Two displays need recapping, need assistances.

**retiredcaps** · 02-06-2011, 10:40 PM

Re: Two displays need recapping, need assistances.

1) For future posts, please post 1 monitor per thread. Keeping track of 2 different in 1 thread is hard to follow.

2) For future posts, please post clear focused pictures of your boards using the manage attachment button. Please do not post inline.

3) Replace ALL your capacitors except the largest one which rarely, but not never, fails.

4) Capxon has less than a stellar reputation with this forum here -> thus the recommendation above.

5) If you live in the USA, you can order caps from digikey.com Pick Panasonic FR, FM, and FC (in that order). So if your cap is 1000uF 25V, go to digikey.com and search

1000uF 25V FR

That should narrow down the choice to 1 or 2 listings. Make sure the caps are the right diameter and height for your board. If FR is not available, do same search for FM. If FM is not available, do same search for FC.

6) Regarding the slightly bulged caps, I love how Toasty puts it at

https://www.badcaps.net/forum/showpo...88&postcount=6

**PlainBill** · 02-07-2011, 07:17 AM

Re: Two displays need recapping, need assistances.

I like it when the poster notes the maximum height, as you did.

As far as the caps you selected, they should work. I haven't verified dimensions. You should do that before you order, or you can do what I have done on several memorable occasions and verify the fit when you install the new caps.

What is missing from the list are one or two small (less than 100 uF) caps around the SMPS controller. They typically cost about $.30 each. They will fail with no visible signs. When they do, the power supply won't start. I replace them as a matter of routine.

PlainBill

**retiredcaps** · 02-07-2011, 11:57 AM

Re: Two displays need recapping, need assistances.

Originally posted by Mad_Professor

I'm ordering from digikey, but I'm totally confuse about ESR, I don't know how to read digikeys interpretation of ESR.

ESR = impedance

For
http://search.digikey.com/scripts/Dk...name=P14424-ND

ESR = 20 milli ohm = impedance

**Mad_Professor** · 02-07-2011, 07:33 PM

Re: Two displays need recapping, need assistances.

Originally posted by PlainBill

What is missing from the list are one or two small (less than 100 uF) caps around the SMPS controller. They typically cost about $.30 each. They will fail with no visible signs. When they do, the power supply won't start. I replace them as a matter of routine.

You mean the 22uF 50v and 47uF 50v, yeah I have those.

There's one 22uF 50v on the viewsonic board but I don't think I can't remove it since on back side there are abunch of resistors all around the solder points, I have needlepoint soldering iron but my skill is not that good.

On the samsung board, I have 50v 22uF and 47uF but there's one more but the glue they use to hold it in place was excessive and surprisingly difficult to remove, so I couldn't remove the glue. I can't find out what voltage or microfarad it needs. It's a GL c707 rated 105C, and not the same as the 22uF which is c716. I'm hoping some one will recognize it.

Originally posted by retiredcaps

ESR = impedance

For
http://search.digikey.com/scripts/Dk...name=P14424-ND

ESR = 20 milli ohm = impedance

So low mOhm and high ripple, Correct?

**retiredcaps** · 02-07-2011, 10:36 PM

Re: Two displays need recapping, need assistances.

PCBONEZ explains it best here

https://www.badcaps.net/forum/showpo...30&postcount=7

**Mad_Professor** · 02-08-2011, 03:02 AM

Re: Two displays need recapping, need assistances.

It says here that

ESR and Ripple change with the can size and the series. - Not uF or volts.

So if I get a replacement capacitor that is a different size say, the bad one was 13x20 and the new one is 10x20, would I have a problem?

or

if I have one that was 8x8 and the new one was 8x16, would this cause problems?

assuming if I couldn't get esr rating for them and only the ripple, which capxon datasheets only contains size and ripple nothing, about impedance except the max rating for the series.

**retiredcaps** · 02-08-2011, 10:28 AM

Re: Two displays need recapping, need assistances.

Originally posted by Mad_Professor

So if I get a replacement capacitor that is a different size say, the bad one was 13x20 and the new one is 10x20, would I have a problem?

or

if I have one that was 8x8 and the new one was 8x16, would this cause problems?

