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Rom chip

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Abdul Rauf

Post subject: Rom chip

Posted: May 28th, 2013, 5:48

Joined: May 6th, 2013, 2:48
Posts: 84

ST3250318AS
Barracuda 7200.12
250 GB

PLEASE guide me where is the (ROM CHIP)on this pcb

Attachments:

PCB.JPG [ 108.82 KiB | Viewed 12876 times ]

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michael chiklis

Post subject: Re: Rom chip

Posted: May 28th, 2013, 5:56

Joined: December 5th, 2011, 5:38
Posts: 1768
Location: Verona, Italy

Top left corner chip.
Should be written on it 25P40 or 25X40 or something similar

Attachment:

PCB.JPG [ 81.88 KiB | Viewed 12872 times ]

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fzabkar

Post subject: Re: Rom chip

Posted: May 28th, 2013, 6:24

Joined: September 8th, 2009, 18:21
Posts: 17323
Location: Australia

http://www.users.on.net/~fzabkar/HDD/HD ... Flash.html
http://www.users.on.net/~fzabkar/HDD/HD ... _Regs.html

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Abdul Rauf

Post subject: Re: Rom chip

Posted: May 28th, 2013, 7:33

Joined: May 6th, 2013, 2:48
Posts: 84

when i replace the patient's pcb with donor pcb, i also replace the ROM chip of patient pcb the power goes off. hdd has no detection

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michael chiklis

Post subject: Re: Rom chip

Posted: May 28th, 2013, 7:35

Joined: December 5th, 2011, 5:38
Posts: 1768
Location: Verona, Italy

What are the original symptoms with the original pcb?
Why do you think that your pcb is faulty?

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Abdul Rauf

Post subject: Re: Rom chip

Posted: May 28th, 2013, 8:05

Joined: May 6th, 2013, 2:48
Posts: 84

PATIENT PCB has no power , it is already dead.
when i replace a patient dead pcb
with donor ok pcb,the hdd power is on,but has no detection.
I replace ROM chip off ok pcb with dead pcb power goes off.

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mr_spokk

Post subject: Re: Rom chip

Posted: May 28th, 2013, 8:26

Joined: May 21st, 2007, 16:10
Posts: 1592
Location: Gothenburg/ Sweden

Abdul Rauf wrote:

Then you have a shortcircuit in ROM

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moiz h/d

Post subject: Re: Rom chip

Posted: May 28th, 2013, 8:42

Joined: May 5th, 2013, 14:29
Posts: 94
Location: hdd/myself

i think need a firmware reset with terminal mode

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fzabkar

Post subject: Re: Rom chip

Posted: May 28th, 2013, 8:53

Joined: September 8th, 2009, 18:21
Posts: 17323
Location: Australia

Measure the resistance between pin #4 and pin #8 of the flash chip.

Is your photo showing the damaged board or the donor?

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Abdul Rauf

Post subject: Re: Rom chip

Posted: May 28th, 2013, 9:33

Joined: May 6th, 2013, 2:48
Posts: 84

please Mr fzabkar
see these both pictures of patient & donor pcb & guide me

Attachments:

DONOR.JPG [ 66.09 KiB | Viewed 12820 times ]

PATIENT.JPG [ 59.02 KiB | Viewed 12820 times ]

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fzabkar

Post subject: Re: Rom chip

Posted: May 28th, 2013, 15:31

Joined: September 8th, 2009, 18:21
Posts: 17323
Location: Australia

See attachment.

Attachments:

Donor_pin_4_8.jpg [ 17.15 KiB | Viewed 12779 times ]

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northwind

Post subject: Re: Rom chip

Posted: May 29th, 2013, 4:32

Joined: January 28th, 2009, 10:54
Posts: 3551
Location: Greece

mr_spokk wrote:

Then you have a shortcircuit in ROM

+1
That can be caused by poor soldering too.

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michael chiklis

Post subject: Re: Rom chip

Posted: May 29th, 2013, 4:39

Joined: December 5th, 2011, 5:38
Posts: 1768
Location: Verona, Italy

northwind wrote:

+1
That can be caused by poor soldering too.

Will help using a bit of flux or higher soldering temperature and higher air pressure.
With my soldering station i do it usually at 300° C

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Abdul Rauf

Post subject: Re: Rom chip

Posted: May 29th, 2013, 5:35

Joined: May 6th, 2013, 2:48
Posts: 84

Mr northwind
see the picture.i have sold the Rom chip accurately.
but the problem remain same

Attachments:

rom chip.JPG [ 127.62 KiB | Viewed 12746 times ]

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northwind

Post subject: Re: Rom chip

Posted: May 29th, 2013, 9:47

Joined: January 28th, 2009, 10:54
Posts: 3551
Location: Greece

I'm not sure pin #4 (which by the way involves itself into the power supply) is making good contact.

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fzabkar

Post subject: Re: Rom chip

Posted: May 29th, 2013, 12:21

Joined: September 8th, 2009, 18:21
Posts: 17323
Location: Australia

Wrong chip ...

NTMSD3P102R2, ON Semiconductor, marking E3P102, FETKY P–Channel Enhancement–Mode Power MOSFET & Schottky Diode, Dual SO–8, –3A, –20V, 0.085 ohms:
http://www.onsemi.com/pub/Collateral/NTMSD3P102R2-D.PDF
http://www.datasheetcatalog.org/datashe ... 02R2-D.PDF

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muhammad shafiq za

Post subject: Re: Rom chip

Posted: September 18th, 2013, 17:31

Joined: December 14th, 2012, 17:53
Posts: 9
Location: karachi

mr_spokk wrote:

Abdul Rauf wrote:

Then you have a shortcircuit in ROM

100% true

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