Only blues or cyans means that the red signal's not reaching the display driver. Use a different input or a different cable and see if it changes things.

If the display's the same regardless of input (tuner, SCART, composite, VGA or HDMI) then yes, it's most likely fucked.

It might be something simple like a loose ZIF connector on the input board of the TV, but you'd have to open it up to find out