the avi video on vtech are of low resolution ( see image with tech details) so convert your video's (flv, mov, mpeg, mp4, ...) to this format with the tool "pazero coverters suite" (free tool with no nasty malware) I use the stereo, 30 frames/sec parameters, it works fine ! (see image with parameters
if everything is working i would think there is a memory problem, have a looking in memory and see if there is a format fertility, if not you will need to conect it to a pc and use the pc format on the vetec to reformat the memory for photos and video, its not the system memory and is safe to format.
Common problem with Lg sets as with Samsung it most likely requires Power supply repair kit off of ebay however you did not state model of set so I am guessing your not an engineer, so my advise would be contact your local repair man it is cheaper than a new set if you don't know what your doing. and of course you should always remember electricity can prove fatal.
