Speaker voltage - Xiaomi Redmi 4X Questions & Answers

Does someone knows the voltage that should comes from the main speaker output?
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My speaker suddenly stopped working (Using PE Plus 10), bootloader flash MIUI didn't work. Bought a replacement speaker that also didn't work.

Just Replace your Micro USB Charging Port Dock Connector Microphone Board Flex
https://www.ebay.com/itm/For-Xiaomi-Redmi-4X-Micro-USB-Charging-Port-Dock-Connector-Microphone-Board-Flex-/401556336011

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Possible to use a mic input while recording?

I've got a zoom H4n which is great for recording audio. It puts out it's signal as a 3.5mm style cable.
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Is it possible to plug this into the SGS using it's headphones output? I think you can get 4 pin ring cables or something similar which are used on the mic/headset combinations for their mic. Maybe some explanation there will help me.

DIY-make the original music-contorl earphone capable of other 3.5mm earphones

the original earphone is not the one that i want. the music controller is good, but my ears suffer a lot due to the giant top size. i cut it and combine it with a 3.5mm extended-line, so i can use my own 3.5mm earphone instead, which is much better and comfortable.
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Qi wireless receiver Micro USB adapter?

Has anyone with the VZW note 2 used one of these adapters instead of hacking up their phone and soldering in connectors? Just looking for some input on if this works well or not? Thanks.
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They can be bought here

[Q] problem in repair HTC one XL, screen does not turn on

hi
I replaced the broken USB, it is now charging, but it seems LCD display does not turn on..><
May be i did not make a good cable contact or overheat circuit and demage LCD driver.
Anyway, can anyone show me what is 1, 2, 3, 4 connector in the attached file? thx a lot.
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Replace S5 active charging port, difference between G870A and G870F?

I'm about to replace the port to hopefully get my mic working again, but when I should install it I noticed that one of the connectors is missing on the A board. And the F-board is nowhere to find. Anybody knows what this connector is for, I'll guess it's for an antenna for a different band?
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Ok, I just transplanted the circuit from the old F-board over, and everything seems to work ok, and the mic is working again!

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