The inverter board for my laptop (Vaio FE series) LCD panel is buzzing loudly when the brightness controls are adjusted down though not when on maximum. There is also screen flickering so I suspect it's about to fail. I have sourced a replacement which works, but the screen is significantly dimmer and the brightness controls no longer function.
The original inverter was Tamura branded model HBL-0341 dual lamp inverter. The new inverter is the same design though with a lot less circuits (edit: components).
- What is likely fault with the old board and can it be repaired?
- Why can the brightness not be adjusted with the new board?
Edit: picture added, old board top, new board bottom.