Big current is among the usual problems of phone repair service Since there are great deals of associated parts, the harmed element is tough to spot An infrared thermal electronic camera is usually used to promptly spot the faulty part Today we will repair an iPhone with the most up to date LINCSEEK Infrared Thermal Cam LINCSEEK Infrared Thermal Cam is made use of to examine the temperature of elements on the phone to see if the PCB is short-circuited The thermal imager can rapidly find faulty components with basic operation In enhancement, it can quickly identify little current leak of 5 mA and short-circuited capacitors Vision and thermal modes allow it to identify defective parts without a microscopic lense Following, we use the thermal imager to repair an apple iphone 11 Pro Max with huge current The phone is unable too up Lift the display Detach the battery Attach the motherboard with a power wire The ammeter shows an existing of 1 A The phone has big present while the boot-up hasn’t been triggered Consequently, it can be evaluated that the mistake gets on the primary power supply circuit and related parts Following, remove the motherboard Action the diode worth of the battery port with the multimeter The diode worth is 314, which is typical After that we placed the motherboard on the thermal imager Connect the motherboard with a power wire Locations around the NAND are getting hot seriously Considering that NAND is out the primary power supply circuit, we require to separate the motherboard for further testing Remove the logic board with Heating Platform at 170 ° C Due to the fact that the phone has been heavily dropped previously, we can see that there are several missing pads on the bonding pads Next, attach the reasoning board with a power wire The logic board does not have large present The fault is probably on the signal board Power up the signal board individually with the probes of the multimeter Big present shows up on the signal board It can be confirmed since the mistake gets on the signal board To specifically find the mistake, placed the signal board on the thermal imager and supply power to it It can be seen that the temperature level of areas around U5000 gets to 80 ° C quickly Measure the capacitors around U5000 with the multimeter and there is a short circuit Furthermore, a capacitor was discovered to be shed out throughout measurement Following, we eliminate the capacitor Apply some Paste Change to the capacitor Remove the capacitor with Hot Air Gun at 380 ° C After that replace it with a new one Procedure with the multimeter again The diode value go back to a normal value of 446 Because there are still missing pads, after that we repair those missing out on pads Tidy tin on the bonding pads of the signal board with Soldering Iron and Solder Wick Clean tin on the bonding pads of the logic board with the same technique, and then remove the thermal paste Maintain cleaning the bonding pads with PCB Cleaner Open REFOX Bitmap to establish the missing out on pads for repair work Considering that some missing out on pads are grounded, there is no need to repair them Scratch to reveal circuits of other missing out on pads with a Sculpture Blade Apply tin to the bonding pads with a Soldering Iron Put the Soldering Lugs in position Solder with a Welding Torch at 380 ° C Apply some Solder Mask to the bonding pads that have been repaired After that solidify with a UV Lamp for 5 minutes After strengthening, remove excess solder mask with a Sculpture Knife to reveal the pads Next off, we reball the signal board Apply a layer of low-temperature Solder Paste uniformly Put the signal board on the 170 ° C Heating Platform to heat After the solder rounds are developed and the motherboard cools down, apply some Paste Flux to the bonding pads Straighten the reasoning board Keep home heating with the Heating Platform After recombination and the motherboard cools, attach the motherboard with a Power Wire The motherboard no more has a huge current Then cause the boot-up with Tweezers The boot current has returned to regular Install the motherboard The phone activates usually The baseband is additionally regular Please do not hesitate to leave a talk about repair work topics that you are interested in Thanks for viewing
