PSP not working after using it with a faulty cable

Hi, I have a PSP without a battery and was playing on it by having it plugged into a powerbank constantly. After some time, the psp started turning off when the cable was at a certain angle. It didnt happen very often, so I just ignored it, but after a while the psp stopped turning on, not even the green light would turn on. I thought the cable has shortcircuited inside, and so I checked 2 fuses on the motherboard with a multimeter, but they seemed to be fine.

Any help would be appriciated, thanks.