Can someone please help me identify this resistor?

[R_J]

I don't know which igbt you have, you would need to remove it to see the number, but this Sanken one should be close to show you what is internal
If the current resistor is blown open, one of the internal igbt will be bad and I would check what motor it drives is not also damaged

This whole board can be ordered from ali exp, might be cheaper than repairing as these igbt's are not cheap by themselves.

[lotas]

I think I’m understanding now. So likely the IGBT module shorted, causing the current sense resistor to burn. Also this IGBT shorting also may have possibly caused the processor to go out.

It is possible, but not always, it depends on luck, remove the module, you can use thin nippers to bite off all the legs, then unsolder each remaining leg, check the resistance of the processor power supply, and then test it (here this processor also has its own internal firmware).

[mitsu2k]

Lotas, I removed the current sense resistor. I had assumed it was 100% open because of how badly it was burned but apparently it was not. After removing it, I measured 280 ohms between these pins in the photo as you explained. Is this better news?

btw, the motor it drives seems ok. I have two of these mini split units so I took the board out of the good unit and put it in the unit that had this bad board, and it seems to be working normal.

[mitsu2k]

Lotas, I want to thank you so much for your kind help. You spent A lot of time with me and spared me a huge headache. I am going to take your suggestion and find one on Ali Express. Thank you again. You are a boss!

[mitsu2k]

I don't know which igbt you have, you would need to remove it to see the number, but this Sanken one should be close to show you what is internal
If the current resistor is blown open, one of the internal igbt will be bad and I would check what motor it drives is not also damaged

This whole board can be ordered from ali exp, might be cheaper than repairing as these igbt's are not cheap by themselves.

Thank you R_J. That datasheet was helpful in getting an idea of how it works.

[lotas]

Search by this number, since such a board can have different configurations and different firmware for compressor power.

[mitsu2k]

I could not find anything with those specific numbers. Only the numbers on the PCB itself

[mitsu2k]

The IGBT is fried. Big hole on the underside. Problem is I cannot find a replacement unless I want to get what is likely a fake one from eBay. I have had bad luck with that in the past

Also I should mention that I ordered a new board on Aliexpress. After ordering it, The seller wanted me to upload photos of my old board for compatibility confirmation. After doing so, they said that the board I purchased will not work for me. However, they said they had a used board that would work. Well, after waiting 3 days for them to ship, They messaged me this morning saying that I need to cancel the order as the board is not available. So now I'm stuck.

[lotas]

https://aliexpress.com/item/1005008810094554.html

[mitsu2k]

Hi Lotas, would you trust this one from AliExpress?

[lotas]

Hi, it's 50/50 luck, I've ordered many times, sometimes I've found used ones, but they work, and the price is not high and the reviews are good, you can take a risk.
If you decide to order, don't forget to click on your specific option.