That will be a perfect way to toast all 30 asics including the 29 chips which are likely working just fine at the moment, asic boards are very different from those GPUs (this does not mean this method will actually work and not damage a GPU) but the chips on these boards have a max temp of 100c or below depending on the model, putting them under heat for 10 mins will most likely break all of them, please don't do that, follow the proper method of fixing the soldering on the bad chip.