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 Post subject: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 19th, 2019, 14:58 
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Location: California
Got a Hitachi 4TB HUS726040ALE614 from a G-Drive enclosure. PCB PN: 0J50178. No signs of life when power is connected. PCB has no signs of damaged or burned components and nothing heats up when power is applied to bare PCB. Thinking PCB + ROM swap. Suggestions? Thanks.


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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 19th, 2019, 15:14 
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Joined: December 19th, 2006, 8:49
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Location: Portugal
Do you have firmware tools ? First step plug PCB only to POWER + Firmware tool and check if drive does reach DRDY/DSC even if it's BSY for a while. If so you can use VSC (generic) to access and read NVRam. Don't need specific VSC like it would to read modules.

If PCB doesn't report register status (like when you don't plug anything to the port of the firmware tool) then PCB is gone and needs replacement + ROM chip swap (with NVRam + ROM content on it).

Posting a full picture of the PCB (component side) might helps as other people might mark on the photo measuring points so that you can measure the PCB voltage with multimeter.

If it was a drive that i were to attempt to recover (for a client) i would test PCB first with firmware tool and if PCB is gone and there are no simple reason like blown fuse or diode that is shorted, etc i would simply remove and replace PCB with compatible one. Do read ROM with programmer just to be on safe side.

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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 19th, 2019, 15:52 
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I don't have firmware tools unfortunately. Here's a pic
Image


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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 19th, 2019, 18:03 
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Joined: September 8th, 2009, 18:21
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Check that PUIS is not enabled. You can disable PUIS with HDAT2.

Check the TVS diodes and fuses.


Attachments:
TVS_fuse.jpg
TVS_fuse.jpg [ 77.6 KiB | Viewed 1993 times ]

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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 20th, 2019, 6:54 
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What is the function of the 2-strip component between the fuse and the tvs of the 5-volt line?

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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 20th, 2019, 7:12 
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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 20th, 2019, 14:39 
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Joined: March 24th, 2010, 21:08
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fzabkar to the rescue once again. thank you for the tip! I should have caught that myself... next time.

12v fuse and 12v tvs diode were both toast. replaced them & bam, drive up and running. extracting the data now.

Thanks to everyone else for the other suggestions as well!


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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 20th, 2019, 18:06 
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mhp666 wrote:
What is the function of the 2-strip component between the fuse and the tvs of the 5-volt line?

That appears to be a Schottky rectifier diode. Often it exists on its own, without the parallel connected TVS diode, in which case it provides protection from reverse polarity. However, I confess that I don't understand why it is needed in this case since the TVS diode should provide the same protection and more. :?

BTW, automotive equipment often has "d*ckhead diodes" to contain the damage in case the user reverses the polarity of the battery.

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 Post subject: Re: Hitachi 4TB HUS726040ALE614 No Power
PostPosted: June 21st, 2019, 6:59 
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managerharry wrote:
That appears to be a Schottky rectifier diode. Often it exists on its own, without the parallel connected TVS diode, in which case it provides protection from reverse polarity. However, I confess that I don't understand why it is needed in this case since the TVS diode should provide the same protection and more. :?

BTW, automotive equipment often has "d*ckhead diodes" to contain the damage in case the user reverses the polarity of the battery.


hanks for the info.
I would have seen logic in a capacitor, as a low frequency filter.

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