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 Post subject: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 5:45 
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Joined: July 5th, 2007, 11:44
Posts: 48
Location: Portsmouth
We have started seeing some of these Samsung 2.5" drives with only USB connectors on the PCB. No SATA or any other connectors. The one we have is a 500GB.

Has anyone been able to find points on the PCB to access the drive via SATA or terminal?

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 11:54 
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Joined: July 5th, 2007, 11:44
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Location: Portsmouth
I have attached some PCB photos.
Attachment:
File comment: Another Samsung PCB Photo
IMG005.jpg
IMG005.jpg [ 662.19 KiB | Viewed 29910 times ]

Attachment:
File comment: Samsung PCB Photo
IMG003.jpg
IMG003.jpg [ 682.88 KiB | Viewed 29910 times ]

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 12:17 
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Joined: May 30th, 2005, 17:07
Posts: 443
Hi,
You can connect terminal...

Mikippp

a similar drive
Image


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 12:24 
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Joined: July 5th, 2007, 11:44
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Thanks Mikippp,
We will give that a try and post back.
:D

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John - http://www.dq-int.co.uk


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 21:25 
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Joined: December 16th, 2007, 10:26
Posts: 1151
it's possible connect it with DR pro tools 8)

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 21:31 
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Joined: February 25th, 2010, 21:57
Posts: 21
Location: China
Good to learn


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 1st, 2010, 21:32 
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Joined: February 25th, 2010, 21:57
Posts: 21
Location: China
Good to learn


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: April 2nd, 2010, 2:49 
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Joined: September 8th, 2009, 18:21
Posts: 9684
Location: Australia
Dataq wrote:
We have started seeing some of these Samsung 2.5" drives with only USB connectors on the PCB. No SATA or any other connectors. The one we have is a 500GB.

Has anyone been able to find points on the PCB to access the drive via SATA or terminal?

This URL ...

http://usbspeed.nirsoft.net/?pdesc=SAMS ... 1&pid=9001

... suggests that the USB-SATA bridge is a JMicron chip. The VID and PID are 152d and 2329, respectively.

Internet searches suggest that the bridge is a JM20239.

Here is an application circuit:
http://www.hxwtek.com/upload/jm20329_st ... 20open.pdf

The pinouts are:

21 RXP
22 RXN
25 TXN
26 TXP
39 UA1
40 UA0

Here are the locations of the SATA and RS232 Tx/Rx pins:
http://www.users.on.net/~fzabkar/temp/H ... serial.jpg

I don't understand the function of the UART pins, but I suspect they provide terminal access to the JMicron bridge chip.


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: June 15th, 2010, 20:50 
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Joined: June 15th, 2010, 20:43
Posts: 1
Location: slovakia
Please, do you happen to have one of these for sale. My friends HDD is still working but cant get through to the data ase USB connector from PCB was broken. I just need this PCB and I can save all the data. Can you help?

Dataq wrote:
I have attached some PCB photos.
Attachment:
IMG005.jpg

Attachment:
IMG003.jpg


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: June 16th, 2010, 3:30 
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Joined: September 8th, 2009, 18:21
Posts: 9684
Location: Australia
dpoloha wrote:
Please, do you happen to have one of these for sale. My friends HDD is still working but cant get through to the data ase USB connector from PCB was broken. I just need this PCB and I can save all the data. Can you help?

A straight board swap probably won't work. The Marvell chip (big "M") probably contains adaptive data that would need to be transferred from patient to donor.

The easiest solution would be to perform microsurgery on the connector.


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: September 22nd, 2010, 12:11 
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Joined: September 22nd, 2010, 12:08
Posts: 1
Location: NYC, USA
Was a solution ever found? Did the PCB swap work?


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 28th, 2011, 4:28 
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Joined: May 27th, 2011, 17:22
Posts: 3
Location: england UK
Hi
I have this hard disk and my USB connector has broken off.

