NAS drive

[TheDragon]

Hi all needs some help please.

I have a NAS drive which has stopped working. I've been told that the 3.3v rails can go on the board and to replace them, and been told to replace all other caps too as they are probably nearing their end of life.

I have researched a fair amount but with so many different Brands/series for similar rated caps, I'm stumped.

The original caps are : 330uF 16v 105oC VLSOM - (H)8MM W(8MM) X 8

100uF 16v 105oC STONE - (8)8MM W(6MM) X 7

From my viewpoint the height is most important for clearance of the HDD drives. The width can be accommodated.

Thank you in advance. Btw - I have a another question posted regarding a motherboard if you could take a look please).

[momaka]

Re: NAS drive

Post a picture of the board - by far the easiest way for us to see what you are seeing and suggest a troubleshooting route.

[goontron]

Re: NAS drive

post pics of everything.

[TheDragon]

Re: NAS drive

Photo's would make it easier. I do hope these help somewhat.

[TheDragon]

Re: NAS drive

Post a picture of the board - by far the easiest way for us to see what you are seeing and suggest a troubleshooting route.

post pics of everything.

Sorry, I should have multi-quoted with the photos.

Thanks guys for looking.

[momaka]

Re: NAS drive

Great photos.
Yeah, looks like the caps could be the issue as there appear to be two buck regulator circuits, and those don't function too well with bad caps. I don't see anything else potentially wrong.

The VLSOM caps appear like typical cheap garbage, so probably best to replace them. Stone are known to fail all the time here (usually in Routers, Modems, and some cheap TVs).

You didn't indicate what country you are from, so I will assume USA and post Digikey links. If you are from somewhere else, please say so, so that we can post links of suppliers relevant to your country.

For the VLSOM 16V 330 uF caps, these could work:
http://www.digikey.com/product-detai...616-ND/3528478

And for the 16V 100 uF Stone caps:
http://www.digikey.com/product-detai...302-ND/4204139

The only reason I suggested polymer capacitors above is because they are a little bit smaller and easier to find (electrolytic caps are usually big, unless they are made as a custom order, such was probably the case with yours). Polymers caps are a bit more expensive though. I don't know how much the NAS drive enclosure is worth, so use your judgement and let me know. If it's cheap, I can look for some cheaper capacitors.

*edit*
Never mind about the polymer capacitors being more expensive than regular electrolytic.

[TheDragon]

Re: NAS drive

Thank you momaka for the guidance. My apologies, I'm from the UK.

The NAS is a few years old and has been running 24/7, and was about $150. So, not too much, but because it has been reliable, I thought a repair if financially viable would be good and saving wasting electronics and me some money

I had a look at the links you supplied and google'd UK suppliers.
The United Chemi-Con is somewhat hard to find, so if possible an alternative?
I have found the panny one but your link says 180uf versions, where as the original are a 100uf. Is that correct or is that because they're polymers?

much appreciated.

Now if someone knew as much as you for my panny cinema system....

[momaka]

Re: NAS drive

RS Components (uk.rs-online.com) would probably be where you need to look at then (but I did that already, so I'll provide you the links ). Also, just to mention this for the future reference - avoid eBay when it comes to capacitors, especially any that come from China. There are only a handful of reputable sellers that sell good caps. The rest sell counterfeit or generic junk that is no good.

I have found the panny one but your link says 180uf versions, where as the original are a 100uf. Is that correct or is that because they're polymers?

For very small capacitors (around 100 uF), you can usually go up in capacitance up to two times as it is almost never an issue. On search engines, I specify the capacitance I need and several capacitance sizes up (so for 100 uF, I also pick 120 uF, 150 uF, 180 uF, and even 220 uF). Then I sort by price. Sometimes, the odd sizes such as 120 uF and 150 uF could be cheaper (and this does happen quite a bit on Mouser.com) due to lower demand. As long as those bigger capacitance caps also fit the width and height requirements, I usually go for the slightly increasaed capacitance. Besides, electrolytic capacitors have a +/-20 tolerance on most specifications, so it's not critical you pick the exact same replacement in most cases.

