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rattlesnake
Senior Member
Last Activity: 11-22-2023, 03:56 PM
Joined: 12-17-2017
Location: Buenos Aires
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  • rattlesnake
    replied to Rate PAN STAR PSA-230P ATX v1.2
    in Troubleshooting Power Supplies and Power Supply Design
    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?...
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  • rattlesnake
    started a poll Rate PAN STAR PSA-230P ATX v1.2
    in Troubleshooting Power Supplies and Power Supply Design

    Rate PAN STAR PSA-230P ATX v1.2

    4
    Excellent!
    0%
    0
    Very good
    0%
    0
    Not bad at all
    0%
    3
    About average, ok
    0%
    1
    Cheap junk
    0%
    0
    Total garbage, throw it away
    0%
    0
    Hello 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?...
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  • rattlesnake
    replied to Samsung SyncMaster 955DF dim image fix
    in Troubleshooting Computer Displays
    Re: Samsung SyncMaster 955DF dim image fix

    Hey momaka! How are you, legend? I read on an [url=https://www.badcaps.net/forum/showthread.php?t=23728]old topic[/url] 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...
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  • rattlesnake
    started a topic Samsung SyncMaster 955DF dim image fix
    in Troubleshooting Computer Displays

    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...
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    Last edited by rattlesnake; 08-12-2023, 07:08 PM.
  • rattlesnake
    replied to Post help identifying capacitors here
    in General Capacitor Questions & Issues
    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 ...
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  • rattlesnake
    replied to Post help identifying capacitors here
    in General Capacitor Questions & Issues
    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...
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  • rattlesnake
    replied to Post help identifying capacitors here
    in General Capacitor Questions & Issues
    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....
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  • rattlesnake
    replied to Post help identifying capacitors here
    in General Capacitor Questions & Issues
    Re: Post help identifying capacitors here

    Beautiful, thanks again
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  • rattlesnake
    replied to Post help identifying capacitors here
    in General Capacitor Questions & Issues
    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?...
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  • rattlesnake
    replied to Post help identifying capacitors here
    in General Capacitor Questions & Issues
    Re: Post help identifying capacitors here

    Very small capacitor, is it 10v 16uF? What does the 9H2 mean?...
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  • rattlesnake
    replied to APM2054N MOSFET replacement for A9200SE
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
    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...
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  • rattlesnake
    started a topic APM2054N MOSFET replacement for A9200SE
    in Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals

    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 [URL="https://www.badcaps.net/forum/showthread.php?t=34815"]this post[/URL] 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...
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    Last edited by rattlesnake; 12-03-2022, 01:50 AM.
  • rattlesnake
    replied to Soyo SY-7VBA133U recap
    in General Capacitor Questions & Issues
    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...
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    Leave a comment:

  • rattlesnake
    started a topic Soyo SY-7VBA133U recap
    in General Capacitor Questions & Issues

    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)....
    See more | Go to post
    Last edited by rattlesnake; 04-10-2022, 07:23 AM.
  • rattlesnake
    replied to AC Adapter: blown capacitor, possible replacements
    in General Capacitor Questions & Issues
    Re: AC Adapter: blown capacitor, possible replacements

    You're right, my caliper was uncalibrated.
    real measures:

    6.3 mm wide
    14.8 mm tall
    See more | Go to post

    Leave a comment:

  • rattlesnake
    started a topic AC Adapter: blown capacitor, possible replacements
    in General Capacitor Questions & Issues

    AC Adapter: blown capacitor, possible replacements

    Hi folks,

    I'm repairing this old AC adapter and noticed it had a leaked cap, removed it, cleaned the surface (very nasty smelling) and now I'm trying to look for a replacement, but the values aren't quite standard or at least I don't have them readily available.

    Any suggestions or guidance? I like learning about this.
    Is there any chance to use a capacitor with a different value?

    Capacitor info:
    68uF 35V

    Size:
    20 mm tall
    11,4 mm wide

    I included some pictures. It seems the traces involving this capacitor had...
    See more | Go to post
    Last edited by rattlesnake; 02-17-2021, 07:48 PM.
  • rattlesnake
    replied to LG 23EA53 black screen after one second, it works after 5 minutes, high pitched sound
    in Troubleshooting Computer Displays
    Re: LG 23EA53 black screen after one second, it works after 5 minutes, high pitched s



    Thank you Ezequiel! I changed the two same value capacitors that had a high ESR value, then, replaced the PSU and... it works fine!
    I had to be careful with the flex cable because if it's not taped to the back of the LED panel tightly it shows artifacts in a strange green hue... gladly it got fixed upon using some scotch tape.

    Thanks everybody!...
    See more | Go to post

    Leave a comment:

  • rattlesnake
    started a topic FLATRON E1942 blinks on and off
    in Troubleshooting Computer Displays

    FLATRON E1942 blinks on and off

    Hello community,

    This monitor turns on and off very quickly upon connecting the AC adapter (tried two, tested 19v).

    I can see the LG logo on the screen for a split second, then turns off and on constantly in less than 1 second intervals. There's a high pitch noise while the stand by light/screen is on.

    I looked at the capacitors, only removed the big one
    1NBKJ
    33
    100V

    Measured it, it was fine. Anyway replaced it with a new one, and no luck.

    Just to test, unplugged the CCFL. Plugged the AC adapter....
    See more | Go to post
  • rattlesnake
    replied to LG 23EA53 black screen after one second, it works after 5 minutes, high pitched sound
    in Troubleshooting Computer Displays
    Re: LG 23EA53 black screen after one second, it works after 5 minutes, high pitched s

    I replaced the 100v capacitor with a new one (it took a while to arrive).
    It didn't make a difference. Actually, I ended up removing all caps to check them and all were in spec.
    Put them back on, nothing changed except now I don't get the screen working for a single second.
    There's this hissing noise, pretty intense.
    I removed all caps and turned it on, the noise is still there.
    I recorded it and amplified it, it's here:
    [url]https://vocaroo.com/i/s0J6krASxfBM[/url]...
    See more | Go to post
    Last edited by rattlesnake; 07-10-2019, 01:02 AM.

    Leave a comment:

  • rattlesnake
    started a topic LG 23EA53 black screen after one second, it works after 5 minutes, high pitched sound
    in Troubleshooting Computer Displays

    LG 23EA53 black screen after one second, it works after 5 minutes, high pitched sound

    Hello people,

    When I turn the monitor on I can see the image for a second, then the screen becomes all black.
    If I let it sit there and wait about 5 minutes, then I turn it off and back on again, it works normally.
    But there's a hissing sound all the time, very high pitched sound.

    I've been using this monitor for about 5 years.

    Due to all these signs I think this is a bad capacitor.

    I attach pictures of the PCB with the capacitors so you can judge and advice me what to do. Does any capacitor look bulged? Only (and slightly)...
    See more | Go to post
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