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 Post subject: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 19:37 
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Joined: November 12th, 2018, 19:29
Posts: 5
Location: australia
Hey guys

So I wired up a China HDD docking station with the incorrect voltage.. wahoooo


can you guys please see attached and give me a direction on where to test the pcb and how to dodgey it up

I go alright with a soldering iron and a multi meter

Thanks smart people


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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 19:48 
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Most likely it's better to just replace the PCB with a known good one moving the ROM chip from the bad PCB to the donor compatible PCB.

And pray for the pre-amp to be ok ...

And DO NOT DAMAGE THE ROM CHIP otherwise it's bye-bye data for good ...

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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 20:11 
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Joined: November 12th, 2018, 19:29
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Location: australia
ooooo sounds riveting

So even if I get a donor pcb I still have to move a chip? which chip is the rom chip?

cheers budd


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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 21:30 
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The photo identifies the "BIOS" IC (aka "ROM").

https://www.hdd-parts.com/13022903.html
https://sep.yimg.com/ay/yhst-14437584971410/91711095-6.gif

Measure the voltages at the +5V and +5V(fused) test points. Also measure the resistances of the circled components.


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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 22:05 
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Joined: November 12th, 2018, 19:29
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Location: australia
looks like we found a busted fuse

jump it ? can i just solder over the top?

Thanks so much


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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 22:52 
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One of the diodes is shorted. You'll have to remove the TVS diode (the other would a Schottky rectifier). Can you tell us the part markings on each diode? I can see an "R" but nothing else.

Edit: I see that the other is an "A1".

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Last edited by fzabkar on November 12th, 2018, 22:56, edited 1 time in total.

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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 22:55 
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r and a1


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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 22:58 
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Location: Australia
RSA5M, Rohm, TVS diode, 200W, 5V, marking A1:
http://www.rohm.com/web/global/datasheet/RSA5M
http://www.1688eric.com/upload/pdf/2012 ... RSA5MG.pdf

Try removing A1. If the short goes away, then replace the fuse (or bridge it if you feel lucky).

I would test the PCB off the drive. Measure the voltages (V1 - 3) at each of the two inductors (near the TLS2601 motor controller, and the transistor.


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Last edited by fzabkar on November 12th, 2018, 23:08, edited 1 time in total.
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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 12th, 2018, 23:06 
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Joined: November 12th, 2018, 19:29
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Location: australia
Sir

You are my hero, ill let you know how it goes


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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 13th, 2018, 19:15 
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It might be "safer" to replace the entire PCB assuming you can move the ROM without damaging it ....

If you damaged the ROM chip is game over.

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 Post subject: Re: over powerd my board, help a numpty out
PostPosted: November 13th, 2018, 21:17 
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Joined: August 7th, 2015, 5:48
Posts: 41
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fzabkar wrote:
The photo identifies the "BIOS" IC (aka "ROM").

https://www.hdd-parts.com/13022903.html
https://sep.yimg.com/ay/yhst-14437584971410/91711095-6.gif

Measure the voltages at the +5V and +5V(fused) test points. Also measure the resistances of the circled components.


:D cool!


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