So anyways, enough yapping from me. Time for some links for the replacement caps.

For the 16V 100 uF, any of these should work (sorted by price), so whatever is in stock:
http://uk.rs-online.com/web/p/alumin...itors/5194059/
http://uk.rs-online.com/web/p/alumin...itors/7396812/
http://uk.rs-online.com/web/p/alumin...itors/7152549/
http://uk.rs-online.com/web/p/alumin...itors/7152552/
http://uk.rs-online.com/web/p/alumin...itors/7396816/
http://uk.rs-online.com/web/p/alumin...itors/5261430/
Just a note that most of these are 6.3 mm wide and 11 mm tall (a very standard size for those voltages and capacities - almost anything else would have to be custom order or polymer). Since your height requirement is 7 mm, you may have to lay these sideways on the board and solder them like that instead. It won't be an issue, though (in terms of circuit functions).

As for the 16V 330 uF caps, this is what I found:
http://uk.rs-online.com/web/p/alumin...itors/7955528/
^ that one is the only one I could find that fits your 8x8 mm dimension requirements and would be an almost exact replacement. The lower capacity shouldn't be a problem since it is a polymer. Do note the price, though.
If you do have a few millimeters of extra height (for a total height of 12 mm), then you have a lot more choices:
http://uk.rs-online.com/web/p/alumin...itors/7497155/
http://uk.rs-online.com/web/p/alumin...itors/5261339/
http://uk.rs-online.com/web/p/alumin...itors/7083706/
http://uk.rs-online.com/web/p/alumin...itors/7083620/

Also note that many of these capacitors on RS Components come in a pack of 5 or 10 (although I see your board has quite a few small caps, so it seems that won't be an issue for you).

Now if someone knew as much as you for my panny cinema system....

Hehe, thank you!
If you have a thread on it, I probably will eventually look at it.

[TheDragon]

Re: NAS drive

Wow momaka, You are very thorough in your feedback and links. I truly appreciate the effort. Plus I get a lesson in basic electronics. win win

OK, I will now check the prices and delivery costs and and will place an order.
I will keep you posted on what I have ordered and when I have done the job of swapping out the caps.
Hopefully this is one device I can save thanks to your knowledge

Thanks once again

only 2 more items to fix lol

[momaka]

Re: NAS drive

You're welcome.

And yeah, definitely keeps us posted what happens, regardless if it's a success or failure (and if it's a failure, we can always troubleshoot it further).
It's threads like these that could save many many dead NAS drivers like yours. So feedback is always appreciated.

That said, do you have a make and model number of the NAS drive enclosure? It would be very useful when people search for this on Google.

[TheDragon]

Re: NAS drive

You're welcome.

And yeah, definitely keeps us posted what happens, regardless if it's a success or failure (and if it's a failure, we can always troubleshoot it further).
It's threads like these that could save many many dead NAS drivers like yours. So feedback is always appreciated.

That said, do you have a make and model number of the NAS drive enclosure? It would be very useful when people search for this on Google.

I ordered these:

Panasonic FM Radial 100μF 25 V dc Through Hole Aluminium Electrolytic Capacitor ±20%

Panasonic FR Radial 470μF 16 V dc Through Hole Aluminium Electrolytic Capacitor ±20%

Will pick them up from the store.

The NAS is not a professional version, and has been discontinued now I think (I have a QNAP for pro purposes). This was used predominantly for music and file streaming.

Model MRT 35HD-DUAL-NAS-E.
http://mrt.nas-central.org/wiki/Cate...5HD-DUAL-NAS-E

Turned out to be a decent device for the price. It ran 24/7 since 2008.

Anyway thanks again. Keep you updated with repairs.

[TheDragon]

Re: NAS drive

You're welcome.

