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 Post subject: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 4th, 2007, 4:30 
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Joined: October 19th, 2007, 0:30
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Hello all HDD Gurus :)

in this topic we will Discuss the Causes & Solutions of Two Main types of Noise Which is occured in WD HDDs (Especially Related To L-shape PCBs).

Clicking Noise and Continuous Noise
------------------------------------------------------------------------------------------

1- The Clicking Noise
when u power on the hard drive u will hear a noise like (click,click....click,click...click,click)
this noise may be related to the head stack or PCB, the first thing you have to do is to check the PCB By The following steps:

1- first u have to clean the Whole PCB With a Solvent & Toothbruch then wipe it with a piece of smooth handkerchief to remove the dust & dirt from it.
Caution: Cleaning of the PCB must be done carefully to avoid removal of any small electronic components.

2- Check the Resistor (R120) , [ the right value of this Resistor is (0.12 Ohm) ] ,u may adjust ur multimeter to Resistor Measuring Mode to Determine its Value ,if it's Damaged u have to replace it. but before that, u have to check Transistor Q3 , it's a 6 pins transistor , for measuring this transistor u may adjust ur multimeter to Diode Mode,[ the right Value will be: (first two pins = 0.000 , second two pins =0.000 , Third two pins = nearly over 600)]
if Q3 is Damaged it will burn ur R120 after u replace it , so be sure that Q3 is ok before replacing R120 & u may also Check Transistor Q6 by the previous method to be completely sure it's safe to replace R120.
Note: ( to be sure of The right values of these electronic components u may compare the values u have measured with the values of a working PCB's Components)

3- Check The Coils (such as L2 & L7) - adjust ur multimeter to diode mode then the right value must be ( 0.000 ) for any coil as u all know.

4- inspect the whole PCB for any removed component ( such as small capacitors or Resistors ) ... the removal of these small components may occured while forced cleaning of the PCB .... so becareful while cleaning it.

5- in rare cases the firmware microchip may be damaged.

the link below contains a high resolution image which shows all the electronic components I have mentioned above - i'm very sorry i couldn't upload it to this forum cause it's over than 512 KB.

http://link.imgshare.us/a4j2BZ

------------------------------------------------------------------------------------------

2- The Continuous Noise

sometimes there is a continuous noise come from WD HDDs mainly with L-shape PCBs
with motor ICs ( Smooth 1.3) , (L6278 1.7) & (L6278 1.2).

the noise is like : Trrrrrrrrrrrrrr or Trrrr....Trrrr...Trrrrr

so all we have to do for fixing this problem is:

1- clean the connection points which connect the head stack pins with the PCB using a pencil Rubber ...carefully.

2- clean the motor IC pins thoroughly using a solvent & Toothbrush then wipe it with a piece of smooth handkerchief to remove the dust & dirt from it.

-Note- the two steps mentioned above solve the problem in few cases.

3- if the two steps mentioned above didn't fix the problem , you have to replace the motor IC cause it's damaged.

-Note- in case of Motor ICs (L6278 1.7) & (L6278 1.2) first try to desolder them then resolder them again before u decide to replace them with a new ones ... this sometimes work , but if it didn't work ... replace them directly.
- in case of Motor IC (Smooth 1.3) you must replace it directly.

The image below Shows you where to clean.

I hope this topic will be helpful for u all

any inquiries .... any new suggestions .... any criticism ... u all r welcome :)


Best Regards & Good Luck
Ahmed_Samy


Attachments:
WD PCB.JPG
WD PCB.JPG [ 78.16 KiB | Viewed 19319 times ]

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 4th, 2007, 9:23 
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Thanks my friend!!
:good:
:idea:

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 4th, 2007, 18:05 
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Location: Belgium
Nice tutorial, Ahmed!


Dobre

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 6th, 2007, 2:31 
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Joined: October 19th, 2007, 0:30
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u all r welcome :)

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 7th, 2007, 21:49 
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Joined: October 19th, 2007, 0:30
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Location: Egypt
Hello all,

Caution :idea: : it's Strongly Recommended To replace The Motor IC Directly when you are sure that it's damaged (I mean when it's damaged without any external symptoms like burns) ... even if it's (L6278 1.7) or (L6278 1.2) without any attempts with the Damaged IC (cause i think that trying to fix the problem by desoldering the damaged IC and resoldering it again (in case of Motor ICs (L6278 1.7) or (L6278 1.2) as i mentioned above) may damage the PCB when you power it on again with the damaged IC.
(I Experienced that in rare Cases so i should tell you all to be aware of that :) )

Shortly : when the Motor IC is damaged ... just replace it Directly.

Best Regards
Ahmed_samy

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 12th, 2007, 13:29 
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Joined: June 27th, 2006, 11:33
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Location: In ur HDD !
Addition to the topic there is another way to check the motor IC u can check its temprature after powering the drive if it gets hot then change motor IC .


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: November 14th, 2007, 5:01 
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Joined: October 19th, 2007, 0:30
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Location: Egypt
yes Rameez that's right .... feeling IC heat is one of the most common methods to detect the Motor Ic Damage especially when the hard drive didn't respond after we power it on .... but when the motor IC is responsible for the Continuous Noise i think it's never got Hot and its' temperature will be normal although it's already damaged ... so we have to replace it.

