Raspberry Pi 2 B Power Switch Soldering Help

[Blizz1220]

Maybe this would be the cause ?

"If there is a +5V on the original  Playstation power supply, it think it is mainly used to powered  controllers and some other small part of the console. This mean the +5V  power supply has not been designed to deliver a lot a current. It  probably can not deliver enough power for the Pi. If you request too  much current, in the best case, the voltage will fall and the Pi will  hard reset. In the worst case, the Playstation power supply can burn.
So, it can be a good idea but we must check if the power supply is able to deliver enough current for the Pi."


If there is not enough current (under load not when disconnected) then something like you said (power led on but no power) could happen.


I just a assumed that red wire is Playstation PSU 5V rail , if not ignore post ...

[Blizz1220]

Then I have no idea , something is stopping power (and probably
it's some sort of a fuse if everything is connected ok).

[Blizz1220]

I see.Well , you can follow 5V line from the psu (but be careful) to the
Pi and measure volts.If there is around 5 V +-0.25 to some point and then
drops to close to zero there it is.It can be SMD resistor (black little things).

When you removed the fuse you soldered contacts back with wire I
take it.

Sorry , but without seeing it it's kinda hard , if you are trying modification
like that on site you linked maybe ask there ?

[Blizz1220]

I take it black wire (ground) is connected to Pi to wherever it should be
connected ? (last resort It should say GND.