Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Laptops, Portable, and Mobile Devices
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 06-08-2021, 09:37 AM   #1
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Hard Drive Not Spinning and Not Detected By PC

I have a hard drive when which has 5 and 12V present when I dismount the board from the enclosure (plates), but when I put the board on top of the drive, the 5, 12V disappear. I measured the spindle motor contacts for continuity and all contacts give me a short. my question is is the spindle motor suppose to be like that
Attached Images
File Type: jpg 20210608_112604.jpg (539.3 KB, 16 views)
File Type: jpg 20210608_112558.jpg (417.6 KB, 10 views)
Zentech is offline   Reply With Quote
Old 06-08-2021, 11:35 AM   #2
piernov
Moderator
 
Join Date: Jan 2016
City & State: Valbonne, 06
My Country: France
I'm a: Knowledge Seeker
Posts: 3,191
Default Re: Hard Drive Not Spinning and Not Detected By PC

Exact resistance?
__________________
OpenBoardview http://openboardview.org | IRC #[email protected]
piernov is offline   Reply With Quote
Old 06-09-2021, 06:15 AM   #3
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by piernov View Post
Exact resistance?
My mistake, the 5, and 12V are present when I connect the enclosure. But the plates are not spinning... I wanted to edit original post but I can't. What does that mean that the spinner is bad? I don't hear the needle moving either
Zentech is offline   Reply With Quote
Old 06-09-2021, 06:52 AM   #4
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

Test voltage on the 3 parts circled in the attached picture

http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html
Attached Images
File Type: jpg Resistor,fuse (maybe),TVS Diode.JPG (81.9 KB, 26 views)
SMDFlea is online now   Reply With Quote
Old 06-09-2021, 07:18 AM   #5
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by SMDFlea View Post
Test voltage on the 3 parts circled in the attached picture

http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html
these are my measurements:
small resistor at bottom of picture: 5V on both ends
middle size resistor (on top of small one): 5V on lower end of pic (no voltage on other side)
diode on top of picture: no voltage on either end

thanks for help
Zentech is offline   Reply With Quote
Old 06-09-2021, 08:04 AM   #6
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by Zentech View Post
these are my measurements:
small resistor at bottom of picture: 5V on both ends
middle size resistor (on top of small one): 5V on lower end of pic (no voltage on other side)
diode on top of picture: no voltage on either end

thanks for help
Test the top part first (TVS diode) using the instructions in the link i posted . 5/ How do I test a TVS diode?
If it tests ok replace the middle part.Can you see the marking on top if it ,and do you have any donor PCB`s hanging around
SMDFlea is online now   Reply With Quote
Old 06-09-2021, 08:41 AM   #7
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by SMDFlea View Post
Test the top part first (TVS diode) using the instructions in the link i posted . 5/ How do I test a TVS diode?
If it tests ok replace the middle part.Can you see the marking on top if it ,and do you have any donor PCB`s hanging around
I did an in circuit test of Resistance of both diods:
both tested pretty much identical: reverse 10K, forward 0.8K ~ 1K.

my question is should I have a voltage on one side of the diode. B/c I don't so that means the diode is probably bad. My question is why is not shorted to ground. I tested continuity and it is not giving me a short. I read the article you posted and the symptoms are identical. When I pressed the power button, it will not turn on the laptop.
ps: my meter doesn't have scale for measuring resistance
Zentech is offline   Reply With Quote
Old 06-09-2021, 01:43 PM   #8
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

They seem ok .Its the fuse thats gone.Some resistance measurements would be good ,what model is your meter,post a picture of it.

Last edited by SMDFlea; 06-09-2021 at 01:44 PM..
SMDFlea is online now   Reply With Quote
Old 06-16-2021, 07:38 AM   #9
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by SMDFlea View Post
They seem ok .Its the fuse thats gone.Some resistance measurements would be good ,what model is your meter,post a picture of it.
Where's the fuse on the picture? Is the big component next to the diodes?.. I purchase another board, replace the bios and recovered the data... thanks to all, but I still will like to salvage the board. I lift both diodes from the board and the 5V still no show.
Zentech is offline   Reply With Quote
Old 06-16-2021, 07:46 AM   #10
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by Zentech View Post
Where's the fuse on the picture? Is the big component next to the diodes?.. I purchase another board, replace the bios and recovered the data... thanks to all, but I still will like to salvage the board. I lift both diodes from the board and the 5V still no show.
The fuse is the middle part.
SMDFlea is online now   Reply With Quote
Old 06-16-2021, 07:49 AM   #11
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

From the article at post #4

7/ What other protection devices does a HDD have?