Caution :idea: Don't Forget to ground yourself when you are working with HDD PCBs to avoid the risk of ESD (Electrostatic Discharge) Cause it may damage the PCB or even may affect the long term reliability and performance of its' components .... so ground yourself first before touching the PCB's Components.

for more info about (ESD) Visit:
http://en.wikipedia.org/wiki/Electrostatic_discharge
http://en.wikipedia.org/wiki/Electrostatic_sensitive_device

Good Luck For you All
Ahme_Samy

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: December 5th, 2007, 22:02 
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i'm very sorry that the download link of the high resolution image got invalid .... so here is a valid one ... i'm sorry i couldn't attach it directly to this forum cause it's over 512 KB.

any time it got invalid .... just tell me to send it by e.mail

http://rapidshare.com/files/74592343/WD_L_PCB.jpg.html

Best regards & Good Luck
Ahmed Samy

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: December 7th, 2007, 18:29 
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Joined: October 19th, 2007, 0:30
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another valid image link below:

http://link.imgshare.us/b7jbBb

Best Regards & Good Luck
Ahmed_Samy

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: December 12th, 2007, 13:58 
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Joined: December 5th, 2007, 22:28
Posts: 8
Ahmed,

You seem to be very knowledgeable in PCB ; i have myself a problem with my drive's PCB (hard-disk-drives-repair-and-data-recovery-f1/pcb-needed-for-diamondmax-21-250-go-t8176.html) and i wondered if i can send it to you for repair?

Any other suggestions are much appreciated.


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: December 14th, 2007, 13:09 
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Hello Gene: :)

first let me welcome u as a new member in this forum

i read ur topic which is entitled with "PCB needed for Diamondmax 21 250 Go"

it seems that your donor PCB has a different model of Motor IC ( the small square one u have mentioned in ur topic) - but i'm not sure if it represents a problem in this model of maxtor or not.

u know Gene here in egypt the most common Hard disk is western digital (WD) so i got much experience in WD HDDs but my experience with maxtor is limited.... Cause it's not common here in egypt.

i hope that one of HDD gurus have good experience with maxtor HDDs could help u solving ur problem.

Best Regards & Good luck
Ahmed Samy

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: February 18th, 2008, 16:13 
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Joined: February 18th, 2008, 15:59
Posts: 2
Hi Ahmed,

Thanks for your fantastic article. However, I do not have an L-Shaped board and I'm having trouble finding some of the components you referred to. I have put a picture of my board at the following link; I'd be grateful if you could highlight the components on it and email it back to me. I will repost it there so that other people can refer to it too.

http://www.leapbeyond.com/ric/WD1200JB%20board.jpg

Also, do I have to desolder the components to test them, or can they be tested directly on the board?

Thanks!

-Richard


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: February 21st, 2008, 20:01 
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Hello Richard,

first let me thank you for your kind words about my article.

your board is a different model - most of the components i have mentioned above
belongs to WD L-shape PCBs.

just tell me what is the problem with this board , so i can help you :) .... is it a clicking noise issue ??

about testing the components , you can test them directly on the board with the multimeter without Desoldering them.

Best Regards & Good Luck
Ahmed_Samy

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: February 22nd, 2008, 2:45 
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Joined: February 18th, 2008, 15:59
Posts: 2
Hi Ahmed,

Thanks for the fast response! Yes it is a clicking noise. When I power on the drive, it spins up and goes "Click, click"... pause... "Click Click". It does this about 10 times then spins down.

-Richard


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: February 22nd, 2008, 3:32 
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Joined: May 21st, 2007, 16:10
Posts: 1441
Location: Gothenburg/ Sweden
Hi Richard,
The clicks in your drive can be 4 tings: faulty Pcb, Firmware, preamp/heads or scratched platters.
You should try the Pcb first, that you do by:
1.Buy a new/used drive or Pcb of the same harddrive model you got (WD1200JB).
2.Desolder the ROM chip (U12, red ring in the picture) on your old board.
3.Replace the chip on the new board.
4.Start up the drive and access your files.

If your drive still knocks or clicks after that, the problem is further down the line and not so easy to do without special tools.

Regards/ Bosse

[img]
Attachment:
WD1200JB_board.JPG
WD1200JB_board.JPG [ 411.57 KiB | Viewed 19179 times ]
[/img]

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: February 22nd, 2008, 13:21 
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that is it , richard .... i think mr_spokk did the job completly :good:

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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: March 23rd, 2008, 8:03 
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Joined: March 23rd, 2008, 5:39
Posts: 2
Hello Ahmed_Samy, thanks for the great article.

Recently a power surge killed my hard drive. Drive doesn't spin up or detect in BIOS.
A closer inspection revealed that the R120 and a STPA (what's that component?) has burned. Other components still looks Ok with root eyes.
So, if R120 is burned, the drive won't spin up? What about STPA?
Here is the photo of my PCB

I'm going to get a dead WD 40GB from a friend to get two of these component.

Thanks in advance.

Edit: Got your picture, STPA is Q3... i see...


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: March 23rd, 2008, 13:46 
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Joined: June 27th, 2006, 11:33
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Location: In ur HDD !
R120 acts like a fuse in marvell pcbs if any of the components burns it burns it self to prevent further damage . Replace STPA and check STPB as well and sometimes D3 the diode also gets damage check that too . If everything else is good replace the damaged components only .


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: March 24th, 2008, 15:10 
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Joined: March 23rd, 2008, 5:39
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Thank you rameez :good:, however I couldn't found STPB on my board, perhaps you mean another STPA? (Q6)


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 Post subject: Re: Noise related to PCB in WD HDDs (Final Edition)
PostPosted: March 25th, 2008, 16:31 
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Joined: June 27th, 2006, 11:33
Posts: 2314
Location: In ur HDD !
yes thats SPTB .


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