Hi.
I am kind of a noob but I try (hard) to learn fixing Lenovo Notebooks.
Currently I'm working on Yoga 460 (LCL-1 / 14283 -2).
The first problem that I see is that 3.3v ist kind of shorted to ground.
Unfortunatly I haven't found any Schematic to this board (or similar)
kind of shorted to ground because:
the big (I/O Chip) gets 3.3v (and other points on the board) but the Bios Chip is shorted to ground and the biggest Problem is: I can't find the damn 3.3v PowerRail.
I messured every coil at least 10 times. All coils (except 1) are 0.00v.
Should there be a coil with 3.3v?
0.222v, idle consumption is 19v / 0.023amps.
It's not very important to fix this board it's more for education purpose.
Can anyone someone help me / guide me to troubleshoot? Next I wanted to apply 3.3v with external power supply to find the short (hot component) but as I can't find the powerrail I don't know where I should apply the voltage.
I also tried to search the board randomly in diode mode to find a link from working 3.3v to some power supply ...but with no success. weird.
I am kind of a noob but I try (hard) to learn fixing Lenovo Notebooks.
Currently I'm working on Yoga 460 (LCL-1 / 14283 -2).
The first problem that I see is that 3.3v ist kind of shorted to ground.
Unfortunatly I haven't found any Schematic to this board (or similar)
kind of shorted to ground because:
the big (I/O Chip) gets 3.3v (and other points on the board) but the Bios Chip is shorted to ground and the biggest Problem is: I can't find the damn 3.3v PowerRail.
I messured every coil at least 10 times. All coils (except 1) are 0.00v.
Should there be a coil with 3.3v?
0.222v, idle consumption is 19v / 0.023amps.
It's not very important to fix this board it's more for education purpose.
Can anyone someone help me / guide me to troubleshoot? Next I wanted to apply 3.3v with external power supply to find the short (hot component) but as I can't find the powerrail I don't know where I should apply the voltage.
I also tried to search the board randomly in diode mode to find a link from working 3.3v to some power supply ...but with no success. weird.
Comment