Solder paste column M705, flux, board washing drinking water with complete Alcoholic beverages; board washing water is made use of to clean up the solder residue just after repair; thermal gel (specification: Fujipoly SPG-30B) is used to smear the floor with the chip right after repair ；ball-planting steel mesh, https://reidfares.thechapblog.com/30825826/antminer-s19-hashboard-repair-fundamentals-explained