Can someone direct me on how to hook up the sata points that are shown on one of the jpegs above?

hope you can help

Thanks


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 28th, 2011, 4:58 
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Joined: September 8th, 2009, 18:21
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Location: Australia
Connect the Rx and Tx points to a SATA connector according to the following pinout:
http://pinouts.ru/HD/serialATA_pinout.shtml

Remove the four coupling capacitors near the JMicron bridge chip.

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 29th, 2011, 7:03 
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Joined: May 27th, 2011, 17:22
Posts: 3
Location: england UK
Hi

Thank you for the reply.

I have opened up a sata cable and only seem to have 4 wires + ground, I assume these are the TX+- and RX+-.

Do I need to connect to the UA0 and UA1? What are they for?

Also do I need to provide power to the board - I can do this through USB as I have been able to solder those sections from a USB cable but cannot solder the other parts from the USB cable.

Thanks


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 29th, 2011, 18:12 
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Joined: September 8th, 2009, 18:21
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Location: Australia
UA0 and UA1 are probably UART I/O pins. They are not required for your purposes, but I suspect they provide debug access to the CPU inside the bridge chip, or perhaps they can be programmed for a user defined purpose (?).

Anyway, the Tx/Rx pairs are all you need for SATA access.

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 30th, 2011, 5:30 
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Joined: May 27th, 2011, 17:22
Posts: 3
Location: england UK
Hi

Thanks for the advice;

I nearly managed it, I had everything soldiered but the one wire TX- wouldn't solder, lifted track, tried to salvage, then had to move to chip pin ... eventually snapped the pin off chip. I can't get any contact to the chip for TX-.

So I guess this DIY has ended, although I could buy an identical and replace PCB, would this work, or can I make it work?


Can anyone recommend an external hdd (laptop hdd size) that has a strong USB connector, they could have put glue over the connector to make it stronger!? This is the second usb connector to snap on me in the last 2 years.



Thanky


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 30th, 2011, 6:18 
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Joined: September 8th, 2009, 18:21
Posts: 9684
Location: Australia
You could try a board swap. There seems to be some disagreement amongst the DR people as to whether Samsung drives need ROM transfers. I have seen threads, for other Samsung models, where a chip swap was required.

BTW, which chip did you damage? Could we see the result?

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 31st, 2011, 10:44 
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Joined: May 26th, 2011, 12:10
Posts: 49
Location: United Kingdom
Hi guys,

With regards to connecting to the terminal through the sata cables, is this sufficient enough to actually power the drive?

Basically, the USB connector has fallen off, and from what i gathered the best cause of action is to connect through the terminal pins on the PCB board.

I have stripped the wire, (2 R+- and T+- and ground) - the next step is .... :)

Cheers

Chris.


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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: May 31st, 2011, 19:42 
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Joined: September 8th, 2009, 18:21
Posts: 9684
Location: Australia
The best course of action is to engage someone to resolder the USB connector.

The drive needs to be powered from the USB +5V and ground pins.

The "terminal" pins alluded to by Mikippp are for diagnostic access via RS232, not data access.

If you are intent on pursuing a direct SATA connection, then you need to tap into the SATA Tx/Rx signal pairs (not RS232 Tx/Rx) that run between the JMicron bridge and the Marvell MCU. You can see them at the bottom right corner of this photo clip:

http://www.users.on.net/~fzabkar/temp/H ... serial.jpg

If you follow the signal traces back to the JMicron bridge IC, you will see two pairs of capacitors. You will need to remove them. Consult the JMicron reference circuit to identify the individual signals.

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 Post subject: Re: Samsung HM502JX USB Only?
PostPosted: February 22nd, 2012, 9:21 
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Joined: February 22nd, 2012, 9:12
Posts: 1
Location: United Kingdom
Can anyone update on whether replacing the PCB worked - I have the exact same issue. the usb connector broke, I have had it soldered back on but still not working, and I need my data, andyes, I know I should have backed it up! :(


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