Toshiba L650 Black Screen

[snowfun]

Hi everyone,
I have a problem on toshiba L650 with intel I5 cpu, no image in lcd screen,vga or hdmi, no logo in bios apears, but everthing works fine ..keyboard,operation system,sound etc. I know its works because i listen the sound of windows and the keyboard . Only i don't see anything on screen (internal or external screen).
I tested memory,reset bios with dessolder bat on MB..nothing, i remove battery.disconnect adapter and hold power button for 30sec but no luck...No image(black screen)
Note: The Laptop was working well before turn off

I don't no what causes this issue, please any ideas or anyone have a similar issue.

Thanks.

[Th3_uN1Qu3]

Re: Toshiba L650 Black Screen

Does this have the dedicated Radeon graphics, or integrated in the processor? If it has dedicated, most likely the Radeon GPU requires reballing. If it has integrated i would suspect the Intel PCH.

[snowfun]

Re: Toshiba L650 Black Screen

Does this have the dedicated Radeon graphics, or integrated in the processor? If it has dedicated, most likely the Radeon GPU requires reballing. If it has integrated i would suspect the Intel PCH.

Thanks for your feedback. Yes have dedicated Radeon Graphics but everthing works fine, many laptops with GPU issue not working or shutdown, Have i a corrupetd bios ??

[Life Goes On]

Re: Toshiba L650 Black Screen

That s little bit strange and specialy when you heard the sound from the windows, Did you check Cmos battery and also try it with other Cpu and Ram.

[BCConnectionLLC]

Re: Toshiba L650 Black Screen

If its booting then its a Display issue. I would start looking around the GPU and see what everything looks like. Maybe bad power rail or a faulty data line.

Youll need a schematic for the board.

[snowfun]

Re: Toshiba L650 Black Screen

The model is L635 and not L650, sorry by mystake

Motherboard:Inventec Bremen-10G BM10G-6050A2338501-MB-A03

Yes, I suspect the LCD panel because I hear the sound of windows,and keyboard works.My doubt is the VGA output and HDMI does not work.
I have change ram, only not change de Cpu ( It is necessary?? the windows works)

Thanks for the replys,someone will have the scheme of the board?

[sopik78]

Re: Toshiba L650 Black Screen

Agree with Unique, it seems to be GPU, do reball first and we'll see.

[dj_ricoh]

Re: Toshiba L650 Black Screen

if you take the lvds cable out and connect the board to hdmi and does not output then yes!
its GPU.

Toshiba goes straight to HDMI/VGA port if no internal screen connected.

It connects before BIOS finish to do the checks /post, before it starts to load the OS.

[vedoza]

Re: Toshiba L650 Black Screen

******help satellite c855 power on or not working with display please help me