Rom chip

[Abdul Rauf]

ST3250318AS
Barracuda 7200.12
250 GB

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

Attachments

[michael chiklis]

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

[fzabkar]

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

[Abdul Rauf]

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

[michael chiklis]

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

[Abdul Rauf]

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.

[mr_spokk]

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.

Then you have a shortcircuit in ROM

[moiz h/d]

i think need a firmware reset with terminal mode

[fzabkar]

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

Is your photo showing the damaged board or the donor?

[Abdul Rauf]

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

Attachments

[fzabkar]

See attachment.

Attachments

Donor_pin_4_8.jpg (17.15 KiB) Viewed 11374 times

[northwind]

Then you have a shortcircuit in ROM

+1
That can be caused by poor soldering too.

[michael chiklis]

+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

[Abdul Rauf]

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

Attachments

[northwind]

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

[fzabkar]

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

[muhammad shafiq za]

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.

Then you have a shortcircuit in ROM

100% true