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Central Indiana Iphone Rehab
1313 Elk Lane
Elwood, Indiana 46036
45 minutes North of Indianapolis Indiana

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Soldering is a process in which two or more metal items are joined together by melting and then flowing a filler metal into the joint—the filler metal having a relatively low melting point. ... Only the solder melts, not the parts that are being soldered.
There are components so small (as shown in the photo above), that a microscope is needed to work with them. The size and location sometimes makes it impossible to get to the solder with a standard soldering iron to melt the solder to repair or replace the part so specialized tools and methods are needed to accomplish this.

The melting point of Solder varies on the types of solder that was used and the location ot the solder. As you can see in the photo above, the backlight filter and capacitor have exposed solder and can sometimes by melted using a Micro Pencil or Micro hot tweezers to remove or replace them with temperatures from 360 F to 430 F on average. But this cannot be done on the IC chips where the solder is under the IC chips and cannot be reached with an iron.

In this case, hot air from a rework station is used, masking off the areas of the logic board with Kapton tape and heat shields leaving only the area being worked on exposed as seen in the picture below. Temperatures need to be raised to get the solder under the IC to the melting point which is called "Reflow" (Reflowing the solder) using temperatures around 715 F.

Once the IC chip is removed, it is either replaced with a new IC chip in cases where the chip may be bad after cleaning the solder from the pads on the logic board the little solder balls sit on (Called "Wicking" the pads). These pads are connected to the circuit that runs on or within the logic board. In some cases, these "Pads" are either damaged or disconnected from the circuit requiring "Jumpers" to be soldered in their place to complete the circuit between the chip and that particular circuits destination.

Other times, there is nothing wrong with the IC chip at all, the solder balls are simply not connecting the IC chip to the logic board due to bent phones, drops, etc... and only require a "Reflow" or "Reball" (Taking off the IC chip and using a template to apply new solder to the IC chip before putting it back on).

Touch Disease Does Not effect the 6S and 6S Plus in the same way, The IC Chip is part of the LCD
Flex Cable. Also, The New IOS 11 Will make some "s" series replacement screens appear to have Touch Disease and it's not... READ THIS FIRST

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Charging IC Issues

This can be a pretty tricky one to diagnose at times. When your phone is not charging, charging slowly or will not power on, most people would think to change their battery or charging port. However, there are 2 IC Chips on the logic board that can be responsible for your troubles.
Of course you would want to pull out the trusted multimeter and test your battery after googling how to test your battery or even test the charging connection your battery plugs into from the charging port. But what happens when you replace the battery or lightning port believing it to be bad and still have issues?
Next thing to do is to check voltages aroung Tristar or Tigris. Using generic chargers (Non OEM) can damage 1 or both of these chips and the only way to get your phone back up and working again is to replace the faulty component.

Backlight Coil, Diode, IC and Filter Issues

Here is another common issue I see pretty often anymore due to DIY screen replacements. The story goes something like this, "I just replaced my screen that was cracked but working perfectly. I put on a new screen and now it doesn't have an image but I can still get messages and phone calls. I can hear it working and even responds to touch! But no picture on the screen".

There are only a couple things that can cause this.

1. "Long screw damage"... When you remove the screen from the housing, there is a shield covering the Flex connector cables with 4 to 5 screws holding it place. You "MUST" put these screws back in the same holes they came out of! They may look similar, but each one is a different size and by putting a screw that is just a bit longer into it, you bottom out against the Logic board where several microscopic traces are located. Tearing and severing them thus preventing them from completing their circuit.

2. Shorting out the backlight circuit by removing or replacing a screen while it is still powered on. You must power off the phone first, then remove the shield from the battery connector and disconnecting that too.

Each Iphone model has its own symptom and repair. Some models only have 1 backlight circuit and the entire screen goes out, only being able to see it's a backlight issue by holding a flashlight up to the screen and still see a faint image. Others have 2 backlight circuits and you can have a partial (or "Half" backlight shorted out as seen in the following pictures.
Phone repair can be as simple as exchanging a bad Filter (or "Fuse") while others have fried the entire circuit needing to replace the Coil, Diode, Backlight driver IC Chip, Capacitors and Fuse (Filter).

Water Damage

In my personal opinion, one of the most dreaded repairs! Water typically doesn't do the damage to the phone as most would believe. If properly cleaned and dried right away, little or no corrosion damage will happen. The problem arises when the phone gets power. When you attempt to power on your device or charge it and it is still wet inside....well, circuits get shorted "Fried" and damage occures. And without properly cleaning and drying the phone, corrosion occures...Both causing extreme damage in most cases.

FIRST, Never, ever, ever just plop your phone in a bag of rice and think you are helping your phone. It does absolutely nothing but give you a false belief that you are doing something. The water is now inside your phone and that is where you need to get to to get it properly cleaned.

SECOND, Do not be tempted to turn it on or charge it to see if it is okay. In some cases, it is...but in most, it's not. Open the phone, disconnect the battery. Clean and dry everything you can get access to. If possible, remove the Logic board and give it an alcohol bath with at LEAST 95% Iso Alcohol and let airdry overnight to a few days.

A Water Damaged Logic board will need proper decontamination / cleaning in an Ultrasonic cleaner with the proper cleaning solution to remove most of the corrosion. It will require removing the several soldered on shields to get to about 80% of the components for cleaning and testing.

Water damaged phones can be properly cleaned and repaired for Data recovery in some cases. The problem is that even with proper cleaning and repair, other issues can eventually arise due to corrosion under components so the phone may not be permanently fixed, but possible to repair just enough for Data recovery and then use the phone until some other problem shows up.
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For future water damage on your phones, do not use rice. Get the phone apart ASAP, disconnect battery, keep track of where every screw goes, and soak the board in 99% alcohol for about 10 minutes, swirling and gently scrubbing with a soft toothbrush, cleaning the housing, charging port and everything you can to displace the water and get it to a repair shop right away.

Stay tuned for more info on this page

ADDRESS: Central Indiana Iphone Rehab, 1313 Elk Lane, Elwood, Indiana 46036

PHONE: (765) 480-2581 (833) 200-0909

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