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martyyn

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#92950 9-Nov-2011 21:13
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I just got myself a Dell 19" 931BW in with a whole load of bits and pieces but it wont power on.

Google tells me its more than likely just a capacitor which has blown, but replacing that sort of thing is a little out of my league.

Does anyone know of somewhere in Wellington I could get this looked at and hopefully repaired ?

Cheers
 

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martyyn

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  #543344 9-Nov-2011 21:21
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Ive obviously checked google for places to go to, I was hoping someone might have a recommendation for work they may have had done. I dont fancy spending $70 to find out it cant be fixed.

Unless of course someone is a dab hand at this and fancies some beer in return ;)

Niel
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  #543429 10-Nov-2011 05:55
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I would do it if you were in Auckland. Those type of faults are usually easy and common. I've bought a Dell 15" for next to nothing and fixed it. Somewhat hard to open, but easy to fix. Capacitors dry out, very common.




You can never have enough Volvos!


 
 
 
 


martyyn

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  #543665 10-Nov-2011 14:01
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Thanks Niel,

I may just give it a bash myself, Ive got nothing to lose really. Its been 25 years since I picked up a soldering iron in anger but it may be worth a crack.

mattwnz
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  #543753 10-Nov-2011 15:02
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martyyn: I just got myself a Dell 19" 931BW in with a whole load of bits and pieces but it wont power on.

Google tells me its more than likely just a capacitor which has blown, but replacing that sort of thing is a little out of my league.

Does anyone know of somewhere in Wellington I could get this looked at and hopefully repaired ?

Cheers
?


Are you sure it is a dell? That code brings up samsung for me.
Anyway I picked up a dell 19 inch ex lease monitor from oneof these second hand computer recycling places for $25 and in full working order, so I don't think they are worth repairing, unless you can do it yourself.

martyyn

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  #543758 10-Nov-2011 15:07
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Stupid me, yes its a Samsung !

I got it with a couple of boxes of computer bits and pieces for a pittance, so Im only interested in fixing it if it will cost pennies/beer. Which is why Im thinking of just ripping it open and having a crack myself. I have nothing to lose.



mattwnz
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  #543774 10-Nov-2011 15:21
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martyyn: Stupid me, yes its a Samsung !

I got it with a couple of boxes of computer bits and pieces for a pittance, so Im only interested in fixing it if it will cost pennies/beer. Which is why Im thinking of just ripping it open and having a crack myself. I have nothing to lose.




There is probably no harm opening it up, and looking at the boards to see if you can see anything visible that has blown. Capacitors can give you an electric shock, so be careful.

Niel
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  #543880 10-Nov-2011 18:09
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Only the large fat mains capacitor might give you a shock, but it will self discharge in a minute or so.

Run your finger over the top of capacitors. If you are bulged up, they need replacement. Should be perfectly flat. Slight hint of bulge will still work, but clear bulge will not. The issue is usually finding the right value replacement.

If you find a bad cap you could mail the PCB to me and I can fix it for you (might just first have to check I can get the value in the same size can, some are not common). I've used a soldering iron for 25 years, comes with being an electronic engineer...




You can never have enough Volvos!


 
 
 
 


martyyn

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  #544131 11-Nov-2011 09:17
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Wow, thanks for the offer Niel.

Ill take it apart this weekend and will let you know how I get on.


martyyn

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  #544554 12-Nov-2011 12:28
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Well that looks simple enough. It took me longer to work out how to get the board out than it did to fire up the soldering iron and remove the blown capacitor. Its a Capxon 1000uf 16v and judging by google its rather common on the Samsungs.

Im off down to Jaycar to get another one and will chuck it in and cross my fingers :)

Niel
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  #544572 12-Nov-2011 13:20
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You need to ask for a low impedance capacitor for a power supply, not the stock standard ones. Let me know if you want me to mail one to you.




You can never have enough Volvos!


martyyn

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  #544575 12-Nov-2011 13:33
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Just back from Jaycar, the bloke was great. When I asked where to find them, he asked what I had and what I needed it for and gave me the low ESR one. Just waiting for the iron to heat up and hopefully it will all work again.

 

vinnieg
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  #544576 12-Nov-2011 13:35
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Niel: You need to ask for a low impedance capacitor for a power supply, not the stock standard ones. Let me know if you want me to mail one to you.


Yeah Niel is right, get the black ones, not the blue ones


Also, if they don't have 1000uf in stock, get 1200 or 1500/1600uf in place of it

I know last time I was at Jaycar in Wellington they had run out of all 1000uf ones 




I have moved across the ditch.  Now residing in Melbourne as a VOIP/Video Technical Trainer/Engineer. 

martyyn

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  #544577 12-Nov-2011 13:38
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What Ive ended up with are green just like the original. I picked the black one originally and they said it wasnt low ESR and I should be using one of the green ones.

It says 1000uf, 16v, +105C LOW ESR written on it, which matches the one I took out, although now I have them side by side the new one is a little taller
 

martyyn

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  #544582 12-Nov-2011 14:06
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After some of the worst solder joints in living memory, five minutes to put back together, then open it again to put in the screws Id forgotten and its all going again :)

Thanks for your help gang, Im stoked to have gotten it going again so easily and cheaply.


Niel
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  #544676 12-Nov-2011 19:25
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Taller is usually lower ESR (equivalent series resistance), but naturally not that simple. The guys at Jaycar know electronics, the shop is owned by Soanar who is one of the large electronic component importers.

105 degree C is what is normally used for power supplies as they can run hot.

Glad you got sorted, so many good products get dumped due to a blown 15c capacitor (Jaycar probably charged you a bit more than 15c...).




You can never have enough Volvos!


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