I NEDD AN E157925 BOARD FOR A SEAGATE

Spare PCBs aren't usually avaiable as such. Unless something simple like a polyfuse blew on the board, then the original is probably toast. Your next option would be to obtain an identical drive and perform a transplant. But it will have to be identical - possibly down to the software revision.: (You may still have problems as tables of bad blocks are maintained by the controller)

you might have fried the voltage regulator on the board chances are the hdd is okay its a sata or ide open housing and go to tiger direct and buy whichever style hdd it is adapter to usb i.e ide to usb or sata to usb ot a new enclosure like nexstar cx once you got it hooked up if its still good you can get to your files

The Printed Circuit Board ON THE Harddrive inside the Seagate FreeAgent, or the small PCB inside the Seagate FreeAgent's external enclosure? (Case)

If you are referring to the small PCB that the Harddrive connects to, and has the USB cable coming from it, just buy an external enclosure, and install the Harddrive into it.

http://www.youtube.com/watch?v=0HZ-wTdscgc

If your Seagate is like the one in the link above, it has a laptop size Harddrive in it, and it is a SATA unit.

2.5 inches across in width. (2 and a half inches)

This is an example of a 2.5 SATA external enclosure,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3195233&CatId=2783

IF you are referring to the PCB on the Harddrive itself, good luck.

One method would be to buy another harddrive like the one in the Seagate FreeAgent, and use it's PCB so that you can retrieve your information.

Then reinstall the PCB on the new harddrive.

For additional questions please post in a Comment.

Regards,
joecoolvette

https://www.seagate.com/consumer/
the above link will take you to the best support. Personally I might acquire the same model and swap out the hard drive but Seagate offers a wide variety of data recovery as well. Some drives came with warrantied data recovery

This is an internal hard rive and therefore does not have a USB slot. I assume you are referring to the SATA connector.
The control board is not an item that can be bought separately. You may be able to buy a used drive on ebay.
Try and find someone who can solder the connector back on for you.

No just plug it in to the extra plug on the board.

Typical failures in DELL LCD monitors are: cold solder joints, bad fuse (still has continuity with high resistance), shorted MOSFET/B-POLAR transistors, bad caps, lamps assmblies.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Replacement board: http://www.lcdrepair.us

You may have a power supply that has failed. Please reference my post on the Seagate Knowledge Base website.
http://forums.seagate.com/stx/board/message?board.id=PersonalStorage&message.id=1258