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Will someone please help me find these components

 
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chips2481



Joined: 11 Apr 2009
Posts: 6

PostPosted: Sat Apr 11, 2009 4:24 pm    Post subject: Will someone please help me find these components Reply with quote

I repair these power boards for laptops and it is a very simple circuit board with just 7 different components. I just replace the ac jack but I see a lot of them don't work even if the jack is replaced. I want to buy a bunch of all the components that are on the board but I have no idea how to find them. Could anyone help me out? Here is a picture, I can take a clearer one if you need it.
http://i227.photobucket.com/albums/dd228/chips2481/IMG00031-20090411-1100.jpg
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sun Apr 12, 2009 3:28 am    Post subject: Reply with quote

Rather than just replacing parts, why not figuring out what is causing the problem?
In looking at the pix, it is indeed simple.... C1-C5 are chip caps that very rarely cause any problem--if ever.
That leaves 3 other components.(beside the input jack & connector CN2)
Of course the fuse (F1) is the number one suspect (looks like a 5A surface mount). Try measuring it's physical size and search for it on the net. Probably Digikey or little fuse ought to have something similar.
R1 looks like a SMD power resistor that more than likely is ok (measure across it for value as a reference)
D1 is a standard SS34 schottky, 3A, 40v surface mount diode that unless shorted will not need replacing. (check it w/a diode test)
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PostPosted: Sun Apr 12, 2009 11:48 am    Post subject: Reply with quote

Turns out it was the fuse, I just soldered a wire from on end to the other and canceled out the fuse. I suppose it won't really matter since the power adapter has all sorts of short protection anyways. Thanks a lot for the help. I would assume any one I have seen of these that don't work would be the fuse. I looked around at little fuse and it is very confusing. The size is 3mm by 7mm, could you point it out for me?
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Sun Apr 12, 2009 6:37 pm    Post subject: Reply with quote

Anonymous wrote:
Turns out it was the fuse, I just soldered a wire from on end to the other and canceled out the fuse. I suppose it won't really matter since the power adapter has all sorts of short protection anyways. Thanks a lot for the help. I would assume any one I have seen of these that don't work would be the fuse. I looked around at little fuse and it is very confusing. The size is 3mm by 7mm, could you point it out for me?


It is never a good practice to override the fuse..sure it is the easiest route but you would NEVER want to jump the fuse with a piece of wire. It is there for a reason. In the event of an over current, no telling what it may burn up and you have definitely left your repair fingerprint.

Here is a similar one among many from Digikey.com If you spend the time and search for SMD fuse.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=F1190CT-ND
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chips2481



Joined: 11 Apr 2009
Posts: 6

PostPosted: Mon Apr 13, 2009 2:28 pm    Post subject: Reply with quote

Good point. I called digi key and they helped me find the parts. I also ordered some diodes since they were cheap. Luckily they are located in the same state I am so it should arrive quickly! I also sell these boards for a good price online but they are very hard to come by. It looks like a very simple board to make. Is it possible to buy a board that would be the same size or a board that I can cut to size myself and just etch the copper to be exactly the same and then just add the components and drill the holes needed?
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Mon Apr 13, 2009 5:42 pm    Post subject: Reply with quote

Board appears to be double-sided which will make the process you describe that much harder, but still possible.
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Mon Apr 13, 2009 6:12 pm    Post subject: Reply with quote

Anything is possible. A bit involved depending on your application.. I used to make PCB's and if you are equipped to do so, it is not that difficult but why bother going through the trouble if it can be repaired?

In comparison, unless you have a physically shattered unit, repairing such a simple pcb far outweighs the cost/process of making your own from scratch.
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PostPosted: Mon Apr 13, 2009 7:24 pm    Post subject: Reply with quote

Well I will repair the boards that people send to me but I want to sell working boards as well. It couldn't cost too much for the pcb would it? What equipment do I need to make them?
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vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Mon Apr 13, 2009 11:08 pm    Post subject: Reply with quote

First off you need a schematic. Raw PCB material that needs to be cut to the exact size, drawn up,silk screened, etched and drilled and finally all the needed parts soldered in.
If you are interested, there are tons of material on the net.... & google is your best friend.
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chips2481



Joined: 11 Apr 2009
Posts: 6

PostPosted: Tue Apr 14, 2009 1:46 pm    Post subject: Reply with quote

I watched a video using a photo etching process which seems possible, I also have a dremel I can use to drill the holes. I am having trouble finding the cn2 connector though, is there an easy way to figure out which one I need?
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