Samsung 55" TV does not turn on

My samsung 55" rear projection tv will not turn on. When I plug it in, the musical chime sounds indicating it is turning on. The red light on the front will blink for a few seconds, then the tv powers off. No picture, no sound. The cycle just continues on and on until the tv is plugged in. A repair tech came out and replaced the power supply board. The tv worked for a couple hours and then I had the same problem again. The power supply board was replaced two more times before I was able to finally convince the repair tech that the problem was something else. He told me it was the digital control board. I was fed up with the service (and of not having my tv for over 6 months), so I told him I was going to try a different avenue or repair facility. Any help to at least confirm the issue before I try to get it repaired again will be greatly appreciated. Thanks in advance.

CHECK YOUR RED ,GREEN AND BLUE CRT'S THERE MAY BE A SMALL CRACK ON THEM.MAKE SURE TO TAKE THE YOKE OFF AND INSPECT THE ENTIRE TUBE IF THER IS A CRACK IT IS CAUSING YOUR TV TO GO INTO SAFE MODE. ALSO CHECK THAT NONE OF THE COOLING FLUID HAS DRAINED OUT OF THE TUBES ON TO THE CRT BOARDS IF SO REPLACE THE BOARDS AND CRT IF CRACKED. YOU CAN FIND ALL THE PARTS AT PARTSTORE.COM HOPE THIS HELPS.

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