Identifying a damaged components on Pi 4 B board

I burnt what looks to be either a diode, capacitor, or inductor on the board near the power connector of my PI 4B. I want to repair it :slight_smile: but I know the chances are slim.

Any idea on what that component would be?

Cheers,

1 Like

Hi Farhad
Put a resistor in that list and you have got just about all the possibilities.
Cheers Bob.
PS, sorry, I don’t know.

2 Likes

This is a reduced schematic of Raspberry pi 4. This may help too: https://datasheets.raspberrypi.com/rpi4/raspberry-pi-4-reduced-schematics.pdf

4 Likes

If you consider how it got burnt then that will give a clue as to what part of the circuit was likely affected. It looks like L1. If so, then considering that this is rated at 1.7A then it is likely that one or more other components are also destroyed, so repair would probably not be worthwhile.

5 Likes

Agree.
It is the inductor through which 3V3 is supplied to the whole board and GPIO bus. (thanks @tepalia02203352 for schematic link)
There would have to be a large current draw to burn it out. Possibly it happened over time. A short circuit should have tripped the internal protection of the regulator chip. Unsure though.
The amount of current available at the GPIO 3V3 pin is very limited.
As @Jeff105671 said, how was it connected is the consideration and what was the the Pi 4 doing at the time.

Regards
Jim

3 Likes

Most probably, it happened due to a short circuit formed when I was wiring a prototype.

image

2 Likes

Oh No! Looks like getting a new Raspberry pi is the only option now. However, I think there is a cheaper alternative. For many projects, you can consider Raspberry Pi Pico as Raspberry Pi 4B is quite expensive now a days.

2 Likes