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 Post subject: SOS HDT722525DLA380 stopped spinning
PostPosted: April 6th, 2015, 6:42 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
Hello everybody,
Yesterday, my HDD stopped spinning. I think, I am not sure, that a shortcut circuit with the desktop case happened while the HDD was running. Apparently, there is no sign of burn.
First, I cleaned up the PCB and checked the voltage at J3 (input voltage for the motor) = 0v.
At this moment, I replaced the PCB with another working hitachi family (not the same family) the motor did spin (=>the problem is not the motor).
I don't want to try hotswap and nvram resoldering for now, I just want to leave it as my last resort.
Any suggestions, schematics ,partial or full support, are welcomed. Thank you.
P.S.: The picture of the pcb is attached


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 6th, 2015, 9:07 
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Joined: April 3rd, 2015, 4:26
Posts: 59
Location: Germany
HI,

u can check with a multimeter if D2 is okay

best regards
Fabian


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 6th, 2015, 9:45 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
Thank you fabianf for you quick response.
The D2 is good, I checked. However R9 resistance is short-circuited. Do I just need to replace R9 only or check something else before running the HDD on?
Best regards.


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 7th, 2015, 6:49 
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Joined: September 8th, 2009, 18:21
Posts: 13116
Location: Australia
I would measure the voltages at transistors Q1, Q2, Q3, and coil L3.

Compare the resistance of R9 against your working board.

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A backup a day keeps DR away.


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 7th, 2015, 8:03 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
hi,
R9 has been changed successfully,it was broken, but the HDD is still not spinning.
As requested, the voltage of Q1, Q2, Q3 are as follow:
Q1 1=2.56 2=1.54 3=3.29
Q2 1=3.97 2=5.29 3=3.29
Q3 1=3.29 2=1.58 3=2.60
I pray to god it will not be the IC motor, my live depend on that HDD.
Best regards.


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Q3.jpg
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Q1.jpg
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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 7th, 2015, 9:55 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
I forgot to mention L3 voltage, it is 5.31v


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 7th, 2015, 17:18 
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Joined: September 8th, 2009, 18:21
Posts: 13116
Location: Australia
It looks like the Vcore and Vio voltages (1.6V, 2.6V, 3.3V) are present.

I should have asked for the L1 coil as well. L1 and L3 constitute a Cuk regulator which supplies -5V to the preamp. Do you measure -5V at L1?

Other than those measurements, I don't see what else you could do other than measure the resistances of the zero-ohm resistors and the two 4R7 resistors below the MCU, plus L4 and L2. There is also R5 (R47) near the lower 100uH coil.

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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 7th, 2015, 17:19 
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Joined: April 3rd, 2011, 0:19
Posts: 1986
Location: Providence, RI
You can forget about hotswap, need to transfer NV-RAM and problem will be solved. :D

Just use a good hot air smd rework station and wet the contacts with some flux.

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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 8th, 2015, 6:13 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
here are the measurements:
L1 = -3.03v
4R7= 0,8 ohm
L2 and L4 = 0,8 ohm
R5 (R47) = 1 ohm


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 8th, 2015, 6:40 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
I just want to add
I don't think the measurement I took of the resistors above are 100% accurate. These resistors are typically 10–50 mΩ. My multimeter is not equiped with mΩ function.
All I can tell, I checked with a continuity test and they all gave a positive results including the coils L1 and L4.


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 8th, 2015, 8:58 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
Right now I am thinking about PCB swap+Nvram resoldering data-medics, do you think it is a guaranteed method? and what are my chances to get my data back? it sound too easy that I am afraid to apply it. I am afraid also to give my self false hopes.


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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 8th, 2015, 18:11 
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Joined: September 8th, 2009, 18:21
Posts: 13116
Location: Australia
Everything looks OK to me. The resistance measurements would be affected by the resistance of the meter leads.

If the NVRAM is OK, then ISTM that a PCB swap and chip transfer would be your next logical step.

Best of luck.

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 Post subject: Re: SOS HDT722525DLA380 stopped spinning
PostPosted: April 8th, 2015, 18:21 
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Joined: April 6th, 2015, 5:34
Posts: 24
Location: ALGERIA
A mere 'thank you' is not sufficient to express my incredulous appreciation to fzabkar,


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