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 Post subject: PCB Compatibility Question
PostPosted: January 16th, 2014, 11:58 
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Joined: August 30th, 2013, 12:17
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Location: United States
I need a board for a Samsung HD103UJ. They seem to be in short supply.....
I have sourced one with a slightly different family, will that work?

Samsung HD103UJ
BF41-00185A
TRINITY 32MB REV 4

I have found a board with the same number, but TRINITY 32MB REV 5, will that work?


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 Post subject: Re: PCB Compatibility Question
PostPosted: January 16th, 2014, 16:42 
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Joined: December 19th, 2006, 8:49
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Location: Portugal
What is the problem with the original PCB ? Do you see something toasted on it or the drive is not spinning and you assume the pcb is damaged ?
Do you have extrenal epperom programmer and a way to dump ROM on original PCB ?
If so and if drive not spinning with damaged pcb post ROM DUMP here.
Maybe you have damaged FIPS on ROM and pcb apears to be "dead" but if so it can be fixed/patched.

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 Post subject: Re: PCB Compatibility Question
PostPosted: January 16th, 2014, 18:21 
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The drive is not spinning, but using PC3K I can tell the board is not good.


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 Post subject: Re: PCB Compatibility Question
PostPosted: January 16th, 2014, 18:30 
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toooldforthiscrap wrote:
The drive is not spinning, but using PC3K I can tell the board is not good.


Do you have an externa programmer ? I would like to see the ROM from the damaged PCB.
Regards.

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 Post subject: Re: PCB Compatibility Question
PostPosted: January 16th, 2014, 19:28 
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toooldforthiscrap wrote:
The drive is not spinning, but using PC3K I can tell the board is not good.

ISTM that you have posted your question to the wrong forum. That said, what does PC3K tell you about the board?

Have you checked the TVS diodes?

Have you measured the onboard supply voltages (Vcore, Vio, Vneg)? If not, do you need help to do this?

Do you get any output from the serial terminal?

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 Post subject: Re: PCB Compatibility Question
PostPosted: January 16th, 2014, 21:04 
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fzabkar wrote:
ISTM that you have posted your question to the wrong forum. That said, what does PC3K tell you about the board?

Have you checked the TVS diodes?

Have you measured the onboard supply voltages (Vcore, Vio, Vneg)? If not, do you need help to do this?

Do you get any output from the serial terminal?


PC3K just remains busy. I took the two TVS diodes off one by one (as explained in the PC3K manual) but this didn't get me access to the drive. I would not know where to start on testing the supply voltages, but I know that you are the absolute guru when it comes to all things electrical :) Anything you can teach me would be much appreciated.


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 Post subject: Re: PCB Compatibility Question
PostPosted: January 17th, 2014, 4:15 
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Did you bother to check if the drive produced a log when connected by terminal ?
For me most likely ROM is damaged.
Good luck.

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 Post subject: Re: PCB Compatibility Question
PostPosted: January 17th, 2014, 11:23 
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Spildit wrote:
Did you bother to check if the drive produced a log when connected by terminal ?
For me most likely ROM is damaged.
Good luck.


It didn't produce a log, which again leads me to believe its a PCB (ROM) issue.


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 Post subject: Re: PCB Compatibility Question
PostPosted: January 17th, 2014, 15:41 
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Measure the voltages at the two 4R7 coils. These will be Vcore and Vio.

Then measure the voltage at the anode of the Schottky diode adjacent to the 1R2 coil. The anode is the pin facing toward the inside of the board. That will the negative supply for the preamp.

Did you measure the resistances of the TVS diodes before you removed them? If not, do you still have them, and can you measure their resistances now?

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 Post subject: Re: PCB Compatibility Question
PostPosted: January 17th, 2014, 18:02 
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With the Ammeter set at 20k, the resistance of the TVS diodes are 5.20 and 2.06.
Each time I power on the drive, it surges and takes my PC out.......


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 Post subject: Re: PCB Compatibility Question
PostPosted: January 17th, 2014, 19:01 
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The two TVS diodes are OK.

Measure the resistances across the 5V and 12V supplies at the drive's SATA power connector. Do this with the board on and off the drive.

Also measure the resistances between the two 4R7 coils and ground, and between the Schottky diode and ground. Perform the latter test with the board on and off the drive.

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