I've taken on fixing a Vizio M3D550SL for my dad that has backlights but no picture. Thinking the main board is the issue since the t-con is part of that board, I was lucky to find a one on ebay since it isn't manufactured anymore or available anywhere. It was supposedly from a smashed screen set guaranteed but after swapping it out, still backlights only. I read about similar problem being the backlight inverter but all seem to check out on the volt meter. I dont know if the backlight inverters are good how or how or if it would change the multimeter readings. There's no physical damage to the panel. I am now confused as to where to pinpoint the problem. Once I got the main board (well packaged), I saw a video where the guy replaced a regulater. This board only has 2 and the voltages are virtually the same as the original boards regulaters but that doesnt mean this very well could be the t-con section on this board having the same problem. I'm leaning towards this since the flashlight test shows nothing and could be a board with the same problem Any suggestions from the far more experienced would be great?
Thanks, TJ
Thanks, TJ
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