Hitatchi ultravision 70 in rear projection

the tv when power on , picture comes on and then dims out in about a min.. then i turn off and turn on. and same thing. after that couple times it will stay on for hours and then fade in and out. the magic focus button works. but the red is not in line with blue and green.but not too far off. thanks for any help i can get model number if needed. my thoughts are to fix the red is enter in the DCAM or replace ICs but not sure on the picture bright then dim bright then dim