Re: Are those two caps bad?
Here we are!
Last week I desoldered those damn Sacon caps from the video board, and replaced them with Panasonic caps.
The PC is running fine since then, and the message "The video card is not receiving sufficient power" does NOT appear anymore!
I deduce all went ok.
Thanks to all of you.
See you next time, bye bye.
ResistEnt
Member
Last Activity: 03-26-2021, 12:55 AM
Joined: 05-05-2015
Location: Udin
-
Re: Are those two caps bad?
Good news!
I soldered the new caps and the mains connector, now the PSU is up and running
I first attached it to the wall plug, turned the back switch to the "I" position and measured the +5VSB voltage. Weirdly, it was below 3V and wasn't stable at all.
Then, I attached some loads (one HDD, one DVD player and one DVD burner) and remeasured the +5VSB voltage: it now was stable and equal to 5.05V.
I short-circuited the PS_ON signal and the PSU started. I measured all voltage rails...Leave a comment:
-
Re: Are those two caps bad?
I soldered the new caps in.
Apart from the too high temperature of the tip (I don't have a temp-controlled iron) and the consequent carbonized flux residues I removed from the board, the joints look good to me and also the soldering process was quite straightforward.
But before replacing the PCB in its case and solder the mains connector, I checked the voltage filter outputs for possible short circuits.
I found just 20 ohms between the ground and 3.3V, is this normal?
Leave a comment:
-
Re: Are those two caps bad?
Wow, very quick reply!
1000uF is a Rubycon ZLJ.
1500uF is a Panasonic FR type A.
2200uF is a Rubycon YXH.
Ok so the point is "steel", not "stainless"
Leave a comment:
-
Re: Are those two caps bad?
Finally,
with the next week I should be able to do the soldering job.
I still have three more questions for you.
[list=1][*]+12V output filter cap, it was a single capacitor of 1000uF ESR 39mOhm.
You told me to replace that one with a 3300uF, but unfortunately I haven't found a perfect replacement from Distrelec. The order is done, I have all caps at home and of course I'd like to avoid placing a new order (mainly for shipment taxes). For the doubt, I bought all these possible replacements:
(a) 1000uF ESR 38mOhm...Leave a comment:
-
Re: Are those two caps bad?
Uff guys the time runs too fast!
Still very busy and unable to proceed atm...
Anyway I ordered from Distrelec, capacitors are now at home
I had to choose some caps different from what I wrote above, since Distrelec wasn't selling them, but I stayed on known brands (Rubycon, Nichicon and Panasonic). Now I just have to do the work.
I'll let you know as soon as I'll find the time to make it.
Meanwhile, I take the opportunity to thank again all of you who supported me.
Bye.Leave a comment:
-
Re: Are those two caps bad?
Ok so what about this?
[color=blue][b]YXH 2200uF 10V 10x28mm, ripple 1910mA, ESR 31mOhm[/b][/color].
Thanks for suggestions.Re: Are those two caps bad?
Ok so what about this?
[color=blue][b]YXH 2200uF 10V 10x28mm, ripple 1910mA, ESR 31mOhm[/b][/color].
Thanks for suggestions.Re: Are those two caps bad?
Ok so what about this?
[color=blue][b]YXH 2200uF 10V 10x28mm, ripple 1910mA, ESR 31mOhm[/b][/color].
Thanks for...Leave a comment:
-
Re: Are those two caps bad?
Ok guys, I've had some problems to desolder the caps, I bet there's something wrong I make while doing it.
I use a 40W soldering iron with a quite thin tip, and the first thing I noticed is that when I touch the solder on the PCB, it does not melt, no matter how long I stay with the tip on it.
So I put a small amount of solder directly on the tip, and this way I manage to melt the solder but only for certain points.
For other ones, I have to put fresh solder also on the joint itself, to make the old solder...Leave a comment:
-
Re: Are those two caps bad?
Hi.
Here is the updated list.[list=1][*]-5/-12V output filter caps, they were 2x [b]470uF 16V 8x15mm, ripple 800mA, ESR 85 or 93mOhm[/b], replacement: [color=blue][b]ZLJ 470uF 16V 8x11.5mm, ripple 1200mA, ESR 75mOhm[/b][/color];[*]+5VSB critical cap, it was [b]22uF 50V 5x11mm, ripple 75mA, ESR unreported[/b], replacement: [color=blue][b]YXH 22uF 50V 5x11mm, ripple 180mA, ESR 700mOhm[/b][/color];[*]+5VSB output filter caps, they were 2x [b]1000uF 10V 8x20mm, ripple 1100mA, ESR 50 or 65mOhm[/b], replacement: [color=blue][b]ZLJ 1000uF 10V...Leave a comment:
-
Re: Are those two caps bad?
