MY SONTY WEGA TRINITRON HAS A PURPLE HUE AT THE TOP OF THE SCREEN. ALSO THE CHANNEL DISPLAY WHICH IS NORMALLY GREEN ON COLOR IS NOW A RED COLOR

Clean or replace image chip.

since every display color monitors are only work with 3 primary color which are red, blue and yellow. You could also search it that by mixing these colors, you could get any color your want. Thats how color monitors work. Now in case of green color, it creates by mixing blue and yellow. When you are turning the screen adjustment screw, the red color plug will become lose, makes it appear green.
I hope your got the reason.

The color of the television are compose of three color RED,GREEN and BLUE.So the lost color is the green.The problem is in the color section of the CRT board in the chroma section and in the CRT socket board.Maybe theres a loose connection in the PCB like the cathode output transistor.

is it on aux video or in the tuner setting?

The color signal consists of Red, Green and Blue. Those three colors, at various degrees, make all the other colors on your screen.

If you have a BRIGHT green screen it's best you don't operate your set.
If it's just tinted green then there is a problem on the CRT (Cathode Ray Tube) drive board. Do check your "tint" setting and see if someone misadjusted it. If that isn't it then you need to have your set on an electronics bench and get an estimate for repair.

THERE ARE ADJUSTMENTS TO THE VIDEO DRIVE THAT CAN CORRECT THIS PROBLEM/THEY ARE IN THE SERVICE MENU. WITH THE POWER OFF, PRESS MENU-5-VOL+ POWER THE SET WILL COME ON IN THE SERVICE MODE. STEP THREW THE MENU ITEMS UNTIL YOU GET TO RED/GREEN/BLUE DRIVE THEN ADJ. TO BALANCE THE COLORS WHEN DONE PRESS MUTE TO STORE THEN POWER OFF ON THE FRONT OF THE SET OR IT WONT SAVE.

mt sony trinitron power light is blinking from green to red twise and then pause for 3 seconds and then blinks again from green to red

Kevin,

for the color problem,most likely you do have problem with loose contact of components from C-board ( small board connected at the back of CRT "picture tube" which drives every color and size of the screen)if you have knowledge with soldering electronic component parts, resolder this board and also check main board for possible loose contact.

cheers,
mark

Check any magnatic device near TV which causes purple color on screen. That device can be Speaker, Electronic toy, Watch like that carring piece of magnet inside. Remove that device and turn OFF your TV for half a hour, then power again. Hope the color will be fine n normal on entire screen.

Try turning down (off) the color during such an episode. If the image is tinted pink or green instead of black and white when you do this,you have either an intermittent short in your CRT (tube), which is terminal,or a gun drive problem, which may be repairable. If you're feeding it component instead of composite signal,it may just be a bad connection of the B-Y cable.