A lot of time to judge the chip is good or bad, generally find the classic voltage or classic ground resistance of each chip foot (welding is on the circuit board), but even if the ground resistance or the ground voltage of each foot is inconsistent with the data, it may be caused by peripheral components, which can only be used for reference, when the peripheral components are excluded, you can have a relatively large grasp of the chip damage Can find the maintenance of induction cooker information, generally have. Now a lot of maintenance, will not test whether there is a problem with the IC, but estimate which aspect has a problem, directly replace, if the fault is eliminated, it shows that there is a problem.