Today we will certainly share a repair service case of an iPhone 12 that is not able to turn on Press the power switch and also the phone will not transform on Connect the phone to power and also the phone still won’t turn on Disconnect the screen Power up the motherboard Please be kept in mind that the time for powering up shouldn’t be as well long It can be seen that the present value is huge The motherboard has a huge existing which shows the motherboard is short-circuited Next, we require to get rid of the motherboard and situate the defective part for repair work Procedure 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 PP_VDD_MAIN line of apple iphone 12 are attached in series by an inductor So the short-circuited PP_BATT_VCC line may additionally cause the PP_VDD_MAIN line to short circuit The old service to repair the large current issue is via rosin spotting Through the melting of rosin, we can verify the defective component Though the option is cheap and also efficient, it has some drawbacks The motherboard needs to be covered with rosin while the rosin is hard to tidy up afterward On top of that, we have to get rid of protecting covers on the motherboard for a complete inspection There is no doubt that procedure problem will be greatly boosted Today we will present an extra innovative and also reliable method to search for short circuit on the motherboard with the aid of a Thermal Imager Video Camera The thermal imager situates the component of which temperature is greater than normal value via infrared radiation The thermal imager can find motherboard electric leak within secs The damaged parts will be found in a snap as soon as you place the motherboard under the camera, significantly improving repair effectiveness While checking overall motherboard working conditions, the thermal imager can determine damaged components with high precision Additionally, the thermal imager is a specialist in finding small electrical leakage, short circuit and various other troubles with very easy and safe procedure, considerably lowering the error rate Firstly, we put the motherboard on the working platform Link the black probe of the direct power supply to the ground as well as attach the red probe to PP_BATT_VCC line The temperature on the leading left corner has increased up The malfunctioning component can be verified on the top left corner Open the bitmap We can see that PP_BATT_VCC line is not on the leading left corner Because PP_BATT_VCC line as well as PP_VDD_MAIN line are connected in series by an inductor, we can evaluate that PP_VDD_MAIN line is short-circuited With inductors of PP_BATT_VCC line, click an additional side of the inductors The opposite side is attached to PP_VDD_MAIN line We can again determine the series of faulty part It can be seen on the bitmap that the PP_VDD_MAIN line is on the logic board Following, we separate the motherboard Put the motherboard on the 170 ° C Home heating Platform to warm Eliminate the motherboard After the logic board has cooled, power up the logic board Connect the black probe to the ground as well as attach the red probe to PP_VDD_MAIN line Through the thermal picture, we can currently confirm the defective part The capacitor is flawed with charring Eliminate the capacitor Tidy the bonding pad with PCB Cleaner Determine the diode worths of PP_VDD_MAIN line and PP_BATT_VCC line The diode worths go back to regular The short circuit mistake has been removed Then we recombine the motherboard Put together the phone to test The phone activates normally WiFi and also baseband function well IMEI number can be seen The mistake has actually been eliminated You can purchase the Thermal Imager Cam on REWA shop Please do not hesitate to contact our account supervisors or customer support team for more details Thanks for viewing
