Hi @alex955 ,
The following is just trying to isolate what the problem may be as it seems that with multiple failures there should be a common factor and the only common factor I can think of at the moment is a power supply problem to the affected components.
The keyboard and touchpad are both handled by the keyboard controller which interfaces them to the motherboard chipset (southbridge) whereas the LCD panel is connected directly to the northbridge chipset. this chip also handles the display to the external screen so presumably it is OK
Try shining a torch at an angle close to the laptop screen to check if there are any images being displayed after the laptop has booted. They will be very faint if they are there at all, so trying this in a darkened room may help to see them. If they are there then there is a backlight problem i.e. power problem
You could also try a power refresh in case it is a corrupted BIOS.
Here’s the maintenance and service guide for the laptop. Go to p.116 to view the necessary pre-requisite steps and then the procedure to remove the systemboard.
This is just to gain access to the board and not to remove it.
The power refresh involves the following:
Turnoff the laptop and disconnect the charger if connected.
Remove the main battery.
Disassemble the laptop to access the motherboard and then remove the coin cell RTC battery from the motherboard. Note the orientation of the battery before removal. Usually it is +ve on top as marked on the battery.
Press and hold the laptop Power button for a full 30 seconds and then release it.
Reverse the above procedure and then try starting the laptop and check what happens with the display.
If still no good then the voltages on the motherboard need to be checked. Here’s the motherboard schematics that will help with this.