HDT725040VLA380 u5 and cpu?

[utdr]

Hi I have a Hitachi 400GB HDT725040VLA380 that is unresponsive. I can find no burnt components it simply does nothing. I have a donor on the way, my question is do i need to switch the cpu as well as the u5 eeprom? u7 is unpopulated.
Thanks, Ben

Attachments

[fzabkar]

Can you measure the resistances of the two diodes near the legacy power connector, on each side of the "100 ME" coil?

[BlackST]

What diags you have? Pc3000 , SD, other?

[utdr]

The diodes and coil are the first thing I suspected but they are fine. I am worried that the cpu is dead and that it has adaptive's on it. The drive is unresponsive and no discernible status makes it through the sata translator to the pc3k.
Thanks, Ben

[BlackST]

"the cpu is dead and that it has adaptive's on it"

Put UDMA to work and use the relative know-how, please !

If the PCB is completely dead, you can make another identical PCB work for you, eventually.

P.S. don't get confused about microcode, adaptives and... "unique stuff".