Some drives (eg 2.5" laptop HDDs) will have a 2A or 4A fuse, others will have a polyswitch, and still others (eg Western Digital) will have a zero-ohm resistor. Some Seagate models will have an inductor in series with the TVS diode, but their function is to filter out high frequency noise, not to provide protection. Unfortunately these inductors are not fusible, so they tend to burn up rather than fail gracefully, leaving a charred mess on the PCB.
SMDFlea is online now   Reply With Quote
Old 06-16-2021, 08:15 AM   #12
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by SMDFlea View Post
Test voltage on the 3 parts circled in the attached picture

http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html
Is the fuse the one in the middle?... if so, I believe is open. I get infinite resistance and no voltage on the other side. I thought it was the diodes, so I remove them. Where can I get these diodes from? and find the value?
thanks
Zentech is offline   Reply With Quote
Old 06-16-2021, 08:56 AM   #13
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by Zentech View Post
Is the fuse the one in the middle?... if so, I believe is open. I get infinite resistance and no voltage on the other side. I thought it was the diodes, so I remove them. Where can I get these diodes from? and find the value?
thanks
Read through the thread again...

From post #6 Test the top part first (TVS diode) using the instructions in the link i posted . 5/ How do I test a TVS diode?
If it tests ok replace the middle part.Can you see the marking on top if it ,and do you have any donor PCB`s hanging around

From post #8 They seem ok .Its the fuse thats gone.Some resistance measurements would be good ,what model is your meter,post a picture of it.

From post #10 The fuse is the middle part.


So what have you done with the TVS diodes ? ,thrown them away ?
.
SMDFlea is online now   Reply With Quote
Old 06-16-2021, 12:06 PM   #14
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by SMDFlea View Post
So what have you done with the TVS diodes ? ,thrown them away ?
.
I have one, the other one, broke from the heat... the one I have says A7 on top. Is there a way to know the type of diode it is?

Also how do I know the right resistance of the fuse? I'm trying not to unsolder the fuse on the good board, as that one is already working fine.
Attached Images
File Type: jpg tv_diode.jpg (37.9 KB, 6 views)

Last edited by Zentech; 06-16-2021 at 12:08 PM..
Zentech is offline   Reply With Quote
Old 06-16-2021, 02:10 PM   #15
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by Zentech View Post
I have one, the other one, broke from the heat... the one I have says A7 on top. Is there a way to know the type of diode it is?

Also how do I know the right resistance of the fuse? I'm trying not to unsolder the fuse on the good board, as that one is already working fine.
With A7 marking code its probably just a normal diode rather than TVS. The fuse looks like its marked N , if its size is 0603 - https://www.littelfuse.com/products/...fuses/441.aspx
Or 1206 - https://www.littelfuse.com/~/media/e...asheet.pdf.pdf .You should find all the parts on ebay/aliexpress .

.

Last edited by SMDFlea; 06-16-2021 at 02:21 PM..
SMDFlea is online now   Reply With Quote
Old 06-17-2021, 07:13 AM   #16
Zentech
Member
 
Join Date: Feb 2021
City & State: Florida
My Country: Usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Hard Drive Not Spinning and Not Detected By PC

Quote:
Originally Posted by SMDFlea View Post
With A7 marking code its probably just a normal diode rather than TVS. The fuse looks like its marked N , if its size is 0603 - [url]https://www.littelfu
You should find all the parts on ebay/aliexpress .
.
Are you saying any diode will do? is it a zener diode or what kind of diode should I buy? there are hundreds of them...
Zentech is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 12:06 PM.
Did you find this forum helpful?