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Re: Jonny Guru + Caps
my first guess would be too low ESR (or too high? well probably not.. but certainly not the same as those fuhjyyus and capxons)
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Re: Jonny Guru + Caps
I know this was discussed either here or on Jonnyguru's forums before.
I have not looked up the specs of the capacitors used but it would be my guess that they ventured too far from the originals specifications.
The capacitors and inductors in a PSU form a filter, so called "Pi Filter".
Thus the capacitors and the inductors (which is what the Pi Filter is) must be matched.
So ESR, Ripple and Capacitance is choosen according to the size of the inductors...
P.S: Inductors are often referred to as "Coils" aswell"The one who says it cannot be done should never interrupt the one who is doing it."Comment
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Re: Jonny Guru + Caps
I was always of the opinion that something else had changed when JG did that. My reason was, the waveforms are really whacked compared to the originals.
I could understand/agree with the change in ESR causing the screwy waveforms, -if- the waveforms looked like the originals, only "bigger". These look like something is inducing interference into the signal. Like a bad scope probe or frayed (or too long) ground braid...?
He does say that the testing was done "in two phases several weeks apart"...?
I've used all FM's to recap units and not had that kind of result. [Antec]
I will try using HZ's when I get a unit I think deserves them
, just to see.
Could this be more due to poor(ly made) inductors than caps?
Need a plug-n-play PSU with a selection of components to swap in and out to really be sure.
Toast
EDIT: Afterthought... Fluorescent light fixture electronic ballast in lab causing the extraneous "noise". I've had that experience and now do some low level testing with them off and just incandescent bulbs for lighting.Last edited by Toasty; 04-29-2011, 08:55 AM.veritas odium paritComment
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Re: Jonny Guru + Caps
Per Hansson's got it right.
- And now you have an example via o'scope of why I harp on matching specs.
It's on page 1.
He (it was Oklahoma Wolf) used KZE and KY which aren't even close to the ESR/Ripple of some of the original caps.
He didn't even check the specs on the old ones. [I asked him.]
He just went with Jap caps...
- - And in the process changed the frequency response of the pi circuits.
.
Note that it was done 4 years ago.
What he did was standard practice 4 years ago. (Every place except BCN that is.)
It's STILL standard practice/advice in most places.
WE MUST TEACH THE WORLD!!
[Okay, that's silly...]
.
.Last edited by PCBONEZ; 04-29-2011, 08:52 AM.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: Jonny Guru + Caps
KZE and KY vs. fuhjyyu TMR and TNR and Capxon KF (from what i can see)Comment
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Re: Jonny Guru + Caps
I was wondering why he was using such crappy caps to begin with, UCC wouldn't be my first chose, I would have gone with Panasonic or Nichicon. If he had gone with those maybe the results would be different?Comment
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Re: Jonny Guru + Caps
UCC is not a crappy brand, they make great caps.
Just because they have been bitten by a bad series (KZG) does not mean they do not make good caps.
Hell if we stopped using caps from manufacturers that have never created duds we would have an extremely limited supply!"The one who says it cannot be done should never interrupt the one who is doing it."Comment
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Re: Jonny Guru + Caps
I agree with Toast, looks like extraneous interference on the scope. Bad ground or probe.36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....Comment
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Re: Jonny Guru + Caps
Read the article in detail and you will see he states he does not have a ESR meter so he has no clue if the caps he put in are good (yes even new ones can be bad). My first guess would be a bad cap got put in.Comment
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Re: Jonny Guru + Caps
Does anyone have the Fuhjyyu TMR / TNR datasheets?
The only ones I see now on their site are TM / TN.
Mad_P - {fwiw} Generally high to lower (not good to bad, mind you):
P-FM, U-KZE, N-HE, U-KY, P-FC
when looking at the same value and can size.
It also depends on how sharp a point you want on your pencil.
You can drive yourself nuts over milliohms and 10's of milliamps of difference. What it comes down to when you choose caps for a project/repair is: which ones are "close enough" then "who has them and at what price?"
Toastveritas odium paritComment
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Re: Jonny Guru + Caps
TM = TMR
TN = TNR
The R is a marketing thing.
I think it may mean custom ordered size.
The TMR 4700uF/10v that came out of the TP-II(s) I did were 10mm x 40mm I think.
Maybe it was 10x35mm, but anyway, the actual size was longer than the data sheet.
[Same with the 3300uF/16v.]Last edited by PCBONEZ; 04-29-2011, 01:30 PM.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: Jonny Guru + Caps
Okay. Sleeve colors TMR/TNR don't match the new(er) sheets.veritas odium paritComment
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Re: Jonny Guru + Caps
I think jonnyguru probably knows how to use a scope.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: Jonny Guru + Caps
From what I can tell the sheets they have on-line match those I have on file which are older than that little experiment.
TM are blue.
TN are black.
Either that or I dunno what you are looking at...
.Last edited by PCBONEZ; 04-29-2011, 01:49 PM.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: Jonny Guru + Caps
Appears they didn't do a full recap too.
If I remember right that TN is on +5vsb.
.Attached FilesMann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: Jonny Guru + Caps
http://www.fuhjyyu.com.tw/pro.htm
TM at far right column shows "Royal Brown".
TN is black as was TNR.
The TN, IIRC, is on the -12v in, then the Little (magnifiers everyone over 40) coil behind it, then the KY/KZE to the Blue wire.veritas odium paritComment
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Re: Jonny Guru + Caps
Yet photo in actual data sheet is Royal Blue.
I think maybe that's a typo.
Not sure though, I -may- have seen brown ones at some point.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
Comment
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Re: Jonny Guru + Caps
Yeah, never heard of that color. The last Royal Brown was followed by a flushing sound...veritas odium paritComment
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Re: Jonny Guru + Caps
There IS a band called Royal Brown,,,, perhaps they sound like sh*t.
.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Normally, I never post repairs this quick after I do them, because… I am usually very slow. But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though.
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
This one should make @Pentium4 smile
(if he is still reading BCN forums) – I got a new old stock / open box Casing Power MPT-301 PSU on eBay for $4 total. 
Yes, it’s a very generic-looking box, but the manufacturer isn’t (at least not back in the days), which is…
Macron Power Technology Co. LTD.
Let’s look at the PSU itself.
The shell/case also appears quite generic, like many “sold-with-the-PC-case” units. However, the shell is well-formed and has decent steel thickness. In terms of... -
I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
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