We had an iphone 7 plus in recently after our customer had cleaned the phone after water damage and the phone would still not turn on. The water damage was minor and had only affected the top of the board.
Upon inspection we had a 5 amp short on VDD main. We checked over the board and found that capacitors C2609-2611, where all very corroded and needed replacing. We removed these components and tested again, unfortunately the short was still present. We then removed the CPU shield to inspect this area. The shield had not been removed so cleaning of the board could not have been done properly, after removing the shield we found a lot of corrosion above the CPU covering capacitors and resistors. We cleaned the board and saw that there were still several components that were visibly corroded, most seemed minor and we did not think these were a problem. We probed around in diode mode and found one nasty looking capacitor C3325 on the speaker amp line that was short. We removed this capacitor which cleared the short on this line and on the VDD line too, these lines where linked through U3301
We plugged the phone into our power supply and it booted up normally, we tested the basic functions and all seemed fine. We then cleaned the board and reassembled the device and returned it back to our customer who was very happy to return the device to its owner fully working.
We love working on water damaged devices as the owners are always so happy to get their phone and more importantly their data back!
If you have a water damaged device with important photos on please feel free to get in touch. We love a challenge!
Last month we received an iphone 7 in the post from another shop after they had cleaned the motherboard for water damage. The board did not look very corroded, just a few spots but nothing major.
We plugged it into our power supply which showed us that there was a short on the VCC main power line. We removed the board and checked for heat which seemed to come from the bottom of the board on the back near tristar. We looked and could see one cap C3710 near the tristar IC that was discoloured, we removed this and the short cleared. Next we assembled the phone and tested that it would power up, it did.
We then tested basic functions and found that the home button and taptics where not working. There was a lot of corrosion around the home button FPC so tested it with a new screen, which brought back the button functionality but not the touch ID. i then checked the button properly under the microscope and found that the fpc was very corroded. 2 pins had separated from their pads and where not connecting to the flex. We resoldered these connection and tried again on the new screen which resolved the issue.
We still had no taptics so searched the board for a reason, we found corrosion around U3502 the arc driver that is connected to the taptic engine so we removed it, we cleaned the pads, reballed the IC and refitted it. The taptics kicked back in and we had another fully working phone. This repair did take a little longer than most due to there being various faults but we still had it back up and running within 48 hours, if it was just a data recovery job then we could have turned it around a lot faster but as the client wanted their phone back working so we did the extra work to suit their needs.
Just another service offered by the team at microsoldering repairs.
We recently received an iphone 6 that was not charging. A new charging port and battery had already been fitted by another shop and not solved the issue.
We connected new ones and still the phone would not charge. We disassembled the phone and removed the shield over tristar expecting it to be a standard tristar failure. Everything seemed normal, to start with, no previous repair attempts, testing the lines showed 3v3 line power as normal but nothing on the 1v8 line. There were no shorts around the IC so we went ahead and removed the tristar charging ic.
Once removed we could clearly see why there was no power on the 1v8 line. The trace to pad F3 had totally burnt out and no longer existed. This was not a problem for us. We simply made a micro jumper from C1739 to the F3 pad to remake the connection. We then fitted a new tristar charging ic and tested the device, we now had power on the 1v8 line and had restored charging capabilities to the phone. We tested voltage coming into the battery connector and had 3.7V which is perfect.
We reassembled the device and sent it on its way back to its owner who was very happy with the repair. We had restored full functionality to the phone that they had been told could not be fixed elsewhere.
If you have a charging issue on your iphone or have been told somewhere else that your device is not fixable, please feel free to get in touch, we would be happy to help.
A couple of weeks ago we received an iphone 6s in for no power. The phone was clean and did not appear to have been opened before. We plugged it into our charger through the ammeter and the phone pulled the expected current.
We plugged it into the PC and it connected to itunes in DFU mode. We spoke to the client who did not have any important data on the device so we were instructed to attempt a restore. The restore through up error 9 which is known to be a problem with the nand (the memory chip) which put simply is like the hard drive of the phone.
We disassembled the device and tested the power lines to the nand which where all present. Next we checked power to the CPU which was fine as well. Next we decided that it must be a bad connection under the nand or a faulty chip so we went to remove the nand so that it could be reballed. We put the board onto our bottom heater and applied light heat to the top ot the nand so that we could scrape away the black underfill around it, after this we cranked up the heat and went to remove the nand. We applied flux and slid a thin tool underneath to pop it off.
