March 21st, 2022, 23:35
March 23rd, 2022, 4:42
March 23rd, 2022, 13:17
April 5th, 2022, 15:33
Lardman wrote:The bios is pulling the drive ID from the rom rather than the drive.
Nice clear board pics, D3 and R67 are worth checking as are D4 and R64. I'd be concerned if D1 is blown, I believe that's protection for smooths VCC although I don't have a datasheet for L7251. fzabkar has made a number of posts about the poor power protection design on WD's, are you sure it was power outage and not psu cable related?
fzabkar wrote:D1 is a flywheel diode for the Vcore or Vio regulator. If it were faulty, then I can't see how the MCU would work, in which case the drive would not ID.
I have no idea what D5 does.
I would think all the supplies would be OK, but you can measure them just to be sure.
Is it possible that the drive has been configured to power up in standby (PUIS)?
April 5th, 2022, 16:30
May 17th, 2022, 4:18
fzabkar wrote:Measure the voltages.
Launch HDAT2 with the "/w" switch, or boot from a live Linux distro.
If the voltages are OK, and the drive doesn't wake up, then transfer the ROM to a donor PCB.
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