Laptop repairs.

[marco]

My 19v, 5v and 3,3v "Always On" voltages are on but my laptop stays dead. I have even shorted the 3.3v to ground with no avail. It shows that it goes to zero when grounded but nothing happens. No lights come on.

I have checked both mosfets and the 2 caps on both sides of the supply (adapter and battery) and they are good.

Do you think the BIOS/UEFI chip is corrupt? The PM chip must be good as the volts are all there. Please help as the laptop is new but no guarantee as I formatted the drive to download Linux.

 

[airborne]

Why would the laptop have no warranty if you've installed Linux, never heard of that before?

 

[marco]

I formatted the C drive as it was only 32 GB embedded. I cannot reflash the EEPROM chip with the latest BIOS if the laptop is dead. I would need a EEPROM dedicated loader to do that. Is there another way?

 

[thehuman]

You need schematics and common knowledge what to test . Shorting out certain rails will make let magic smoke out . Must have taken it to service centre from beginning. Too late now as you opened laptop up

 

[AirWolf]

You have a 32GB paper weight.

 

[Hectic]

If there is 3.3V on pin 8 of the Bios chip, I think your Bios chip should be okay?

 

[marco]

You need schematics and common knowledge what to test . Shorting out certain rails will make let magic smoke out . Must have taken it to service centre from beginning. Too late now as you opened laptop up ��

The only way to start up a computer is to short the 3.3v to ground to bring it to zero. No smoke as the chip will prevent too much current flow to ground. All laptops work this way.

Schematics are good but most laptops use the same configurations for the basics on the motherboard so no need to have schematics for every model.

 

[marco]

If there is 3.3V on pin 8 of the Bios chip, I think your Bios chip should be okay?

Thanks. I will check that out.