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iPhone 6S - Volume down button

Bought the phone that apparently had a problem with the volume buttons. Opened it and the water indicator from the logic board was red, although the one near the sim tray was white, so I assume partial water damage. I took it apart and washed the entire logic board with 99% isopropyl and installed a new upper component flex cable to replace the buttons. the problem is that after all, only the volume down button does not work, just like with the old flex cable, I don't understand why. The volume down button works randomly for some time and then I have to keep clicking it for a few seconds until it works and then stops working after a few minutes. Have also tried switching the button covers and don't know what else to do to fix this. Would appreciate any help.

Update (12/15/2017)

Here's a picture of the connector itself, looks pretty good to me, no signs of corrosion that I can see.

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Puan 1

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I tried cleaning it again with 99% isopropyl and a brush and it worked very good after I reassemble everything and then stopped working..

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Here is a picture of the FPC connector to the volume down (FL4712, DZ4712, to C4712) and Schematic

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Puan 3

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Can you please send a picture of the logic board showing where exactly that component is? Thanks

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I added it to the pictures above :)

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Try cleaning the connector better and seeing if any components are missing. I think there is an inductor between the connector and the CPU so if cleaning more won't fix it ask me and i can show you where the component is.

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Puan 2

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I've tried cleaning it a few more times but it doesn't work. What else should I do? Thanks

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@gigabit87898 and RDC4, I didn't mean to step on the answer but had ZXW open for another person and added the pics below for you ...Hope it helps

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Nothing attached @gigabit87898

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look at the answer above

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Hi if someone can help

Plus and minus volume buttons not working. Silence switched and power button is working. Changed the ribbon cable but same symptoms. iPhone 6s 32gb?

Thanks

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I have cleaned everything I could and replaced the cable with a new one and the problem returned after some time. Don't know what else to do. The weird thing is that is just the volume down button that is not working.

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actually my mother bord is broken and volume buttons not working can you please send my the main print of volume buttons

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