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Sounds like the Green CRT drive board is needing replacement. The Green CRT could also be bad but usually the set will shut down if its the CRT, so I would try the Green CRT drive you can get one from www.tvrepairworld.com
I would buy a good used CRT (picture tube) projection 40" or bigger 1st choice Hitachi 2nd Panasonic and 3rd RCA. Get a newer version that has Component video inputs (R,G and B).
Stay away from LCD or DLP Projection - theyare driven by a lamp and are usually expensive to repair.
If you want something newer go with an LCD flat panel direct view. Samsungs are fairly good - the most value.
That's my 2c worth - I've been fixing TV for over 25 years.
A picture or blank raster viewed from the front will have red marks if a portion of the image path from the green CRT to the front screen is blocked by debris or if the Green CRT is damaged from burn-in or other situations. If green is missing, red dominates virtually any image.
Severe CRT burn-in can occur when there is no sweep signal to a yoke. I have seen technicians removing yoke connectors on RPTVs in attempts to find shorted or suspect components.
Occasionally a damaged TV is sent back to customers as repaired and a service order for a new "fault or complaint" is initiated when the customer complains of the red or green marks or lines.
What you may have needed to do was adjust the
green & blue crt screens to match the red.
Go into your picture menu adjust, turn color
all the way down to a black & white px. Now
adjust each crt screen so that you end up with
a true black & white px. Then adjust each
focus control to get a sharp px, have your
tv on a channel like the home shopping
network so you can adjust each crt focus
one at a time for clarity by cover the other
2 up. Then go back into picure adjust & turn color ahlf way up, you should see a better