Chosen Solution
Hi! My phone got waterdamaged so i dried it out and got a new battery from IFixit. Replaced the battery and it would not start. so i took out the logic board and soaked it in Isopropanol for about 30-40 minutes while cleaning out all the ribbon cables etc, Note: No noticable corrosion. Checked the IFixit battery with a multimeter and got the reading. 3.83V dc, keep in mind my multimeter is cheap. After drying out the logic board again i assembled the phone and tried to start it. No response so i plugged the lightning cable into the computer to see if the phone would be reconized. No success. so i left it for about 6 hours and took out the battery again to messure it again. this time it was messured to 3.55V dc. so having it plugged in drained the battery, so i plugged it to the wall, and the battery did get charge.. atleast was heating up after about an hour. with no success i took the logic board out again to soak it another time in Isopropanol. same process as last time and with the same result. Any suggestions to what i can do or what could be wong? PS: did try the mute button to see if i could get a response from the phone. also tried Home+Sleep/awake button but nothing seems to have any effect on the phone at all. so to me it seems like its not starting up and not the screen that is just not turning on.
check the capacitor beside the wifi chip with the multimeter in beep mode put a probe on ground and touch both sides of the capacitor if both sides beep then you have a short on the board
FIrst of all, iso alcohol ONLY helps absorb moisture, it will not resolve issues resulting from corrosion, etc caused by chemicals/minerals in the liquid the phone was in. You most likely have a short from corrosion under/around a component. The first step after verifying the phone is not starting and not recognized by itunes is to clean the logic board in an ultrasonic cleaner using a mix of distilled water and solvent like “Branson EC”. The shields should be removed from the board to ensure the cleaner can properly reach all components with the solution. Once the cycle is done, you can use compressed air to remove excess moisture and then soak the board in alcohol to remove all traces of water/solution. Replace the shields and retest. If there are corroded or shorted components, you’ll never get the phone to function properly or pass any tests and will only get frustrated trying. I know its not the easiest step, but it will ensure you aren’t pointlessly replacing parts in an attempt to get it going
circled blue. looks damaged at 1 side so that could be the short cap if both sides are short to ground
