Hey that's great news!
I'm glad you found the right values and that it's working fine now.
rattlesnake
Senior Member
Last Activity: 06-14-2026, 08:23 PM
Joined: 12-17-2017
Location: Buenos Aires
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It's been a while... finally I'm back to this project.
I removed all the electrolytic capacitors, here are all the measurements:
Near the diode bridge
JPCON 470µF 200v 340x220mm - 332.3µF 0.00Ω - Replace?
JPCON 470µF 200v 340x220mm - 355.4µF 0.00Ω - Replace?
Are these ok?
The one above the EEL-16-2 transformer:
JPCON 22µF 35v 11x5mm - 25.9µF .96Ω - Replace
This must be the 5VSB capacitor.
According to Momaka's recommendation, it's better to replace this one as it's 15% off.
The other two above EEL-16-1...Leave a comment:
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Hello Fred...
I already fixed it.
Coils were fine. I checked every electrolytic capacitor. I checked the VRM transistors, the buck converter IC (HIP6004). I couldn't detect any failure. I even replaced the transistors just in case. Then close to the edge of the board I noticed a missing SMD cap "C718". It can be seen in the pictures I attached. So I started figuring out how the circuit works as far as I could. I removed and measured some capacitors that were already in circuit and added one of a similar value (0.1µF).
And violà, like magic, the...Leave a comment:
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Voltage issues SY-5SSM, where's the problem? Help needed
Hello everyone,
I'm trying to fix this SY-5SSM motherboard (Socket 7).
When the PSU is connected it powers on by itself but there's nothing on the POST card, no beeps.
The BIOS EEPROM is ok (latest BIOS was flashed).
All the jumpers are set ok.
All the 1000µF 6.3v (14) and 1500µF 16v (2) caps are in spec.
There are two 76129D MOSFETs (datasheet). I took them out and tested them and they are ok (no continuity from drain to source) in off state.
But the voltage in the gate of the second 76129D fluctuates between 1.468-1.649,... -
Here's what I found out.
I was mistaken about this particular PSU. It turns out that I get artifacts with all my AT PSUs, but with one they are only barely noticeable.
I changed to a different CRT monitor and I don't see the artifacts. An LCD doesn't show them either.
So it must be either the motherboard or the CRT itself.
The CRT is a DELL E773c.
Next: I tested all the tantalum capacitors (most are 10µF 16v) on the motherboard and they were fine, capacitance around 11µF, ESR around 1-2 ohm. But the single electrolytic capacitor (330µF...Leave a comment:
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AT PSU produces video artifacts
I recently put together a retro build that uses a particular AT PSU that fits in this case (LPX).
The model is HPN-100. I'm attaching pictures.
The issue is that after a few seconds of being on, I start to get strange artifacts. The image looks wavy. First it's fine and then it starts to pick up. After about 60 seconds it looks like this:
Does anybody know what kind of failure this is?
Can the caps be faulty? Which ones should I put more emphasis on?
What's the potentiometer for? What else should I check?
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Re: Rate PAN STAR PSA-230P ATX v1.2
Thank you for your replies!
I'll definitely check them and report back.
Aren't new caps sometimes rated, let's say 470uF, and when you measure them they're 500uF, or 550uF? I thought that there was a -/+ 15-20% tolerance. Even reading some datasheets I think I read they say that values are within a certain %.
Would you please tell me which one is the 5VSB primary capacitor? is it near the transformers?
And just for curiosity, what would get fried first?
...
Leave a comment:
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Rate PAN STAR PSA-230P ATX v1.2
5Excellent!0%0Very good0%0Not bad at all80.00%4About average, ok20.00%1Cheap junk0%0Total garbage, throw it away0%0Hello everybody,
I picked up this PSU almost for free and I'm thinking it could be suitable for an old system (Pentium/K6-2/P-III). It's quite heavy, so that's always good.
What do you think about its components and overall quality?... -
Re: Samsung SyncMaster 955DF dim image fix
Hey momaka! How are you, legend? I read on an old topic that you had this monitor and was hoping that you could help.
