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Repair information and guides for the iPhone 6S Plus that was released on September 25, 2015. Model A1687, A1634

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Water damaged, won't turn, I had it charged

my phone dropped into water, it won't turn on. I opened the iphone 6s plus took off the shields, and plugged it in. connects to itunes in dfu mode. I then cleaned it throughly. afterwards, i put on new battery and lcd screen but it won't turn on. The Cpu seems to overheat alot. I checked the logic board with the naked eye and couldn't spot any problems. Is the problem with the fpc connector or the pm ic. the charging port works fine due to it begin recognized in itunes or 3utools. Also how can i use the multimeter to determine the problem or diagnotic the logic board in full and what should i use, continuity, resistance, dc, ac or anything else.

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has any of the indicator stickers turned red

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When dealing with a “dead” phone, you have to start at the beginning and check PP_BATT_VCC, PP_VCC_MAIN and PP5V0_USB. I would start by checking to see if those rails are shorted to ground. If one of these rails is shorted to ground, then you will need to identify what is causing the short. It could be a bad decoupling capacitor, conductive debris or defective IC that is directly supplied by those rails.

If they are not shorted, then you can connect, preferably, a known-good battery (or a current limited DC power supply with the appropriate connector adapter) to see what voltage you measure. If the voltage is low or lower than the battery voltage (which you measured before plugging it in ;>), then there could be a short circuit on secondary subsystem that is causing the battery or DCPS to be current-limited.

Then you move onto the PMIC and check the voltage rails it generates. Report back and I can give you more guidance.

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fahad ali will be eternally grateful.
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