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Old 24 September 2008, 07:55   #1
lennonlives
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Dead CD32 mainboard - repair possible? Help me, please.

Hello there,

one of my CD32 mainboards died a few days ago Suddenly the lights went out and it smelt really bad. As far as I can tell, an SMD capacitor has burnt. I'm no good at electronics so I'm not sure if this is indeed the cause for the console not to work anymore and if it can be fixed. I've attached pictures. The capacitor in question (C6A) is right below the kickrom, on the lower side of the mainboard. Otherwise, the mainboard looks just fine to me.

It'd be great if you could tell me if the mainboard should be fine if I had that capacitor replaced in an electronics shop or if there might be another root to my problem.

Many thanks,

Florian
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Last edited by lennonlives; 24 September 2008 at 08:03.
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Old 24 September 2008, 08:15   #2
Vars191
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C6A is a decoupling capacitor, just remove it and it should start working.
It looks as you might be able to lift one end slightly or just cut in half
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Old 24 September 2008, 08:52   #3
lennonlives
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So you say it'll work without that capacitor? Why was it there in the first place? As I said, I have no clue about electronics. I do have a standard soldering iron. I can try removing it.
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Old 24 September 2008, 09:03   #4
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Because http://en.wikipedia.org/wiki/Decoupling_capacitor
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Old 24 September 2008, 09:03   #5
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I will try and explain, the capacitor is for filtering high frequency from the power going to the digital chips, there are many of these capacitors on the board so it will not affect the operation of the CD32 if one is missing
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Old 24 September 2008, 09:15   #6
lennonlives
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Thanks, that way even I get it

So, I was preparing to desolder that capacitor, but I didn't get that far. Touching it with my bare finger it just came off. The board underneath doesn't look good to me. What do you reckon?
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Old 24 September 2008, 09:21   #7
Vars191
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No problems first very carefully clean the airier and then give me another photo, is it burnt
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Old 24 September 2008, 09:24   #8
lennonlives
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It looks burnt to me. I tried cleaning it with some alcohol to no real success. No visual improvement. However, I just hooked the mainboard up and powered it on. It works! You're a genius, man Thanks so much!!

In case you have any further ideas how to clean up that mess, shoot me
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Old 24 September 2008, 09:32   #9
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use some nail varnish on the damaged airier

Last edited by Vars191; 24 September 2008 at 09:41.
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Old 24 September 2008, 13:10   #10
alexh
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Quote:
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use some nail varnish on the damaged airier
Clear nail varnish is recommended, but Aqua Marine is a good shade as is Crimson Red
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Old 24 September 2008, 13:15   #11
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Just don't use a metallic shade, LOL
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Old 24 September 2008, 14:25   #12
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looking at the pics, it looks a little more complicated than just removing it.

From what i can see there is a bonding of the underlying track to the pols of the decoupling cap. From the picture one of the decoupling polls doesn't seem to be making proper contact either so a small blob of solder would work there.

I would suggest first removing the solder with solder wick / braid and flux, then you will know what you will need to do, you may have to run a small length of 30AWG wire from the bottom pin in the picture.... okay....

done a pic instead... try and follow the attached image.

good luck
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Old 24 September 2008, 14:38   #13
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If it works, I recommend ignoring Zetro and putting the lid on an never opening it again. The danger of poor use of the soldering iron is probably too great.
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Old 24 September 2008, 14:50   #14
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If it works, I recommend ignoring Zetro and putting the lid on an never opening it again. The danger of poor use of the soldering iron is probably too great.

But if your CD32 fails to operate in the future then the first area to check would be the one Zetro has outlined above for you.

TC
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Old 24 September 2008, 16:08   #15
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Great pic

I'll give it a shot and report back
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Old 24 September 2008, 16:12   #16
lennonlives
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Clear nail varnish is recommended, but Aqua Marine is a good shade as is Crimson Red
LOL
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