We received an iphone 7 plus recently for no power. Our customer told us that when they connected a new battery the motherboard would smoke.
When we received the device we plugged it into our power supply and just as the client said we saw smoke coming from M2800 the trinity IC, often called the touch ic but it is actually just a cluster of coils for several different lines built into one IC. we also saw a 5 amp short on the main power line.
First off we removed the trinity IC, which is an ic that contains several coils, to find out which line was shorted. We found the short on the speaker amp line, so then we knew where to look! We flipped the board over to look around the speaker amp circuits and found a burnt out capacitor in the C3404 position.
We removed this capacitor and the short was resolved. Next we replaced the trinity IC with a new one and plugged the phone into our power supply. The short was gone so we prompted the phone to boot, the phone appeared to turn on and function normally so we unplugged it and fitted a new capacitor. We then cleaned the logic board and reassembled the device and charged it up for full testing. The device seemed to function perfectly so we returned to the customer who was very happy to have their device back fully working.
We have seen similar issues with shorts causing the trinity IC to fail but this was a first on this particular line, this is why we love board level repairs, each one is slightly different and you have to think on your toes!
The most common issue seen on the iPhone 6 Plus and sometimes the iPhone 6 is touch disease. This fault is caused by flexion of the logic board which breaks connections under the touch IC.
The most common symptoms of this fault are:
- Unresponsive touch screen.
- Grey bars at the top of the screen.
- Touch screen freezing.
- Having to bend the phone for the touch screen to work.
This fault is caused by poor design by apple and flexion of the motherboard over time, it can also be caused by bad drops and bending of the phones rear housing. On the iPhone 6 Plus the housing of the phone is weak and can bend very easily, every movement in the housing passes through to the motherboard and over time traces within the motherboard break. In this instance the trace leading to the M1 pad under the touch ic in the phone breaks and causes touch disease, when the phone is bent in a certain way the connection is restored and this is why the issue can be intermittent.
At microsoldering repairs we are able to remove the touch ic, run a jumper to repair the broken trace and restore the connection to the M1 pad, then reball the ic and re attach it resolving the issue and restoring touch functionality.
This repair is future proof as the jumper put in place is stronger and less vulnerable than the original trace, meaning further flexion of the motherboard will not cause the connection to break again.
We repair a lot of this fault, along with other common issues such as audio ic on the iPhone 7, Tristar replacements for charging issues and baseband repairs for no service or searching faults.
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 recently received an iphone 7 that would not turn on.
We plugged it in to charge and got no response from the phone. We then cleaned out the charging port which made no difference.
We then cracked it open and connected up to our DC power supply, it turned on and seemed to work perfectly other than charging. We tested with a new battery and charging port which made no difference. We then tested what voltage we get through the battery connector when charging and we got a very low reading of 0.45v.
In the iphone 7 the common causes for not charging are the tristar (charging ic) and tigris (USB ic). Unfortunately on the iphone 7 when one of these IC’s goes bad it usually damages the other, this means when replacing one we will replace both for peace of mind, otherwise you may find your device suffering from the same fault in the near future.
We believe that if your going to do a job you should do it right, this is why we do repairs our own tried and tested way and if we can find a way to improve a repair, we will do so.
So we disassembled this iphone 7 and tested the charging circuit. Of Course we found low voltages on the 1v8 and 3v lines coming out of the tristar. We replaced both IC’s and this brought the voltages up to where they should be. We then cleaned the board and reassembled for testing. The phone now pulls around 1A through the charger which is perfect and is charging nicely. We are also getting 3.72v through the battery connector which is a very good reading.
The phone was then returned to the customer who was very happy to get their device back and working within a day.
If your having issues with an iphone not turning on or charging please feel free to get in touch.
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.
This week we have had an ipad Air 1 arrive that has had a previous repair attempt for no power.
For all repairers any previous repair attempts are usually much more difficult to solve as you never know what the previous repairer may have done to the device. Whether they have overheated components causing bridging under IC’s or damaging parts of the phone, generally these repairs can end in several faults needing rectifying, this particular job included.
So to start this job off we plugged the ipad into charge through our ammeter and saw that it would not pull any current at all.
Upon opening the device we could clearly see that the charging port had been replaced, there were marks on the battery which shows the board had been removed and hopefully the battery tested. The main EMI shield had also been removed and not refitted, showing marks around the tristar (charging ic) this had clearly been replaced, although the job did look good with no major damage to surrounding components. We did however notice that the IC fitted was model 1610A3 where the Air 1 should be 1610A1. From experience we know that the Air 1 in particular is very picky as to which tristar ic it works with, in a lot of idevices these are changeable but on the Air 1 we never swap for another version as we know this can cause issues.
We next removed the board and connected up to our DC power supply. We then pressed the power button and the ipad booted up and seemed to work fine other than charging. We then knew that we were definitely up against a charging issue rather than a no power issue.
So from this we decided to first go to replacing the tristar ic with the correct version. We did this and checked voltages but unfortunately still had no power on the charging circuit. Next we turned to testing the charging port which looked terrible. After removing the previously replaced port we found several pads missing. After checking we found that 2 where for speaker lines and the others where ground so would not be a huge issue.
We cleaned up the pads and fitted a new port, we then cleaned and tested the ipad. After replacement the battery appears to charge perfectly but we did have problems with sound so we then ran jumpers from the charging port to the correct test points for the missing speaker line pads restoring the sound.
After this we covered the exposed solder pads and refitted the board into the ipad and charged it up fully to test the device. After passing our tests it was resealed and returned to the customer who was delighted to have their device back and working after having a bad experience with another 3rd party high street repair shop.
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.
There is a very common fault in the iPhone 7 family called audio disease or audio ic failure. This issue usually starts with a phone taking a very long time to boot (sometimes 5 minutes) and intermittent problems with hearing people and people hearing you on the phone.
As the fault develops further the speaker phone option will be greyed out, voice memos won’t work and sometimes the phone will get stuck on the apple logo.
These are all very common symptoms and are a design flaw on this model. The fault develops due to flexion of the mother board near the sim reader, which just like touch disease on the iPhone 6 Plus is caused by tracks being damaged. The fault often develops after the phone is dropped of bent and can often arise after your screen breaks.
All these issues can all be resolved by removing the audio ic, repairing the broken tracks and rebuilding the missing padsZ there is usually one main line that breaks which is the c12 pad.
When we repair audio issues on the iPhone 7 we will run jumper cables to 4 different pads making sure that the issue will not return again in the future and strengthening the connection.
The jumper cables that are installed are much stronger than the original board traces making this a long term fix. On the rare occasion that the IC itself is faulty we can also replace this to guarantee a true fix.
At micro soldering repairs we take pride in our work and carry out this repair daily. Are you experiencing any of these problems? Or do you run a repair shop and looking for a company to outsource your microsoldering repairs to? Why not get in touch today for more information on our services and our B2B rates?