I have not changed the resistor as you said the 300 should work... now removed again.
2.8v sounds low like something is pulling it down. I think you mentioned when you checked the input of resistors you saw 3.2v so it's not voltage drop at 2.8v. I wouldn't leave it like that too long in case it hurts the Pi pin. - from memory with the 300 resistor I had 3.2v - bridged 2.8v - I am only turning on the power board for testing then turning it off.
Since you have the resistor off the pad can you set you voltmeter to check current and touch probe to each side of resistor pad. It should be very low, I would think under 5mA but I have a feeling it's high and pulling the voltage down, not good. I believe the pin on Pi can tolerate about 20mA. The resistors do die if too much current goes through so maybe that's what's happening. Still not sure why though, maybe just a faulty PCB. There are no more components involved, just what you see on power bar.
Ok removed the bridge and tested the current.
Turned off - 0.8MA
Turned on - when the probes touched the resistor pads the outlet 4 turned on with a click and read 11.1MA
Hope this helps... where to from here?
thanks!
I did notice what looks like solder tracks... would this affect anything?
in the circle and D1 to the resistor etc
I removed them but if made no difference
![[Image: MOVkGzi.jpg]](https://i.imgur.com/MOVkGzi.jpg)
![[Image: 5zeZ5Kv.jpg]](https://i.imgur.com/5zeZ5Kv.jpg)
2.8v sounds low like something is pulling it down. I think you mentioned when you checked the input of resistors you saw 3.2v so it's not voltage drop at 2.8v. I wouldn't leave it like that too long in case it hurts the Pi pin. - from memory with the 300 resistor I had 3.2v - bridged 2.8v - I am only turning on the power board for testing then turning it off.
Since you have the resistor off the pad can you set you voltmeter to check current and touch probe to each side of resistor pad. It should be very low, I would think under 5mA but I have a feeling it's high and pulling the voltage down, not good. I believe the pin on Pi can tolerate about 20mA. The resistors do die if too much current goes through so maybe that's what's happening. Still not sure why though, maybe just a faulty PCB. There are no more components involved, just what you see on power bar.
Ok removed the bridge and tested the current.
Turned off - 0.8MA
Turned on - when the probes touched the resistor pads the outlet 4 turned on with a click and read 11.1MA
Hope this helps... where to from here?
thanks!
I did notice what looks like solder tracks... would this affect anything?
in the circle and D1 to the resistor etc
I removed them but if made no difference