We then cleaned the pads and remaining underfill from the nand areaand did the same on the nand itself. Next we put the nand into our nand programmer to test it, the programmer could read all of the chip data so we knew that the nand itself was ok. We reballed the chip and cleaned it and the logic board. Next we applied flux and refitted the nand into position.
After installation we cleaned the board up and fitted it back into the housing. We connected up to the PC, still in DFU mode and clicked restore. We waited, waited and waited some more until the restore went through without error and the phone came back up as normal!
We tested the phone as far as possible without icloud details and where happy that the repair was successful.
We reassembled the device and sent it back to the owner who was chuffed to have their phone back in full working order.
This week we received a phone from a customer that had brought it from another shop only 2 months ago fully working and within this time the wifi had stopped working.
The iphone 6 plus was in good condition. We tested the device to find that the wifi switch was greyed out and they were unable to actually switch on the wifi on the phone.
This is a common issue on iphones and is either caused by a faulty wifi IC or a bad connection underneath the IC.
Luckily the iphone 6 series wifi ic is changeable unlike newer models and does not require any reprogramming, which makes it a relatively easy job for us. We preheat the board to 160 degrees so that we are able to scrape away the underfill surrounding the chip. Once this is done we are able to apply heat to the chip to reflow the solder underneath. We then tested the device and saw that the wifi function had been restored but we did not stop here. We know that once this fault has developed, if not repaired properly it can come back after time. So we reheated and removed the chip. We then cleaned the pads on both the motherboard and the wifi IC, reballed the chip and then reflowed it back into place on the board. This restores the connections much better than simply reflowing the IC. this is a tried and tested method by ourselves and we have found it to last long term rather than it being a short term quick fix.
At Pratts pods and microsolderingrepairs.co.uk we take great pride in our work and always thrive to provide long lasting repairs rather than quick fixes and bodge jobs. We will never let a repair or device leave without us being 100% satisfied with its working condition. We have spent years developing our skills and techniques in microsoldering and are confident we can repair 90% of faults that may occur with your idevices.
We had a customer in this week with an iphone 6s that had gotten very hot and stopped working.
We connected to our ammeter and found that it was not charging at all. After this we opened it up and connected to our dc power supply, there was no amp draw even when we pressed the power button which is very unusual.
We then checked the power button which was working fine. There was also no short on the main power rail which can be a common cause for no power on the 6s. Next we removed the logic board and inspected the bottom of the back where we see most power issues on the 6s and we found that Q2300 had blown and C2330 next to it was burnt out.
We removed these components and replaced with a new power IC and a capacitor from a donor board which resolved the problem. We connected it back up to our power supply and the phone booted like normal, we then reassembled the device and checked that it would charge and work without getting hot and dying again. After testing we were happy with the outcome of the repair, The phone now charges and powers up and works perfectly.
The customer was delighted to get their phone back in working order.
If you have a phone that won’t turn on or charge please feel free to get in touch, we can repair 90% of power issues and are always happy to help.
There is a very common issue across many apple devices, from iphone 5s up to the 8 and ipad mini through to the ipad 6 2018 which is the dreaded not charging, fake charging or rapid battery drain issues.
These are all commonly caused by a faulty/damaged Tristar charging IC and in some models the Tigris USB IC. This IC in simple, regulates the voltage that is put into charging your battery. When this malfunctions it can cause many different issues, such as not charging at all, not charging a flat battery, not powering on at all, rapid battery drain and only charging when turned on/off to name a few.
This damage is most commonly caused by cheap cables being used and charging your phone in the car. Apples own cables can break pretty easily so people often go and find the cheapest possible replacement, which is never a good idea, cheap cables do not have a regulated output meaning the voltage into these IC’s is too high and damages them.
When this IC fails, most repairers will tell you that this cannot be repaired or that it will take several days to a week.. This is because they lack the knowledge and are unable to test these components and replace them themselves. We specialise in board level repairs and know the tristar circuit like the back of our hands. If you’re having problems charging your phone or getting it to turn on please feel free to get in touch. We are confident we can get your device back up and running no matter what the issue is.