Huge present is just one of the usual issues of phone repair service Since there are lots of relevant elements, the damaged component is tough to spot An infrared thermal electronic camera is typically utilized to quickly find the defective component Today we will certainly repair an iPhone with the most up to date LINCSEEK Infrared Thermal Cam LINCSEEK Infrared Thermal Camera is made use of to check the temperature of elements on the phone to see if the PCB is short-circuited The thermal imager can swiftly find damaged components with simple operation In enhancement, it can swiftly discover tiny current leak of 5 mA and short-circuited capacitors Vision and also thermal settings allow it to identify defective parts without a microscopic lense Next, we utilize the thermal imager to deal with an apple iphone 11 Pro Max with large existing The phone is not able too up Raise the display Disconnect the battery Connect the motherboard with a power line The ammeter reveals a current of 1 A The phone has huge existing while the boot-up hasn’t been triggered Consequently, it can be evaluated that the mistake gets on the major power supply circuit as well as associated parts Next, eliminate the motherboard Action the diode worth of the battery port with the multimeter The diode worth is 314, which is regular Then we placed the motherboard on the thermal imager Connect the motherboard with a power wire Locations around the NAND are getting warm seriously Because NAND is not on the main power supply circuit, we require to separate the motherboard for more testing Remove the logic board with Home heating System at 170 ° C Because the phone has been greatly gone down before, we can see that there are several missing pads on the bonding pads Following, connect the reasoning board with a power line The logic board does not have huge current The fault is probably on the signal board Power up the signal board independently with the probes of the multimeter Big present shows up on the signal board It can be verified now that the fault is on the signal board To exactly identify the fault, placed the signal board on the thermal imager as well as supply power to it It can be seen that the temperature of locations around U5000 gets to 80 ° C swiftly Gauge the capacitors around U5000 with the multimeter and there is a short circuit Additionally, a capacitor was located to be stressed out throughout measurement Next, we eliminate the capacitor Apply some Paste Flux to the capacitor Eliminate the capacitor with Hot Air Weapon at 380 ° C After that replace it with a new one Measure with the multimeter again The diode worth go back to a normal value of 446 Due to the fact that there are still missing out on pads, after that we repair those missing pads Clean tin on the bonding pads of the signal board with Welding torch and also Solder Wick Clean tin on the bonding pads of the logic board with the exact same technique, and also after that eliminate the thermal paste Keep cleaning up the bonding pads with PCB Cleaner Open REFOX Bitmap to establish the missing out on pads for repair service Since some missing out on pads are based, there is no requirement to fix them Scuff to show circuits of various other missing out on pads with a Sculpture Blade Apply tin to the bonding pads with a Blowpipe Placed the Soldering Lugs in placement Solder with a Soldering Iron at 380 ° C Use some Solder Mask to the bonding pads that have actually been fixed After that strengthen with a UV Light for 5 minutes After solidifying, eliminate excess solder mask with a Sculpture Blade to show the pads Next, we reball the signal board Apply a layer of low-temperature Solder Paste evenly Put the signal board on the 170 ° C Heating Platform to warmth After the solder rounds are developed and also the motherboard cools down, use some Paste Change to the bonding pads Line up the logic board Keep heating with the Home heating Platform After recombination as well as the motherboard cools, link the motherboard with a Power Cord The motherboard no more has a huge existing Then set off the boot-up with Tweezers The boot current has actually returned to typical Install the motherboard The phone activates normally The baseband is also regular Please really feel free to leave a remark on repair service subjects that you are interested in Thanks for watching
