www.deadharddrive.com

[gobibi]

The PCB on my Hitachi DeskStar hard drive went into smokes after connecting it to a newly purchased SATA to USB adapter. So I replaced my fried PCB with an identical board and now the drive spins but is not recognized by the BIOS. After doing a little research I found out that I was suppose to solder a chip (NVRAM/Rom) off of my fried PCB and onto my new PCB. But I am confused about which chip this is.

Here is the image of the bad PCB:


The section that I have labeled as A reads;
S93C76
ADVH4
8476

And the section that I have labeled as B has no visible chip.

Here is the image of the good PCB:


The section that I have labeled as A reads;
S93C76
ADVH3
7312

The section that I have labeled as B reads;
Pm25L V010
AE0807
M05265L

And here is a comparison image of the two;


Why does my bad PCB not have a second chip like the good PCB? Also, do I solder Chip A off of the bad PCB and onto the good PCB? Any help would be GREATLY appreciated. I had a company quote me on how much it would cost for them to recover the data and its way out of my budget.