And yeah, definitely keeps us posted what happens, regardless if it's a success or failure (and if it's a failure, we can always troubleshoot it further).
It's threads like these that could save many many dead NAS drivers like yours. So feedback is always appreciated.

That said, do you have a make and model number of the NAS drive enclosure? It would be very useful when people search for this on Google.

Quick Update to this one:

I have re-capped the unit. And thanks to your guidance, the NAS is running fine. Is their anything I should do before keeping it on? Or are caps ok to just use to straight away?

If its ok could I pick your brain an interject a different technical question please.
I have a component which I am uncertain of it's characteristics and I'm not sure whether the datasheet I have found is correct considering the different markings on the component itself.
It is a diode breed but what type, I am unsure of. I have uploaded a photo of the component and what I assume is it's datasheet. The actual part is in a Panasonic cinema system and the service manual lists it as a regulator diode and rectifier elsewhere in the same manual, and I'm confused as to what the datasheet says and it's use.

If it is indeed a dual diode then my meter readings, say one side to be .453 and the other to be .200. according to the research the .200 would mean its a fail? And to be fair, I don't understand the datasheet too much to substantiate that.

As you can tell, I'm an amateur in electronics but like to explore.

The datasheet : https://cdn.badcaps-static.com/pdfs/...d3a767a955.pdf
Panasonic part number : B0HBSM000054

Appreciate the help

[stj]

Re: NAS drive

are you metering it on the board or removed?

[TheDragon]

Re: NAS drive

are you metering it on the board or removed?

hi, I metered it removed.

[momaka]

Re: NAS drive

Quick Update to this one:

I have re-capped the unit. And thanks to your guidance, the NAS is running fine. Is their anything I should do before keeping it on? Or are caps ok to just use to straight away?

That's great to hear! Congrats!
No, no need to do anything (there is no "break-in" procedure or period with electronics). Just plug and chug .

I have a component which I am uncertain of it's characteristics and I'm not sure whether the datasheet I have found is correct considering the different markings on the component itself.

Can you post pictures from the top and bottom sides of the board? (actually, if you do that, I suggest you start a new thread with the device and model # in the title so that more people can find it and reply.)
I believe the datasheet you found is likely correct, but it doesn't specify whether it is a common-cathode dual rectifier or not. So that reading you got on the multimeter may or may not be right for that component.
All I can conclude is that if it is a dual-rectifier, then one side is likely bad.

Try measuring the resistance between the middle pin and two outer pins and see what you get. If you get a low resistance (200-300 Ohms or less), then that could be a bad or leaky rectifier.

[TheDragon]

Re: NAS drive

That's great to hear! Congrats!
No, no need to do anything (there is no "break-in" procedure or period with electronics). Just plug and chug .


Can you post pictures from the top and bottom sides of the board? (actually, if you do that, I suggest you start a new thread with the device and model # in the title so that more people can find it and reply.)
I believe the datasheet you found is likely correct, but it doesn't specify whether it is a common-cathode dual rectifier or not. So that reading you got on the multimeter may or may not be right for that component.
All I can conclude is that if it is a dual-rectifier, then one side is likely bad.

Try measuring the resistance between the middle pin and two outer pins and see what you get. If you get a low resistance (200-300 Ohms or less), then that could be a bad or leaky rectifier.

Sorry for the late reply, been very very busy.

Yep, the NAS has been running for about 2 weeks. and works fine with no errors etc, so thanks again.


The other problem with Panasonic unit, I had started a post:

https://www.badcaps.net/forum/showth...d=1#post523391

I've applied my limited knowledge on that problem and have possibly given up give the outcome that has been advised and cost that maybe involved in professional repair.

I seemed to be having a electronic extravaganza these last few weeks. My Pioneer CAR stereo has also now stopped working. And though it is old by todays standards, it had good clean quality sound and will post up a thread to see if I could repair it. let the fun (stress) ensue.