No backlight after LCD replacement

[MrBojangles]

This is the second time this exact scenario happens.

Client comes in with a damaged LCD (screen busted, image showing). I buy a new LCD and install it. It's a small laptop and there is only one cable going to the screen from the motherboard so no separate inverter.

New LCD shows an image but no backlight! I change back to the old, broken screen, shows nothing! No image and no backlight where there was before.

I'm 100 % sure that I didn't damage anything physically while swapping these out. What is happening? I can only think of static electricity since I dont use an LSD bracelet but c'mon that's gotta be the lowest of the low chances right?

LCD replacements used to be my favorite type of repair because it's fast and easy but now I don't know anymore.

 

[jmitservices]

Have you checked to see if there is a fuse on the motherboard for the backlight?

 

[mr m]

X2 on the fuse since the panel uses an LED backlight.

The tiny SMD fuses are easy to Ohm out and replace but not always easy to find. The fuse is usually next to the panels connector on the mobo but not always.

 

[Larry Sabo]

if you didn't ensure the battery was removed before and during LCD removal and installation, it's probably the fuse on the MB.

 

[cam w]

What make and model laptop? Maybe check for stuck/faulty lid close switch?

 

[Krynn72]

Send me your LSD bracelet if you're not going to use it!

Does an external monitor work?

 

[MrBojangles]

Send me your LSD bracelet if you're not going to use it!

Does an external monitor work?

Yeah.

I dont think I removed the battery so that might be it... I didn’t know this could happen

 

[Larry Sabo]

Most of us have done that, once. Welcome to the club.