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Old 01-17-2022, 11:59 AM   #1
paparazzo79
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Default flipping adapter on external HDD got it "alive"

Hi guys.
The adapter for my external WD My Book was left on the wall socket (extender).
I connected the USB cable to the laptop and nothing the disk was dead (I couldn't hear motors).
Gosh I got scared that my HDD died on me...I tried other PCs same issue.
Then I unpluged the adapter from wall socket(extender) and just flipped it other direction.Now it works.
Now I want to know,curiosity killed me,why does it matter in this case,how to adapter is plugged in.
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Old 01-17-2022, 01:55 PM   #2
stj
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Default Re: flipping adapter on external HDD got it "alive"

because the contacts in it are bent or shit?
you need to check that - if it happens with a high current device it could arc and catch fire.
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Old 01-17-2022, 02:20 PM   #3
diif
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Default Re: flipping adapter on external HDD got it "alive"

If you were worried you'd lost it, that's an indication you don't have a back up.
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Old 01-18-2022, 11:07 AM   #4
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Default Re: flipping adapter on external HDD got it "alive"

I think you guys did not understand my question.
Perhaps I need to draw?
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Old 01-18-2022, 12:21 PM   #5
eccerr0r
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Default Re: flipping adapter on external HDD got it "alive"

Simple explanation that doesn't make any assumptions:

You're getting DC electricity at your wall socket and your power supply is half wave.

However this is very unlikely and probably as stj says - your contacts in the extension cord are bad and plugging it in the other way happened to make things connect properly. AC electricity shouldn't matter which way you plug it in as the next cycle it looks like the same as before.

If your electricity is not quite clean like has a large DC offset it could do this, while still "AC" it will confuse cheap power supplies that omit a bridge rectifier (or if the bridge rectifier is bad).
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Old 01-18-2022, 12:24 PM   #6
paparazzo79
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Default Re: flipping adapter on external HDD got it "alive"

Quote:
Originally Posted by eccerr0r View Post
Simple explanation that doesn't make any assumptions:

You're getting DC electricity at your wall socket and your power supply is half wave.

However this is very unlikely and probably as stj says - your contacts in the extension cord are bad and plugging it in the other way happened to make things connect properly. AC electricity shouldn't matter which way you plug it in as the next cycle it looks like the same as before.

If your electricity is not quite clean like has a large DC offset it could do this, while still "AC" it will confuse cheap power supplies that omit a bridge rectifier (or if the bridge rectifier is bad).
Connected to brand new surge protector.
Doesn't matter,seems like I need to do a video so I can explain things here.
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Old 01-18-2022, 01:04 PM   #7
paparazzo79
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Default Re: flipping adapter on external HDD got it "alive"

Ok so I draw the explanation on the pics:
Works not working meant on External HDD My Book 8TB
Attached Images
File Type: jpg 20220118-195728.jpg (121.7 KB, 9 views)
File Type: jpg 20220118-195741.jpg (119.7 KB, 10 views)
File Type: jpg 20220118-195754.jpg (110.7 KB, 10 views)
File Type: jpg 20220118-195808.jpg (94.0 KB, 10 views)

Last edited by SMDFlea; 01-18-2022 at 02:08 PM..
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Old 01-18-2022, 01:31 PM   #8
petehall347
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Default Re: flipping adapter on external HDD got it "alive"

wire might be broken here ...
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File Type: png Screenshot from 2022-01-18 19-30-47.png (24.4 KB, 10 views)
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Old 01-19-2022, 09:19 AM   #9
paparazzo79
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Default Re: flipping adapter on external HDD got it "alive"

Nope.
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File Type: jpg 20220119_161526.jpg (656.8 KB, 8 views)
File Type: jpg 20220119_161514.jpg (473.7 KB, 6 views)
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Old 01-19-2022, 02:35 PM   #10
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Default Re: flipping adapter on external HDD got it "alive"

Please post a short video of what is going on here
__________________
9 PC LCD Monitor
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30 Desk Top Switching Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board ( VFD Failure Five Years Later )
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
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