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Phone was dropped and LCD panel was shattered. Had it fixed locally because they had the parts in stock. After the repair found out the WiFi and Bluetooth had little to no signal compared to what it should be. I had the local shop test out both cables, one for WiFi/Bluetooth and the other for 4g or 3g(can't remember). Both cables tested fine in another device. My next step was to replace the midframe figuring that might be it, plus, its the cheapest part in the list of parts to test. Unfortunately, in my case it is not the midframe. Next thing to test is the smaller board at the bottom of the phone which has the USB connector on it.
As far as replacing the midframe goes, it went very smooth! This is a very simple and straight forward repair! 4 screws on bottom and 5 or 6, something like that, and both peices come out that are needed to be removed.
Dont forget to remove your battery, MicroSD card, and SIM Card. Other than that straight forward!
Frustration often leads, indirectly, to broken things, such as cracked smarphones.
It took roughly 30 minutes to fix. The S4 is easy to take apart aside from separating adhesives. I spent some time prying the glass off which caused little fragments to spray everywhere. This was completely unnecessary. Eventually I got under the display itself and it came off easily. Installing the new display is a snap.
I was hesitant since this repair supposedly involves the use of a heat gun, but there's a good youtube video for this exact repair (entitled "Galaxy S4 Display Replacement | Removal from Midframe") which explains that the screen shouldn't get hotter than 100F. I used an IR temperature gun to make sure I just barely warmed the phone. The verbal description of the repair process was a bit cryptic but did include important details, such as going under the foil behind the display. These phones are made of many layers and it's important to know which layers are being split apart. The layers are not all the same size or shape, either, so pay attention to the phone's design.