Burnt the circuit board on my Seagate FreeAgent Pro 750 Gb by connecting it directly to a 12 V DC source (my boat) Seagate chat-help says they consider the product non-servicable but I just need another board or an alternative power supply. The board is produced by Lantek and may be the same for the other Pro models like the 500 Gb
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her are some power Adapters listed on amazon. Also, look on the bottom to see what polarity it is (also by mosue over the picture of the adapter in the bottom link (to zoom in)
The disk is either damaged or the USB interface is damaged. 1) You could try opening the external case and connect the disk to your computer directly (Using IDE/S-ATA cables) 2) Format the HD and use data recovery software/service.
I don't know which drives they use in Freeagent, or even how you open the case (don't remember seeing any screws on mine), but Seagate drives (baraccuda especially) are known to have a weakness with the diode between 12V and Ground.
If it seems like it's shorting, (put a meter across the power input before you bother opening it - if it's reading about 1 Ohm, this may be your issue) might be worth opening the case and checking for a small square surface-mount diode marked BUX C??? (? being a variable number). If it's shorted, then clip it out for a quick-and-dirty backup of your data & bin the drive, or fix with a suitable replacement diode (SMD 1N4004 has been suggested).
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