well first of all there are no fuse in these mp4 players.To start with is that you must be using the DC POWER SUPPLY so open your player and take its battery out and put the + and - cable in the place of battery in the MP4 and power ON the supply with the 3.7 volatge and then power ON the MP4 and then see it remains power ON or not and how the screen come and what the supply is doing ........mean the voltage is dropping or they are stable..........and you can also put your finger on the components on the MP4 to get the idea if any component is over heating.This from where you can start........... i think
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