Today we will certainly share a repair situation of an apple iphone 12 that is unable to switch on Press the power button and the phone will not turn on Attach the phone to power and also the phone still won’t activate Disconnect the display screen Power up the motherboard Please be noted that the time for powering up should not be as well long It can be seen that the current worth is big The motherboard has a big present which shows the motherboard is short-circuited Next, we need to get rid of the motherboard as well as situate the damaged component for repair work Measure the diode worth of PP_BATT_VCC line with a multimeter The diode value is 0 It can be confirmed that PP_BATT_VCC line is short-circuited PP_BATT_VCC line and also PP_VDD_MAIN line of iPhone 12 are attached in series by an inductor So the short-circuited PP_BATT_VCC line might additionally trigger the PP_VDD_MAIN line to short circuit The old remedy to fix the huge present trouble is via rosin detecting Via the melting of rosin, we can verify the faulty component Though the solution is economical as well as reliable, it has some drawbacks The motherboard has actually to be covered with rosin while the rosin is hard to cleanse up afterward In enhancement, we have to remove protecting covers on the motherboard for a detailed assessment There is no question that operation difficulty will be substantially boosted Today we will introduce a much more innovative as well as reliable method to try to find short circuit on the motherboard with the help of a Thermal Imager Video Camera The thermal imager finds the component of which temperature is greater than regular worth using infrared radiation The thermal imager can spot motherboard electrical leak within secs The malfunctioning components will be detected in no time at all once you place the motherboard under the camera, tremendously boosting repair efficiency While examining general motherboard working problems, the thermal imager can pinpoint damaged parts with high accuracy In addition, the thermal imager is a specialist in identifying tiny electrical leakage, short circuit and also other problems with simple as well as safe operation, substantially reducing the error price First off, we placed the motherboard on the working system Link the black probe of the straight power supply to the ground and link the red probe to PP_BATT_VCC line The temperature on the leading left corner has increased up The defective component can be validated on the leading left edge Open up the bitmap We can see that PP_BATT_VCC line is not on the top left corner Because PP_BATT_VCC line as well as PP_VDD_MAIN line are linked in series by an inductor, we can judge that PP_VDD_MAIN line is short-circuited Via inductors of PP_BATT_VCC line, click another side of the inductors The other side is attached to PP_VDD_MAIN line We can again identify the series of malfunctioning component It can be seen on the bitmap that the PP_VDD_MAIN line is on the reasoning board Following, we separate the motherboard Placed the motherboard on the 170 ° C Heating Platform to heat Get rid of the motherboard After the reasoning board has actually cooled down, power up the reasoning board Link the black probe to the ground and attach the red probe to PP_VDD_MAIN line With the thermal photo, we can now confirm the malfunctioning part The capacitor is flawed with charring Eliminate the capacitor Tidy the bonding pad with PCB Cleanser Determine the diode worths of PP_VDD_MAIN line and PP_BATT_VCC line The diode values go back to normal The brief circuit fault has been removed After that we recombine the motherboard Set up the phone to check The phone switches on typically WiFi and baseband function well IMEI number can be seen The mistake has actually been eliminated You can acquire the Thermal Imager Video camera on REWA store Please do not think twice to call our account supervisors or customer care group for more information Thanks for seeing