Some cap manufacturers are better at producing caps than others. So manufacturer "A" could produce a 10x20mm cap that has better ESR and ripple than manufacturer "B's" 13x20mm cap.

assuming if I couldn't get esr rating for them and only the ripple, which capxon datasheets only contains size and ripple nothing, about impedance except the max rating for the series.

The Panasonic FR and FM series generally far exceeds the Capxon caps in terms for ESR and ripple. I'm guessing the Panasonic FC and Capxon are probably similar in terms of ESR and ripple.

**PlainBill** · 02-08-2011, 11:17 AM

Re: Two displays need recapping, need assistances.

Don't confuse the package, the specifications, and quality. Let's say you are working on a faulty two year old monitor. You pull a 680uF, 16V 10mmx20mm Capxon with a bulged top. It was spec'd at .04 ohms ESR, 1A ripple current. You find a seller on eBay who will sell the identical Capxon caps.

One statement I've seen here is "I've never had to replace a bad Panasonic cap". Panasonic has a 680uF, 16V cap spec'd at .03 ohms ESR, 1.2A ripple current. It measures 10mm x 25mm. That is a great substitute PROVIDED there is room for the higher cap. It would be fine if it were smaller than the original. Go with the high quality part.

One other point. Don't get hung up on matching specs. The .04 ESR spec of the Capxon was a 'better than' spec. Capxon guaranteed that the cap's ESR would be below .04 ohms if the cap was operated at 105°C, 1A ripple current for 2000 hours. Initially it probably was below .02 ohms. But monitor power supplies are 'ON' whenever the monitor is plugged in. They are drawing less power, but still active. So that 2000 hours is less than 3 months. Even at reduced temperature and current the original had an ESR below .04 for less than 10,000 hours.

PlainBill

**Mad_Professor** · 02-08-2011, 11:47 AM

Re: Two displays need recapping, need assistances.

Ok I get the general idea. As long it meets or exceeds the previous specifications or requirements of a board and fits in the allotted space it should be ok.

I think I got enough info here to place my order since I have double checked and triple checked and I seem satisfy with my cart, I also have 22uF, 47uF, and 2.2uF Panasonic fm and fc caps added for the samsung board.

I'll keep this thread updated, I wish a had a decent camera to take a quality shot of the boards in question.

**retiredcaps** · 02-08-2011, 11:53 AM

Re: Two displays need recapping, need assistances.

Originally posted by Mad_Professor

As long it meets or exceeds the previous specifications or requirements of a board and fits in the allotted space it should be ok.

Yes.

I wish a had a decent camera to take a quality shot of the boards in question.

Post pics after the repair using manage attachments. For best quality, you needs lots of indirect sunlight and macro mode. That will produce clear focused pictures.

**Mad_Professor** · 02-09-2011, 02:48 AM

Re: Two displays need recapping, need assistances.

Awww damn it, Panasonic FR 820uF 25v that had 10mm x 20mm are sold out. FM and FC are 10mm x 25mm which would come in contact with metal casing of the LCD structure. I did wide search of 25v to 50v and didn't find anything 10mm x 20mm.

I could probably curve the leads on a 25mm for two of the caps but there are three more clustered together and the diameter is critical there, so is height.

**Mad_Professor** · 02-09-2011, 03:28 AM

Re: Two displays need recapping, need assistances.

Update:

I had a random no name KZG 3300uF 6.3v that measured 10mm x 24mm. Using it as a reference, with the power board in it looks like I have maybe 1-2mm of clearance and where the caps sit, there's a white plastic pad mounted on the lcd metal casing.

You think I have chance with a 10mm x 25mm FM cap? I can always put in set of washers to give it a small lift.

**PlainBill** · 02-09-2011, 07:20 AM

Re: Two displays need recapping, need assistances.

Originally posted by Mad_Professor

Update:

I had a random no name KZG 3300uF 6.3v that measured 10mm x 24mm. Using it as a reference, with the power board in it looks like I have maybe 1-2mm of clearance and where the caps sit, there's a white plastic pad mounted on the lcd metal casing.

You think I have chance with a 10mm x 25mm FM cap? I can always put in set of washers to give it a small lift.

I'd give it a try. That KZG cap was undoubtably listed as 25mm high.

