Today we will share a repair situation of an apple iphone 12 that is not able to activate Press the power button and the phone will not turn on Attach the phone to power and the phone still won’t turn on Disconnect the display Power up the motherboard Please be kept in mind that the time for powering up shouldn’t be as well lengthy It can be seen that the existing value is large The motherboard has a large current which suggests the motherboard is short-circuited Next, we require to get rid of the motherboard and find the damaged part for fixing Measure the diode value of PP_BATT_VCC line with a multimeter The diode value is 0 It can be validated that PP_BATT_VCC line is short-circuited PP_BATT_VCC line and PP_VDD_MAIN line of iPhone 12 are linked in series by an inductor So the short-circuited PP_BATT_VCC line might also create the PP_VDD_MAIN line to short circuit The old solution to fix the huge current trouble is via rosin discovering Via the melting of rosin, we can validate the malfunctioning component Though the solution is affordable and efficient, it has some imperfections The motherboard has to be covered with rosin while the rosin is tough to tidy up later Furthermore, we need to eliminate shielding covers on the motherboard for a complete evaluation There is no uncertainty that procedure difficulty will certainly be considerably boosted Today we will introduce an advanced and reliable means to look for short circuit on the motherboard with the aid of a Thermal Imager Camera The thermal imager finds the component of which temperature is greater than typical worth via infrared radiation The thermal imager can detect motherboard electrical leak within secs The defective parts will certainly be identified in a snap as soon as you place the motherboard under the video camera, greatly enhancing repair effectiveness While inspecting general motherboard working problems, the thermal imager can identify faulty get rid of high precision In addition, the thermal imager is a professional in spotting little electric leak, brief circuit and various other troubles with very easy and risk-free operation, substantially decreasing the error rate First off, we placed the motherboard on the functioning platform Attach the black probe of the direct power supply to the ground and link the red probe to PP_BATT_VCC line The temperature level on the leading left corner has increased up The defective part can be verified on the top left corner Open up the bitmap We can see that PP_BATT_VCC line is out the top left edge Because PP_BATT_VCC line and PP_VDD_MAIN line are connected in series by an inductor, we can evaluate that PP_VDD_MAIN line is short-circuited Through inductors of PP_BATT_VCC line, click an additional side of the inductors The opposite side is connected to PP_VDD_MAIN line We can once more figure out the variety of defective part It can be seen on the bitmap that the PP_VDD_MAIN line gets on the reasoning board Following, we separate the motherboard Put the motherboard on the 170 ° C Heating Platform to warmth Get rid of the motherboard After the logic board has actually cooled down, power up the logic board Connect the black probe to the ground and connect the red probe to PP_VDD_MAIN line With the thermal image, we can currently verify the damaged component The capacitor is flawed with charring Eliminate the capacitor Clean the bonding pad with PCB Cleanser 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 actually been eliminated Then we recombine the motherboard Assemble the phone to evaluate The phone switches on normally Wi-fi and baseband operate well IMEI number can be seen The fault has actually been removed You can acquire the Thermal Imager Camera on REWA shop Please do not think twice to contact our account supervisors or customer care group for more information Thanks for viewing
