Try it without the battery hooked up and only the Ac Adapter hooked up.
If the psp still cuts out after 3-5 seconds then that means its a problem with the main board.
If the psp doesn't cut out then that means the battery is either bad or to much power is drained out of it and needs to be recharged fully.
You also can still try to try a different ac adapter just to be sure if the cord is to tangled up cause tangled up wires can cause the wires to break inside of the rubber casing.
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