Hi again . . .
Now I'll share your my 2nd post of laptop repair.
Toshiba NB520 problem is no display, and I'm sure that problems was not caused by RAM,
because some problem of no display may be caused by it, but not this time.
After checking all, I found the problem on IC 3v and 5 v.
The 3v is supplying normally, but not 5.
So I have to replace the IC for supply 3v and 5v.
Before repair, we need to identifying what type of the IC.
The left picture is IC on the Laptop Motherboard, and the right picture the cropped from Schematic Toshiba NB520 of the IC RT8205E.
Just follow my step in this video, to replace it.
Ask me if you don't understand.
Please upvote if you like