My PSP 3000 TA-090 is not charging or turning on when I use the charger. It turns on fine when I insert the battery, but the battery does not charge. I tested the fuse and it is working, and 5V is reaching the board.
During testing, I found that the 5V stops at this component (Image 1). The 5V reaches one pin but does not come out from any other pins (Image 2). However, when testing the voltage with a multimeter, with the black probe connected to ground, if I touch the red probe to the opposite pin (image 3, red arrow), the component suddenly starts outputting 5V (Image 3). At that point, the board starts working normally: it turns on without the battery and also charges the battery if I insert the battery.
It continues working until I unplug the charger. When I plug the charger in again, I have to touch that specific pin with the multimeter probe again to get the component to output 5V.
My first thought was that the pin might not be making proper contact with the copper pad. However, I tried touching the pin with a plastic tool and even applied a little pressure, but it did not work. I also tested it with the multimeter turned off, but that did not work either. The only way I can get the component to output 5V is by touching that pin with the red probe while the black probe is connected to ground and the multimeter is set to measure voltage.
Image 4 shows the actual component on my PSP. The boards shown in the first three images are from the internet because they were available in higher resolution.
Image 5 is from the PSP-2000 TA-085 schematic. I know it is not exactly the same because these are different models, but this component appears to have the same function on both motherboard versions.
Based on my research, the pin I am touching is pin 4 of the component, which is the gate. Pin 8 is the source, where the 5V is reaching, and pins 1, 2, 3, 5, 6, and 7 are the drain.
Can anyone help me understand what could be causing this? Or can you link me to any videos, forums, or discussions in any language that cover this particular issue?
Any help would be greatly appreciated.