I finally disassembled it, took many precautions, including pushing down the power button for several seconds and discharging the anode with a screwdriver + cable and an alligator clip to the chassis. It didn't make any noises or sparks at all. I repeated the process many times with a hand behind my back. Nothing. I discovered that the tip of the screwdriver had some sort of grease that comes from suction...Leave a comment:
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Samsung SyncMaster 955DF dim image fix
This display looks a bit dim but the image is otherwise fine. I already set the contrast to 100 and the brightness to 50 (more than that is counterproductive, it becomes hazy).
To enable extra tuning, I have to enable the "Highlight Zone" function and stretch it to full screen. That way it looks really bright/intense and really good! I wish I could set it permanently like this, but as soon as you change the display mode/resolution or you turn the monitor off, you lose the "Highlight zone" config and you have to manuallly activate it again. Also, the manual says...Last edited by rattlesnake; 08-12-2023, 07:08 PM. -
Re: Post help identifying capacitors here
That's very detailed, thank you very much!
I couldn't find this datasheet on Google. Did you look for it on a specific website or did you already know LF was related to Nichicon? Any more tips would be appreciated.
About the ripple current, for computer motherboards, computer PCI cards, etc, is lower ripple the most desirable? I mean, doesn't that give you a cleaner signal?
Is ripple always related to height? more height = higher ripple?
Thanks for bearing with ...Leave a comment:
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Re: Post help identifying capacitors here
" LF 680 e 672 " (e or 0?)
I think this one is 680uF but what is the voltage? And how do you guess? Diameter is 7.8mm...Leave a comment:
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Re: Post help identifying capacitors here
I thought so! But I wasn't familiar with all the values you described. Thank you for taking the time to enumerate them all. I'm sure I'll come back to this post some day....Leave a comment:
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Re: Post help identifying capacitors here
Beautiful, thanks againLeave a comment:
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Re: Post help identifying capacitors here
Thank you
Does the "s" in "16s" mean volts? otherwise how can you tell what is what? I mean could there be a 10v 16uF cap? how would you tell them apart?...Leave a comment:
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Re: Post help identifying capacitors here
Very small capacitor, is it 10v 16uF? What does the 9H2 mean?...Leave a comment:
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Re: APM2054N MOSFET replacement for A9200SE
Thanks for your suggestion. Have you read my message? Please do so.
This is a theoretical question.
I read the datasheet for the mentioned MOSFETs but I don't know enough to interpret them fully.
That's why I ask, what are the conditions that should be met to replace a MOSFET with a different one?
I read that voltage can go up, and resistance can go down, but I don't feel confident with only that. I think there probably are other factors and I'd like to know more about...Leave a comment:
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APM2054N MOSFET replacement for A9200SE
Hello folks,
I accidentally shorted something on this video card, and the APM2054N MOSFET got visible burned (image attached, though it is not so clear in the picture). I can't find the exact replacement but I have sourced two of each of these: APM2509N, APM2506N, APM2512N from my pile of broken electronics.
Reading this post and checking the datasheets, all the ones I found seem to be compatible (lower resistance, higher voltage) but I'm not sure at all. Overall I see the ones I found are for higher load and higher voltage.
Can anybody please tell...Last edited by rattlesnake; 12-03-2022, 01:50 AM. -
Re: Soyo SY-7VBA133U recap
Thank you everybody for your help.
I did a very delicate recapping job.
The sad news is that the motherboard doesn't work. Some component could have been damaged when I powered it on back when I found it (it already had bulged caps). Although I barely tested it. Or maybe someone discarded it back then because it was already damaged.
I got it to post once and it only showed "BIOS checksum error"
Which is false, because I manually programmed the eeprom with the latest BIOS.
Anyway...Leave a comment:
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Soyo SY-7VBA133U recap
Hi guys,
I'm going to recap this baby. I found it dumped in the street years ago, and now it's time has come. I remember having tested it and it posted back then.
Original caps are bulged and look nasty. All are SACON
11 x 1000uF 10v
12 x 1500uF 10v
1 x 470uF 16v
11 x 22uF 25v
1 x 10uF 25v
The smaller ones look fine. Should I replace them too?
I read on another forum that I could replace the 1500uF caps with 2200uF caps. Is that so?
The thing is I could get Sanyo 2200uF or Capxon 1500uF (or Jackon 1500uF)....Last edited by rattlesnake; 04-10-2022, 07:23 AM.
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