I can't physically repair your PSP, but here's a systematic troubleshooting checklist.
PSP/GAME/UPDATE on Memory Stick).vsh.txt / game.txt for conflicting plugins.Wi-Fi module (daughterboard on 1000/2000/3000; integrated on Go/E1000) can fail. Symptoms: "Cannot find access point" despite strong signal. Replacement modules are $10–20; requires disassembly.
If all else fails: PPSSPP emulator on PC/phone with your dumped ISOs + adhocserver for online play.