Re: VIZIO M50-C1, powers on, no backlight, no picture

This is an older thread, but I had the exact same issue with an M43-C1. After trying some other suggestions I landed here and followed your advice of heating up the section of the main board behind the heat sink. And it worked! My question is, why? And why isn’t it a permanent fix? Is the heat reflowing solder, or something else? Are there particular components that need to be reseated/resoldered?