Did you check that IC if it has a number or letters read them and try to search it through Google and maybe you can find the same IC.

If it is HMBWA under that IC then there is a trusted supplier that I know where you can buy it.

Check this link https://www.zeusbtc.com/ASIC-Miner-Repair/Parts-Tools-Details.asp?ID=1223
You can also try to ask them if that IC is what exactly you looking for.