Won't turn on, won't charge battery

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Samsung Galaxy Tab Pro 10.1

10.1" tablet released in February 2014, powered by a custom version of Android 4.4 KitKat, and identified by model number: SM-T520NZKAXAR

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Ruben Lopes @rubenlopes

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Ruben Lopes

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发帖于: 2015年10月4日

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Won't turn on, won't charge battery

Hello! I open this topic becouse I think this is a diferent problem from the other topics.

I try to fix a SM-T 520 how won't turn on. I replace the USB charge flex cable but it Still not working. With multimeter it is possible mensure 5,4V in one diodo in motherboard when it plug to charger (the current arrives to motherboard) , but in the battery plug pin's arrives only 0,2V how it's not enought to charge battery. The battery shows 3,7V and I think it's not enought to turn on the device. Next week I will try to connect to a variable power supply to know if is a battery problem but I don't beleave. I try every possible reset solution but it don't turn on and it don't show's any led light when it plug to charge. Thank you

Picture from the motherboard

Another picture from the motherboard.

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Good picture but it shows only part of the board. For the charging circuit we need to see the rest of it as well.

由 oldturkey03 完成的 2015年10月4日

Its further to the left under an EMI shield :-)

由 oldturkey03 完成的 2015年10月5日

由 Ruben Lopes 完成的 2015年10月5日

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oldturkey03 @oldturkey03

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rubenmplopes, just because you got some 5.4V on a random diode, does not mean that your charge connector is working. I would suggest that you measure on the connector itself. If you only got 0.2V on the battery connector and if your charging port shows the proper voltage on the pins, then you do want to check the power management IC as well as other components on your charging circuit.

Use this guide to add images.

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Thank you for your answer. I allready check the charger cable how plug to motherboard and somewhere in the ribbon cable I mensure 5.4V. Next step is find the power manager IC... I can't find any motherboard schematic on web... Another thing I forgot to tell is the tablet works fine untill battery drained. After it don't charge and don't shows any signal.

由 Ruben Lopes 完成的 2015年10月4日

"untill battery drained" sounds like either a bad battery or bad PMIC. Post some good pictures of your logicboard with your question, that way we can identify a few parts for you.

由 oldturkey03 完成的 2015年10月4日

You can see the picture from the motherboard

由 Ruben Lopes 完成的 2015年10月4日

I post another photo

由 Ruben Lopes 完成的 2015年10月5日

Hello oldturkey03 did you find any solution? Thank you

由 Ruben Lopes 完成的 2015年10月6日

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Good picture but it shows only part of the board. For the charging circuit we need to see the rest of it as well. — oldturkey03
Thank you for your answer. I allready check the charger cable how plug to motherboard and somewhere in the ribbon cable I mensure 5.4V. Next step is find the power manager IC... I can't find any motherboard schematic on web... Another thing I forgot to tell is the tablet works fine untill battery drained. After it don't charge and don't shows any signal. — Ruben Lopes
"untill battery drained" sounds like either a bad battery or bad PMIC. Post some good pictures of your logicboard with your question, that way we can identify a few parts for you. — oldturkey03

Samsung Galaxy Tab Pro 10.1

Won't turn on, won't charge battery

Update (10/04/2015)

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Update (10/04/2015)

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