Bitcoin Forum

Hello All,

I bought a new S9 machine from bitmain. It worked fine for three months but then the machine shut down.

Checking the motherboard, we found that one transistor was damaged.

Does anyone know what the transistor model is in order to replace it?

The transistor is located next to the three capacitors blue and grey?

Thank in advance for your help.

This is one of those cases where a picture is worth a thousand words...

Here you go! :)

https://imgur.com/a/vNKdbvh

I'm pointing with the pen the damaged component.

buy removing this damage hashboard machine will turn on?? other two boards are working??? and warranty??

Is not a transistor. Is either a resistor or capacitor. Look at the same part on a good board and you will see a very tiny component number on the PCB next to the part, something like R123 or C123. If 'R' then is a resistor, if 'C' then is a capacitor. Then look at the good component itself and you should see a tiny number on it identifying the actual mfg part number. Search for the number on Google using  "resistor (or capacitor) <number>"  to find a supplier for it.

Just disconnect the ribbon cable and power from bad board and miner will run just fine with just 2 and even 1 hash board.

Thanks very much for your help.

I'm going to remove the hashboard and try to turn the machine on.

I'll keep you all posted.

Thanks again

If you have any other dead / scrap boards you can take the part you need from there instead of buying it online.

Honestly, the color of the part is brown or orange so it is not a resistor if you can check the hashboard circuit diagram it should be a C123.
Resistor color is black, you can check the image below as a sample of resistor and capacitor.

https://i.imgur.com/6z7M1DJ.jpg (https://i.imgur.com/6z7M1DJ.jpg)

According to OP's image, I don't see any name under the capacitor unless if you have hashboard schematic diagram?

@OP I think if you don't have scrap hashboard you can try to find capacitor in other devices like mobile phones just make sure its the same color and size and you must have a multitester to check if the board is shorted or not after you change the capacitor just to make sure no other components can be damaged due to shorted capacitor.

It's a capacitor, and based on the location, size, and big connection to the ground plane I'm guessing it's a filter/noise capacitor and not a part of the RC current sensing system. If you're good with a soldering iron and some chip-quik I'd say try removing it, then see if the board works. If it does replace it with a 3.3-4.7uf capacitor, that should provide enough filtering to reduce noise on the board.