I have 2 PSP Slim, both have the same problem. The history of the psp black dropped from 4 feet, psp skyblue run over by a car inside in my pack pack, only the LCD broken and replaced it.
::Diagnostic and Repair::
Both I try to resolder the ZIF and luckily the display backs to life of my PSP SkyBlue, then after 2 hours back to the old problem, no display,
but the LED back light is still working, I can adjust the brightness level, and I can hear the psp boot up sound, I can tick sound if I move the D pad from left and right, and press O and X, so it means the Software is still working, but there is no display.
See the video here.
Video003.3gpThank you and good day to all.