Are these measurements from the non-working board?
Compare these readings with the working board.
Do you have caps key light toggle?
External type c to hdmi produce video?
Test for usb activity on each usb port. See if a thumb drive led flickers on each port.
Dont have Caps Key Light.
The Power Button is Working.
Pressing it Switches off the Machine (the trackpad doesnt press) and then again switches on using the power Button.
There is no external display with and without the LCD connected.
This video output is checked after installing both boards on the body with battery connected and booting the machine.
The bad board doent boot. But has fan spin etc.
On the hub, can you insert a usb flash drive? Do you see activity on the usb flash drive? Test on the working and non-working boards.
Do you have the tools to reflash the BIOS?
One thought is to remove the good bios on the good board. Keep the good bios aside.
Then take the bios from the non-working board and apply to the working board.
Does the working board continue to work?
This should confirm if the bios is not corrupted.
I don't have the tools do flash the bios but i can get that arranged locally.
Flashing the BIOS will remove the Data ? ( I have absolutely no idea about this)
Bios is used to boot up the logic board. It is the first code used to start up the board. Data is on the ssd of this logic board. That is, ssd could be blank but the bios firmware still will offer the power up apple logo. The operating system from the ssd or internet follows afterwards.
It is only an attempt but perhaps the main bios is corrupt. We do not want to alter or risk the known good bios so best to remove and place it aside.
From the resistance, do not think the CPU is dead but not 100% sure.
Do check for usb activity on both boards to gauge the differences.
Wish to be clear that we do not want to erase or write to the flash device.
Bios is used to boot up the logic board. It is the first code used to start up the board. Data is on the ssd of this logic board. That is, ssd could be blank but the bios firmware still will offer the power up apple logo. The operating system from the ssd or internet follows afterwards.
It is only an attempt but perhaps the main bios is corrupt. We do not want to alter or risk the known good bios so best to remove and place it aside.
From the resistance, do not think the CPU is dead but not 100% sure.
Do check for usb activity on both boards to gauge the differences.
Wish to be clear that we do not want to erase or write to the flash device.
Only apply the flash from one board to the other.
Which programmer will you recommend ?
Also the bad board is bad board is drawing more amps than normal. I will tell you the exact voltages tomorrow .
Comment