... pulverize the solid sealing compound first, then clean it up. You may adopt other method as sol/hydrosol. ... avoid burning out the chip.FWhen achieving the set-up lamp temperature, Once the solder liquefied and melted, ... automatically.After cooling the chip, pick up the PCB board, check if it is ok. If not, re- ... of the part which is being unsoldering, and it will up to the temperature in 3-5minutes. Then ...