Induction oven eight-pin power chip test method: you can first find out the GND foot, and then use the diode file, red pen to connect to GND, black pen respectively test different feet, see whether the resistance value is about 0.5, if there is a description is good, if there is no that is open circuit, if it is 0 that is short circuit, 8-pin power management chip is often used in electric car charger, The flyback switching power supply circuit is composed with a small number of peripheral devices.
The chip class generally only has a good component, the comparison of the measured value, the same value is generally good, such a measurement is not very accurate.
The voltage can also be measured online, the input terminal (4-8 pins) voltage is about 300V, the ground terminal of 1-2 pins is 0V, and the feedback input of 3 pins is about 0.5V when normal; Pin 4 normal voltage is about 24V.
Octagon power chip test is good or bad, first observe whether the corner of the eye is normal, whether the corner of the eye is broken, and then use a multimeter to measure the resistance of the power chip chip pin is short circuit, if there is a short circuit indicates that the chip has been damaged internal damage, this chip can not be used in normal, need to replace a normal chip to replace.