i have a toshiba satellite L300 and i recently took it apart to fix the usb ports, when i put it back together the screen didnt not turn on.
everything turns on fine, but the screen stays black as if its not plugged in. i plugged in a monitor to the laptop but this still didnt work!

Maybe one of the memory modules is not seated correctly. Try reconnecting memory modules.

I have a toshiba satellite L30-113. When the power button is pressed the power light comes on for about 3 seconds then goes off. The fan runs for the same amount of time then stops. I have replaced the motherboard, processor and fan. Still the same. I even changed the ram out and still the same. The hard drive I have taken out and read from it on my other laptop and all the files look fine.

Help I am stuck as to what to do next?????????

I hope it’s not just a bad AC adapter. Maybe it’s not working when loaded? It’s unlikely but possible.

Looks like you’ve replaced all main parts but no help. Now you’ll have to minimize the system as much as possible and see if it works when minimized.

Leave just motherboard, CPU and memory. Make sure the CPU is LOCKED in the socket. Make sure RAM seated properly. If the system still turns on for 3 sec and turns off, most likely it’s defective motherboard.

Help I am stuck as to what to do next?????????

Thanks
Mark

I Currently have a Satallite L30 with dim screen, checked the inverter but thats ok, seems that its a problem with power going to the inverter from the motherboard
The Screen is OK, as Ran another invertor from another laptop to power the backlight.
So, anyone know of a common fault on the motherboards than can fail to provide the power???

Could be the video cable failure (not common but happens).
Could be stuck lid close switch. Maybe the switch is stuck in the closed position and the laptop “thinks” that the display is closed even though it is opened. This is also not very common failure.

Dont know whats going on with Tosh’s these days but had so many over the last 7-8 years with backlight faults!!

I have an L30, and it has a screen fault, the laptop powers up and the screen illumination is ok, but instesd of graphics I get horisontal and vertical lines on the screen, they are colourfull and bright, also if conected to external monitor I get a normal display

1. Try reconnecting the video cable on both the motherboard and LCD screen.
2. Try replacing the video cable.
3. Replace the LCD screen.

thanks John