PlainBill

**retiredcaps** · 02-09-2011, 11:31 AM

Re: Two displays need recapping, need assistances.

Originally posted by Mad_Professor

FM and FC are 10mm x 25mm

Hmm, FC shows 12.5x20.00mm at

http://search.digikey.com/scripts/Dk...name=P11222-ND

**Mad_Professor** · 02-09-2011, 04:52 PM

Re: Two displays need recapping, need assistances.

Originally posted by retiredcaps

Hmm, FC shows 12.5x20.00mm at

http://search.digikey.com/scripts/Dk...name=P11222-ND

2.50mm too fat, might work for two caps that are spaced apart but when it comes to the 3 cap cluster, I would be having to force it to fit, and there's not any room to curve it due to transformer and heatsink surrounding the cluster. The caps are surrounding what looks like a vertical coil with a rubber insulator to protect it self from the caps , and they are all located on corner edge of the board.

edit:
Now I'm screwed...

1000uF 25v FR series sold out no alternatives unless I go down 16v

**Mad_Professor** · 02-09-2011, 05:52 PM

Re: Two displays need recapping, need assistances.

Going for 25mm FR! I place the viewsonic board in, then used the kzg 25mm cap as reference, then placed the housing on top and shine a light through the holes and with the leads it's 28mm and it touches the top of the hosuing. I assume I can use a 25mm with 2mm of space to breath. I'm ordering this stuff now before other stuff run out of stock.

**jetadm123** · 02-09-2011, 05:55 PM

Re: Two displays need recapping, need assistances.

Originally posted by Mad_Professor

2.50mm too fat, might work for two caps that are spaced apart but when it comes to the 3 cap cluster, I would be having to force it to fit, and there's not any room to curve it due to transformer and heatsink surrounding the cluster. The caps are surrounding what looks like a vertical coil with a rubber insulator to protect it self from the caps , and they are all located on corner edge of the board.

edit:
Now I'm screwed...

1000uF 25v FR series sold out no alternatives unless I go down 16v

Here's a thought. Are the cluster of caps in parallel? In other words, are 2 or 3 of the cap's "+" leads connected to the same pad on the circuit board? For example, let's say all 3 caps in your cluster are 820uf and connected in parallel. Total capacitance is 820uf x 3 caps = 2460uf. You could in turn use 2 1000uf and 1 470uf cap, which gives you 2470uf. The difference here is that the 1000uf and 470uf caps are more readily available in a multitude of heights and diameters because they are more of a "standard" value.

**Scenic** · 02-09-2011, 05:56 PM

Re: Two displays need recapping, need assistances.

measure the voltage or look for voltages on the silkscreen and trace them back to the caps?

i've had quite a few monitors with 25V caps on the 12V rail (where 16V ones would be perfectly fine..)
same thing for 16V caps being on 5V

**Mad_Professor** · 02-09-2011, 06:43 PM

Re: Two displays need recapping, need assistances.

Originally posted by jetadm123

Here's a thought. Are the cluster of caps in parallel? In other words, are 2 or 3 of the cap's "+" leads connected to the same pad on the circuit board? For example, let's say all 3 caps in your cluster are 820uf and connected in parallel. Total capacitance is 820uf x 3 caps = 2460uf. You could in turn use 2 1000uf and 1 470uf cap, which gives you 2470uf. The difference here is that the 1000uf and 470uf caps are more readily available in a multitude of heights and diameters because they are more of a "standard" value.

Looking at, it does look like it's in parallel. Description below.

Originally posted by Scenic

measure the voltage or look for voltages on the silkscreen and trace them back to the caps?

i've had quite a few monitors with 25V caps on the 12V rail (where 16V ones would be perfectly fine..)
same thing for 16V caps being on 5V

c111, c114, c112, "+" are on the same pad, c113 "+" is on a different pad going to R113, all "-" for 111,2,3,4 are on the same pad. There is a bridge 111,114,112 going to c113 to r113 trace. which terminates at cn2 for logic board, it says 13.5v.
The Cap for c113 is 25v 330uf.

I already placed the order. I'm pretty confident I can fit the caps. I'll try one cap and see if it fits, if it doesn't fit then I'll order different ones.

Two displays need recapping, need assistances.

Two displays need recapping, need assistances.

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