Turned it on and after an hour I heard a sizzle and then a small black puff of smoke came out the back at the top right. I still get sound but the picture only comes on for less than a second and then the screen goes blank and I can still hear the audio.

Black smoke is too much fuel. My guess would be that there is an injector that is stuck open draining the pressurized fuel into a cylinder or several cylinders. And that is a considerable amount of fuel. And it would account for the hard start because there isn't any fuel being pumped into the other injectors until the pump builds the pressure back up.

of course check the compressor for malfunction but that would never explain a puff of smoke in the cab what did the puff of smoke smell like just a water vapor electrical, rubber,

Thats the Inverter board. Your model used several different types which are not interchangeable. You can get the correct Inverter Board for your model by contacting the guys over at www.tvrepairworld.com

I hope you unplugged your unit or tripped the breaker. If they are bright red then you have an electrical short that should have tripped the breaker a long time before they turned red hot.

Most likely the water from defrost was sizzling and your defrost heater has burned out. The unit won't defrost and your heater assembly needs to be replaced if that's what happened

First make sure all bat. terminals are good then remove and clean along with bat. posts. Next look for fuse link and make sure it is good

you have a burnt board thats going to need replacing.that was the pop you heard and the puff of smoke.

sounds like the ignition switch shorted out like a wire was rubbing and im sure it blew the fuses your going to replace the egnition switch and repair any wire thet is bad and replace the fuse

Hate to say it but you have to start tracking wires... Start from your battery and go from there. Sounds like a possible fusable link that blew but the only way to tell is checking for power from battery cables. keep me informed.