Yeah its impossible to convert a video from its current quality to better quality you can stretch the video for bigger ratio, but its quality will decrease.
better option is take it to service ceter do not try to open it all by your self or you might be stuck in some other kind of problem other than over heating.
Hi there brother it is possible or you can say if lcd did not support vga cable than it is not possible other wise every laptop supports vga cable and external monitors.
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