I can definitely confirm.
I reposted your pic with the voltage rail of each coil.
So you're suggesting me to desolder all output filter caps and replace them with the values you said above, right?
Last question before I do that:
as you said before, it looks like there's no cap greater than 1000uF.
If I replace them with 2200, 3300, ..., but the PSU doesn't accept the new values, what might happen?
Caps may explode, or the entire PSU, or the entire motherboard, or simply nothing powers up, or what...Leave a comment:
-
Re: Are those two caps bad?
P.S.: yeah, I read and downloaded the desoldering FAQ by Willawake
Now it's all about practicing!Leave a comment:
-
Re: Are those two caps bad?
Okie thanks for your post.
I'll check it as soon as I can, don't know if I'll do it tomorrow.
But my guess about your guess is you're right, what you marked as "coils" are actually coils and, for the C-L-C filter, I remember to have seen something like that this morning, about the cap below the desoldered cap.
I'll let you know, bye.Leave a comment:
-
Re: Are those two caps bad?
Ok for 120Hz/100kHz.
Ok for leakage current.
Thanks for suggestion about the difficulty of soldering on mobos and gfx cards, I figured it out. I've an old MB I'd be happy to destroy lol
The extra cap looks directly connected to orange wires.
The bulged cap is directly connected to the blue wire (-12V?).
To orange wires seems also connected the cap below the extra cap (see pic 3 from the above post), but not directly.
Looking at the same picture, the capacitor partially hidden by orange...Leave a comment:
-
Re: Are those two caps bad?
Thanks all for the information,
and sorry for my late reply but I've been quite busy these days.
Needless to say the PSU is still open on my desk and caps haven't been ordered yet lol
Anyway, I managed to have a look at some Rubycon datasheets and I took into account these parameters for my choice:[list][*] capacitance, I tried to stay to the original values because I really don't know which parts of the PCB can see a different capacitance value and which can't;[*] working voltage, not necessarily the same as the original...Leave a comment:
-
Re: Are those two caps bad?
Hi.
@goodpsusearch: I removed all the caps you suggested me.
I also removed the cap in attachment because it was the only one that wasn't "in touch" with the PCB. So I thought: if it's not in touch, even if it appears good to the top, maybe it started to bulge to the bottom since it has room to do that.
All other caps are in touch with the PCB, so I'm assuming if they look good they're also good (at least, for now).
@SteveNielsen: trivial question, to correctly measure a resistance I have to...Leave a comment:
-
Re: Are those two caps bad?
Hi again.
I got good news and bad news.
Good news:[LIST][*]I completely removed the glue between components[*]I managed to desolder the mains connector[*]this way, I have been able to remove the PCB from its case[*]I desoldered the bulged capacitor[/LIST]
The bulged capacitor is a 470uF 16V G-Luxon cap, and G-Luxon is the brand of most of the caps that are soldered on the PSU.
It's bulged either on the top and the bottom sides.
Now the bad news:[LIST][*]while I was removing the glue, I...Leave a comment:
-
Re: Are those two caps bad?
Ah yeah ben7, by the way, I forgot to mention that the graphics card was the last upgrade I did to that PC.
So it was the newer component, the only component which is not 12yo...
Damn Sacon...Leave a comment:
-
Re: Are those two caps bad?
Thanks again for all your replies!
Let's analyze some things.
The PC that PSU is feeding is a 12yo PC as I already said.
I've used it all the time since I bought it, it was definitely my "daily life PC": music, photos, surfing the Internet, and also playing 3D games. In short, it's been stressed very much, it's been switched on for many many hours (about 15 hours a day for the last two years) and, probby for the reason goodpsusearch stated above, the PSU has incredibly lasted.
Ah yeah, at this...Leave a comment:
-
Re: Are those two caps bad?
Guys, I've some news.
First, I've managed to remove that brown glue (see attachments).
To never have put my hands on jobs like this, I'm pretty satisfied about the result
goodpsusearch, I also attached some other photos about the PSU, including its labeling.
I inspected the PCB accurately from either the components side and the traces side, and found no components burnt, no leaks, and no weird odds, just dust
that I've blown away.
But actually there's one small capacitor with...Leave a comment:
-
Re: Are those two caps bad?
Well all the stuff is 12yo, not only the PSU!
CPU is an AMD Athlon XP 2200+ not overclocked (it runs at 1800MHz).
Graphics card is an NVIDIA GeForce 7600GS, AGP 8x model.
Wow goodpsusearch...
I posted four badly-taken photos and you told me the power of the PSU and also answered to a forgotten question I asked myself years ago... it's an active-PFC or passive-PFC PSU? Cool!!Leave a comment:
No activity results to display
Leave a comment: