is bad (purple picture means bad green gun). If the red and blue are around 175 and the green is over 200 volts, then there is a chassis problem, usually the video output transistor itself has gone bad or come loose.