iPhone 7 audio ic repair, with a twist!

Recently we had an iPhone 7 in from a regular that had the classic audio IC symptoms of C12 pad damage. The phone would take a few minutes to boot, hung on the apple logo with home button vibrations, once booted it was very slow and we could not record voice memos. We also couldn’t hear on the phone and loud speaker was greyed out.

So we went about repairing the C12 pad damage as usual on any iphone 7 audio IC repair. When we lifted the IC up off the board there was no damage to any of the usual traces, all pads where firmly in place. We ran jumpers as normal anyway, reballed the IC and refitted it to the board. Unfortunately there was no change! We then removed the ic and replaced it incase the chip itself was faulty. This made no change either! We then checked the components around the audio IC and found the the resistor R1103 off of the C12 pad was faulty and needed to be replaced. We have done hundreds of audio ic repairs, and this was the first time we have seen it caused by this faulty resistor.

We tested the phone which was all working again, we then cleaned the board and reassembled the device. It was returned to our customer who was happy to have it back.

We have never seen this resistor cause audio IC problems before, but now that we have we will always check this before removing the IC, we don’t know if the IC was faulty too or if it was just this resistor all along but we know for sure that next time we see this faulty resistor we will find out.

The reason we love board level repair is because you can always learn something new, like when a classic repair turns into something a bit different for a change it makes your mind work a little bit harder.

 

iPhone SE restarting and battery jumps

This week we received an iphone SE that had battery issues after a screen replacement. The battery percentage would jump up and down and the phone would randomly turn off. This was a common issue on the 5s series, usually caused by components by the battery connector being knocked off or damaged during repair.

This iphone SE was exactly the same, when the repairer had disconnected the battery they had knocked FL2400 off of the board, causing the battery issues. This filter is in a very tight space and is very hard to get to. The way we go about this is by applying solder to the pads using our micro tweezers, then putting the new filter in position and using heat with a very low airflow to reattach the filter back into its position. After the repair we tested the phone to make sure the battery would behave normally, staying at a steady percentage, charging normally and not turning itself off. The issue was resolved and we had yet another happy customer!

 

iPhone 6 tristar 1v8 line repair

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.

 

iPhone 7 plus no power repair of trinity IC

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!

iPhone 6 Plus Touch Disease

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.