Small soldering accident :)

Banana Pi Router design BPI-R4/BPI-R4 Pro(MT7988)
1

Hi @all,

I have a BPI R4 and wanted to desolder the resistors R228 and R230 because of the i2c bug. But they were no longer installed and I unfortunately removed the resistors R104 and R105. Since I have installed an NVMe hard disk, I have to replace them.

My questions: Is it correct that both have 0 Ohm? Why were 0 Ohm resistors installed?

What type are the resistors, i.e. size of the resistors to purchase.

Thanks Frank

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2

0 ohm is basicly a bridge. Afaik these have to be simply removed,not replaced by any resistor value

3

If you have removed 0 ohm resistors, you can replace it with something else with 0 ohm:

Just use as small blob of soldering tin or solder one small strand of a flexible copper wire

4

I tried to measure! I could barely see them!

Circa 0.24 Ohms, which is equal to a zero-ohm resistor.

You are right :+1:

5

Thank You! I will bridge them now.

Frank

6

Unfortunately, I wasn’t able to fix the problem myself, as I only have a microscope which have to place directly on the PCB. So I took the board to a repair shop in Berlin, and they installed the bridge. They told me they assumed it was a filter. TL;TR, everything’s working again.

Thanks

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