Question : Problem: Dim Display - Improperly Connected Screen Inverter?

I had a Dell Inspiron 9400 with an image on the left 1/4 of the display and black 3/4 of the screen.  I swapped out the screen inverter.  Now, the entire display shows an image, but it's very dim.  Adjusting the screen brightness has no effect.  Did I connect the inverter improperly?  

Answer : Problem: Dim Display - Improperly Connected Screen Inverter?

Possibly.   Did you also replace the bulb?   Your symptoms sound more like a defective bulb than a defective inverter.   If you're fairly sure you installed the inverter correctly, replace the bulb too (it's much less expensive than an inverter).