The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

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Capacitors around PMIC shorted

Hi there, I have a water damaged iPhone 5s for repair. The phone is totally dead. After opened it, I found corrosions around U3 display chip. I removed the U3 chip, and found the pads under the chip are quite bad. I cleaned them, then soldered a new U3 chip. Tested the phone, the phone turned on perfectly fine, tested all the features of the phone, all working perfectly. After about 10 minutes, the phone suddenly turned off without any warning. Then again no signs of life.

I had to again open the phone, this time I found almost every capacitors around PMIC are shorted. These capacitors are in different lines, all shorted! It made me feel that the PMIC is probably bad. I removed the PMIC, cleaned the phone. The short is still there. Almost every caps around PMIC are shorted.

Could it be the CPU? The components around the CPU look clean. Any help would be highly appreciated.

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Deck the Halls
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Did you properly clean the logic board before you started repairing it? If you don't do that, there would potentially still be water under the IC's and once you powered it up, it would have caused more damage.

Now regarding the PMIC did you test the output lines for shorts when the PMIC was removed? That many shorts is usually a PMIC problem but in this case you replaced it. You need to look at this one line at a time. Look at PP_CPU, PP_GPU etc. Take note of all the shorted lines. Let me know what you find.

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Hi Minho, thanks for your quick answer. Yes I always fully clean the motherboard for any water damaged phones before turning it on.

Shorted lines are: PP_SDRAM (both input and output lines are shorted), VCC_main. PP_CPU and PP_GPU lines are fine, no shorts found.

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Focus on PP_VCC_MAIN for now. Something is pulling it down. Check any cpas that were attacked by corrosion to start (i.e. C5202_RF) and then work your way through the outputs of the PMIC to see if one of those is shorted.

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