Is my big screen junk????

Hey guys I have a Mitsu big screen. I think 52" projection, its like 98’. It just started this today… the lights will dim about 5 times, then stop, then after about 30 seconds the lights will brighten about 5 different shades and it will be back to normal… then it will wait a min or so and do it again. Is this just a bulb or something??

Thanks everyone

probably convergence amplifiers. jiabano.