Today we will share a repair case of an apple iphone 12 that is unable to transform on Press the power switch and the phone will not activate Connect the phone to power as well as the phone still will not activate Disconnect the screen Power up the motherboard Please be kept in mind that the time for powering up should not be too lengthy It can be seen that the current value is big The motherboard has a large current which suggests the motherboard is short-circuited Next off, we need to remove the motherboard and locate the faulty part for repair Action the diode worth of PP_BATT_VCC line with a multimeter The diode worth 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 connected in series by an inductor So the short-circuited PP_BATT_VCC line might additionally create the PP_VDD_MAIN line to brief circuit The old option to fix the large existing issue is via rosin finding With the melting of rosin, we can verify the faulty part Though the option is economical and also efficient, it has some imperfections The motherboard needs to be covered with rosin while the rosin is hard to clean up afterward In addition, we have to eliminate shielding covers on the motherboard for a thorough assessment There is no question that procedure problem will certainly be substantially enhanced Today we will present a more innovative as well as effective means to search for short circuit on the motherboard with the assistance of a Thermal Imager Camera The thermal imager situates the part of which temperature level is more than typical worth via infrared radiation The thermal imager can detect motherboard electric leakage within secs The malfunctioning components will certainly be discovered in no time once you place the motherboard under the electronic camera, tremendously boosting fixing performance While checking total motherboard working conditions, the thermal imager can identify damaged get rid of high precision Additionally, the thermal imager is an expert in spotting tiny electric leakage, short circuit as well as other troubles with very easy as well as secure procedure, substantially lowering the error price Firstly, we put the motherboard on the working system Connect the black probe of the direct power supply to the ground and also connect the red probe to PP_BATT_VCC line The temperature level on the top left corner has actually risen The faulty component can be validated on the leading left corner Open the bitmap We can see that PP_BATT_VCC line is out the leading left corner Considering that PP_BATT_VCC line as well as PP_VDD_MAIN line are linked in series by an inductor, we can evaluate that PP_VDD_MAIN line is short-circuited Via inductors of PP_BATT_VCC line, click another side of the inductors The opposite side is connected to PP_VDD_MAIN line We can once more determine the variety of faulty part It can be seen on the bitmap that the PP_VDD_MAIN line gets on the logic board Next, we separate the motherboard Placed the motherboard on the 170 ° C Heating Platform to warm Get rid of the motherboard After the logic board has cooled, power up the logic board Attach the black probe to the ground as well as link the red probe to PP_VDD_MAIN line Via the thermal photo, we can now verify the defective part The capacitor is flawed with charring Remove the capacitor Tidy the bonding pad with PCB Cleaner Gauge the diode worths of PP_VDD_MAIN line as well as PP_BATT_VCC line The diode values return to typical The short circuit mistake has been removed Then we recombine the motherboard Set up the phone to evaluate The phone activates usually WiFi and baseband function well IMEI number can be seen The mistake has actually been removed You can purchase the Thermal Imager Electronic camera on REWA store Please do not be reluctant to contact our account managers or customer support group for even more information Thanks for enjoying
