Note 4 No Sign of Life

Question

Samsung Galaxy Note 4

Samsung Galaxy Note 4は2014年10月にリリースされたスマートフォンです。Galaxy Note 4のモデル番号は、米国の種類のSM-N910、SM-N910A、SM-N910T、SM-N910V、SM-N910R4です。

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Alex @boostedmoose115

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投稿日: 2018年1月19日

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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 さんによる2018年1月20日

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 さんによる2018年1月22日

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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 評価: 782.5千 1.1千 893 2.3千 · Answer 1 · 2018-01-19T20:23:14-07:00

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oldturkey03 @oldturkey03

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投稿日: 2018年1月19日

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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 iFixitでの質問に画像を追加する方法 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 さんによる2018年1月19日

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 さんによる2018年1月20日

Updated.....

Alex さんによる2018年1月20日

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 さんによる2018年1月24日

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 さんによる2018年1月24日

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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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