HP SAS hdd

[databack]

Hello
Anyone have a professional manual for HP SAS PCB repair?

[lcoughey]

Hello
Anyone have a professional manual for HP SAS PCB repair?

A manual? You are kidding, right? Based on the question, I suggest you outsource to a data recovery professional.

[fzabkar]

If you can upload a detailed photo of the component side of the PCB, I can show you the voltage test points.

[databack]

If you can upload a detailed photo of the component side of the PCB, I can show you the voltage test points.

Thanks for your replay

Attachments

[labtech]

SAS drives rarely have PCB issues. What test have been performed indicating a PCB failure?

[databack]

HDD power failure and replace PCB with same without change BIOS. Have a clicking sound!

[labtech]

Can't confirm off the top my head for that SAS model drive, but I would have expected a straight PCB to not cause clicking. I will see if I can find this drive and replicate this test.

[fzabkar]

The first thing I notice is that the date code on the PCB does not match the manufacture date on the label. Is the photo showing the patient PCB or the donor?

The model number, MBD2147RC, is a Fujitsu/Toshiba drive.

I have attempted to identify the circuit components and voltage test points as best as I can, but there will quite possibly be errors. If you could identify the markings on the various ICs, I could probably do a little better.

I would start by measuring the voltages across each of the TVS diodes. The +12V supply should appear across the capacitor below the 12V diode. If it doesn't then check the associated fuse (?).

Check the voltage at the output of the Vio buck regulator. You can either measure the voltage at the coil, or across the appropriate capacitor(s).

Measure the voltage between pins 8 (Vcc) and 4 (Ground) of the Winbond flash memory. This should be either 2.5V or 3.3V.

Check the voltage at the output of the Vcore buck regulator. I expect that it would measure around +1.2V.

Above the Vcore regulator is what looks like the negative supply for the preamp. Check for -5V at the test point.

Measure the voltage across each of the larger capacitors around the motor controller. One will probably be the boost capacitor (+18V ?) for the VCM circuit.

In the top left corner is what appears to be another buck regulator. Once again you can either measure the voltage at the coil, or across the appropriate capacitor(s).


A3S28D50EF, Zentel, 128Mbit DDR SDRAM, 2.5V:
http://www.zentel.com.tw/upload/product ... 9.8_Zentel

Attachments

MCU_date_code.jpg (39.12 KiB) Viewed 9017 times

Label_date_code.jpg (23.28 KiB) Viewed 9017 times

[databack]

Hi fzabkar
Thank you for your answer.
This is pictures of 2nd SAS HDD (RAID 0 with a previous HDD)
The problem of this HDD is many bad sector and I can not get correct image.
What is your analysis for this?

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[fzabkar]

Your second drive has the same date code inconsistency as the first. I confess I don't understand this. As for bad sectors, I can't see how that could point to a PCB fault. Instead it looks more like a media or head fault.

On the plus side, you have two identical PCBs that should make troubleshooting relatively easy.

[hdd_sand]

This drive are known for heads and media issues, seldom is a PCB. MHO is dead heads