You have a myriad of different issues that would point to a few different things. The purple artifacting would point to a t-con board, the sound issue would point to the main board either shorting, or having some sort of malfunction. you can always try to get a Service manual, and reset the entire set. You can also unplug it for 12 hours or so to try to get the cap to completely drain. This would also effectively reset the TV's internal software. Sanyo TVs are disposable items. The ones we sold did well if they made it a few years. Depending on how much work/time/money you want to toss into it, you can replace it with a current model for about $200. My company didn't repair, or even give estimtes on them due to the high repair costs vs. replacement.