Television and Home Theater

Hello all, I have the Sony Bravia KDS-50A3000. When I turn it on the power light goes green then turns red and flashes 3 times in sequence. I have replaced the bulb. It still does it. I have tried researching the problem and have found differening solutions. One says its the lamp door sensor another says it's either the power board or logic board. I am hoping someone here can give me a more definitve answer. Thanks.    

Flickering picture, Sometimes it will look good, A/V same thing. P/S looks ok. T-con? or main board?, how to tell which one? anyone have any info on this one? Thanks Charlie

This is my first post. I have a 2002 model Mitsubishi WS-65819. It has two STK392-570 convergence chips that were replaced by a technician in 2010. Recently the picture suddenly went into the classic "bad convergence chips" view: curved 3D with rainbow colors across the entire screen. This time, I replaced the convergence chips and it fixed the problem EXCEPT the very lower left corner of the picture is still distorted and has a red "shwoosh". This problem occurs when I have HD component input. When I try to adjust the convergence,