HP Compaq 6520S Screen Dark ( Brightnes not work ) LCD Laptop - The keyboard Function FN +F7 and FN + F8 not work and power management to get brightness on baterai like power saver - balance - and high performance and adjust brightness not work - the problem is not on LCD and Inverter or Cable Flex - when you try to update bios - installing new os or etc not work. The Problem was In Regulator VGA need to reballing or Update winbond from external instrument work.
