Note 4 No Sign of Life

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Samsung Galaxy Note 4

Samsung Galaxy Note 4는 2014년 10월에 출시된 셀룰러 스마트폰입니다. Galaxy Note 4 모델 번호는 SM-N910, SM-N910A, SM-N910T, SM-N910V 또는 미국 버전은 SM-N910R4입니다.

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Alex @boostedmoose115

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게시일: 2018년 1월 19일

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Note 4 No Sign of Life

I've been trying to get this Galaxy Note 4 working, and it is showing no signs of life. When it is plugged in, the notification light does not show. I have tried every combination of buttons I've heard, and it won't do anything. It doesn't vibrate, the notification light does not turn on, and the screen does not turn on.

I tested for voltage on the battery terminals with the battery out and the charger connected, and it shows 4.19 volts.

I have replaced the battery with a known working battery, and it did not act any differently.

I'm pretty certain at this point that it's a hardware issue, but what can I check? Being that I'm getting voltage at the battery, I know the charging port is working properly. The only other thing I can think of is something on the motherboard is bad, but of course if anyone has any idea, I'd love to hear them!

Updated with pictures...

I just removed the motherboard for simplicity in the picture.

Tested the battery again... It is showing 3.79V. Still no sign of life. Where is PWR7000? And the other things, for that matter.

Update 2: I removed the cover, everything looks to be alright. The scratch on it is just from a screwdriver... my mistake!

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PWR7000 is your power switch

oldturkey03 의 2018년 1월 20일

I got that, I was just trying to see where the power switch leads in order to check for obvious damage.

Post updated again.

Alex 의 2018년 1월 22일

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I got that, I was just trying to see where the power switch leads in order to check for obvious damage.

Post updated again. — Alex

oldturkey03 @oldturkey03 평판: 783.2k 1.1k 893 2.3k · Answer 1 · 2018-01-19T20:23:14-07:00

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oldturkey03 @oldturkey03

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@boostedmoose115 follow the troubleshooting flowchart

If you need to find the components etc. post a couple of images of your motherboard. Use this guide 기존 질문에 이미지 추가하기 for that

for U7000 and most of the components you'll have to remove the EMI shield as pointed out

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Chances are power management of needs to be replaced.

Ben 의 2018년 1월 19일

Thank you for posting, I'll double check the battery voltage and go over the rest of the flow chart at some point today and report back.

Alex 의 2018년 1월 20일

Updated.....

Alex 의 2018년 1월 20일

Would the V_BAT voltage be the battery voltage? And what is C7128, and how do I check it? I apologize for all the questions, but I can't find anything telling me what these things are. The the wiring diagrams either don't say anything or it's just impossible to see what they say.

Alex 의 2018년 1월 24일

I personally don't think note 4s are worth repairing for power ic issues. Too easy to crack the screen on open and already tried replacing multiple chips with no success.

Their prone to going bad on this model again anyway.

Ben 의 2018년 1월 24일

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Samsung Galaxy Note 4

Note 4 No Sign of Life

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Update (01/20/2018)

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