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Your Convergence ICs are likely failing or it is a bad solder joint related to that area. It is very common on rear projections. The solution is to replace the STK chips, check fuses and the resistors next to the STK chips. Replace as necessary and re-align via the service menu. It is about a $300 repair at a tv service center. You will need the service manual if you decide to do this yourself.
Try This: When you notice the symptons Use this simple test to verify. Go to the users menu on the tv. Look for the converge option probably under setup or video setting. Converge is short for convergence to align the red and blue colors to the green color.
If you cannot move the red either horizontal or vertical, then the STK chip has failed for red section. If you cannot move the blue either horizontal or vertical, then the STK chip has failed for the blue section.
If you can move both in each direction then the problem is something else.
Note if one STK chip fails, you replace both regardless. There may only be one STK chip in this set. If there are two, they will be right next to each other.
Sounds like bad convergence IC's; this set uses two STK-392-570 IC CHIPS; both should be replaced and the blue 3.9 ohm resistors in front of them should be checked. Get someone who has done this repair on this kind of set before--it is usually not something for a do it yourself person; the middle pc board needs to be removed to safely replace the chips; then the set needs to be adjusted in the regular and HD modes. If this is helpful, give me a vote. if you need more direct information email me: email@example.com
If F9A04 and F9A05 are open the convergence ICs will need to be replaced as well as the two pico fuses. You will need two STK392-570 Convergence ICs and two 5 amp pico fuses. You ca get the replacement parts at the following link with free installation instructions. heres thelink. http://servicemanuals.vstore.ca/
CEM-NO, BOTH ICS' WORK ALL 3 CRT YOKES.YOU EITHER NEED TO REALIGN THE RED IN FACTORY CONVERGENCE MODE OR YOU HAVE A RESISTOR THAT HAS FAILED.THE LATTER YOU MAY ACTUALLY BE ABLE TO SEE IF YOU LOOK CLOSELY.OH, ALWAYS DOUBLE CK. YOUR SOLDER CONNCETIONS.GOOD LUCK. JOE TV