Dell 5480 display only through HDMI. Total blank screen

[Andreasbest]

Hello.
I have a Dell 5480 that show display only on external, through HDMI.
It's own display is completely dead, total blank, i checked with lot of light to see if backlight is dead but no, nothing at all.
I want to check all possibilites before order a new screen so any advice welcomed.
Schematics attached, bought them for dirty cheap (my mb is rev 2.0 and schematics are rev 1.0 though)
Thank you!

[Vesko356]

Re: Dell 5480 display only through HDMI. Total blank screen

Hello.
I have a Dell 5480 that show display only on external, through HDMI.
It's own display is completely dead, total blank, i checked with lot of light to see if backlight is dead but no, nothing at all.
I want to check all possibilites before order a new screen so any advice welcomed.
Schematics attached, bought them for dirty cheap (my mb is rev 2.0 and schematics are rev 1.0 though)
Thank you!

Reflash the bios first, after that F2 and load setup defaults.
If that doesn't work we can measure some voltages on edp connector.
But first try with the bios - same story with E5470 few days ago, everything is OK after reflash.

[Andreasbest]

Re: Dell 5480 display only through HDMI. Total blank screen

Reflash the bios first, after that F2 and load setup defaults.
If that doesn't work we can measure some voltages on edp connector.
But first try with the bios - same story with E5470 few days ago, everything is OK after reflash.

Forgot to mention i flashed bios already and enter bios successfully on external screen, set new service tag (for some reason old one gone), load bios defaults and reflashed bios through F12 bios update menu successfully.
No luck.

[Andreasbest]

Re: Dell 5480 display only through HDMI. Total blank screen

Confirmed screen problem, i attached a broken one i had here and worked fine.
Do you think it's worth it to have a look at screen pcb?
Both fuses seem ok.

[Vesko356]

Re: Dell 5480 display only through HDMI. Total blank screen

Confirmed screen problem, i attached a broken one i had here and worked fine.
Do you think it's worth it to have a look at screen pcb?
Both fuses seem ok.

Just replace the screen in this case. Playing with powered screen board is kinda risky business to guide you at a distance, one wrong move can cost you, so if you want we can take some basic voltages, but I don't think it's worth it. Second hand screen is ~ 40 euros, just replace it and move on.

[Andreasbest]

Re: Dell 5480 display only through HDMI. Total blank screen

Just replace the screen in this case. Playing with powered screen board is kinda risky business to guide you at a distance, one wrong move can cost you, so if you want we can take some basic voltages, but I don't think it's worth it. Second hand screen is ~ 40 euros, just replace it and move on.

Yes, i found FullHD for 62€ brand new, while this is simple HD. Ordering now.
I'll open a new and last thread for a faulty HP 800 G3 mini but i can't find schematics.
Thank you!

[Vesko356]

Re: Dell 5480 display only through HDMI. Total blank screen