After an attempt of repairing a sound socket on my Toshiba Satellite C850-D2K, the display won't turn on.
Before I replaced the socket by myself successfully, but this time it was just destroyed during an attempt to restore the contacts. So, I removed it. After that the display has not turned ON anymore.
I tried another RAM, all simple solutions like connecting laptop to a remote display, pressing shift+F something, replacing the battery, pushing buttons, removing the bios battery, vacuum cleaning the machine, etc.