lenovo no backlight

[peterfixit]

does anyone have any experience with the lenovo thinkpad t450, its come in with no backlight, I've looked for water damage or burned components and nothing, ive ruled out sections of the board that arent related to backlight. does anyone know where the backlight fuse/circuit is or have "some document that tells me where everything is on the board". thanks

 

[dukefawks]

Only 3 signals to the LCD. 19V, enable and PWM. Look up the pinout for the LCD and check voltages. Did this happen after an LCD swap with the battery installed?

 

[peterfixit]

I have never worked on one of these before so I have no idea where any of those are. The lcd was swapped but it was because there was no backlight

 

[dukefawks]

LCDs have standard pinout. It is either a 30 pin eDP or 40 pin LVDS. Google is your friend.