Symptoms. My second hand TV (I traded it for a memory card and micro SD card reader) would not come on by either the remote or on switch. It would not light up or make any sounds.
Diagnosis: The diagnosis was that the TV was not receiving any power. After trying different wall outlets, and plugging in known working appliances, I ruled out that it was not a faulty wall outlet. (I would use a lamp but that doesn't work either). No sense in cracking open a TV and risking your life if the wall outlet is not working or not on at all.
Step 2: Step 1
Set the box glass side down. Unscrew every screw and place them in an organized fashion. After you remove the screw, carefully lift the plastic case off the front. Set it aside.
IF you know what your doing you can go ahead and discharge the tube. If your inexperienced like me just wear thick leather or rubber gloves and avoid touching anything other than the edges of the PCB and the fuse.