Chosen Solution
Hi The iPhone charged at first, then one time after it draining completely I turned it on to find that it wouldn’t charge, when plugged in the % would drop. To add to this when shut down it would now stay hot and drain. I replaced the battery, dock connector and still no charging. Was going to get it sent off for a new power IC until I decided to open the motherboard up. Under the metal casing I found a lot of green gunk/corrosion which I assume was from water damage. This was located at the bottom near the antenna and blue capacitor but inside the charge circuits. I cleaned this out with a toothbrush a alcohol, first it didn’t help, but after leaving it soaked in alcohol for a bit and drying it it began to charge again!! It now works, but charges incredibly slowly and is quite hot. Is there a way that I can make sure the corrosion doesn’t come back and a way to hopefully speed up charging? It’s all hardware related. Many thanks.
Leo, looks like you have at least one broken component. L9 looks cracked. That is 1.5UH-2A-126MOHM VLS252012-SM coil. The other bigger issues might be U11_RF which is a RF power regulator MAX8839L and is directly related to the charging circuit. You could check the components with a multimeter and see what you get. It also still looks like a bit of corrosion. you do want to remove those EMI shields and clean everything properly and double check that area for more missing, broken components. Hope this helps, good luck.
heat = a short. Phone is not going to work well with a short, and excess heat will damage other components. You have to find and fix the short. Which component is the source of the short? The one that is the hottest. One way to find it is to use your lips which are really sensitive. Another way is to spray that part of the board with a freeze spray then see which component melts first. In any event, you know you had/have corrosion. Any component that is/was discolored or burned could be the culprit. A component can look visually just fine, but not function electrically as designed. Just like a loose lightbulb may light up for a few minutes in the right position, your phone temporarily was able to charge—you still need to screw that lightbulb in if you wanted to actually be able to use the device. If you find the likely source of the short, you can remove that component and see if the heat goes away. Replace it with a good one. Of course this, like the battery connector repair, requires specialized skill in microsoldering. You really wouldn’t be able to achieve a successful result (in my opinion) without experience, a stereomicroscope, a 0.2mm variable temp soldering station, and the low melt solder that you said you didn’t have ;) But, everyone has to start somewhere—give it a try and let us know how it works out! jessa
