Need Advice on whether to suspect a bad capacitor

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • ebonk
    New Member
    • Sep 2006
    • 1
    #1

    Need Advice on whether to suspect a bad capacitor

    Just wondering if my computer's symptom could be caused by a bad capacitor.
    My Compaq 5102US with a UWAVE2 motherboard, PN 232148-002 always turns on and post just fine when turned on after being off for awhile. If the computer is turned off, and then the power button is depressed to turn the systom on, all we get is the cpu fan turning and the HD green light on constantly with no post. Then, if we turn it off for a number of hours, it will turn on and function properly. Once it is on and functioning, there is no problem what so ever until the next time we power off the unit. Help , comments please!
    Tags: None
    • UraBahn
      Scrapheap Hound
      • Nov 2004
      • 165
      • USA
      #2
      Re: Need Advice on whether to suspect a bad capacitor

      Could be a bad capacitor problem. Open the case and have a look at the caps on the motherboard (they look like little batteries standing perpendicular to the motherboard.) If you see any that are leaking crud out the top, look kind of domed or bulged on top, or are sitting at funny angles, then you've got badcaps.

      A bad power supply can also cause similar problems too.
      The ever-amazing (and ever-affordable) KY, Chemi-con's best kept secret.

      I'll probably be the only person going to SteamOS once it gets out of beta (ha ha.)

        Comment

        Previous template Next

        Related Topics

        Collapse
        • Prolog
          RTX 3080 FE Identifying capacitor
          by Prolog
          Hi people, I hope this is the correct spot to post this, I'm new to the forum.

          I have an RTX 3080 Founders Edition which has a burnt up capacitor (it was in parallel with another capacitor which appears damaged too), so I am hoping to be able to identify the capacitor values and order replacements.

          I hope these photos make it clear which component I am referring to:
          (yes, the soldering is a bit botched from removing the blown one, I know)

          I have found the board schematic (attached), but there does not seem to be a boardview available. I have never...
          12-01-2024, 08:27 PM
        • chth96
          If I replace with inferior capacitor, Is it No harm to other IC components at all?
          by chth96
          I replaced some capacitor which is located on optical pickup pcb which is shown in the table below(PCB #2).Because it have been out of order.
          Now,It works very well,But I just have found that all caps (6svpc100my and other part number as well) ,which is shown in the table below, has ultra-high ripple current spec.
          It is not able to obtain any capacitor which can be a substitute for this ultra-high ripple current nichicon capacitor.
          So I replaced it with samxon and rubycon's general capacitor(GP,YXA series).
          I know that these capacitor will not last as long as nichicon capacitor...
          12-22-2023, 04:34 AM
        • chth96
          How can I test non-polarized capacitor?
          by chth96
          I desoldered samwha NF capacitor(50v 5.6uf) from PCB circuit of 29inch CRT TV which have symptoms of no display after I heard sound of inrush of current to TV whenever I switch on this television.
          I measured ESR value of this non-polarized capacitor(samwha NF capacitor 50v 5.6uf) by means of MESR-100 ESR meter and It displayed 0.3 ohm

          And When I measured its capacitance with digital multimeter and LCR-T4 Mega328 meter, It displayed 10uf from DMM and 8uf from LCR-T4 meter.
          I found catalogue of samwha capacitor(samwha-catalogue_3.pdf file), which is attached to this thread,...
          06-02-2024, 07:31 PM
        • chth96
          Is it no harm to replace with capacitor without ripple current rating?
          by chth96
          When I tried to repair LG 29 inch CRT TV, I found that the ESR value of samyoung SMS capacitor(160v 2.2uf), which is very close to D1879 transistor, is 6 ohm.


          Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
          But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
          Rubycon YK DataSheet (b...
          04-19-2024, 05:19 AM
        • chth96
          Should I replace polymer capacitor?
          by chth96
          a few days ago I finally purchased mser-100 v2 and I tested its abillity of measuring ESR value.
          I found that It shows pretty accurate ESR value for electrolytic capacitor,But When I measure polymer capacitor of dreamcast game console,I found that one third of polymer capacitor's ESR value is more than twice the value of ESR meter table.(for example, I measured one polymer capacitor of 6.3v 100uf, It showed ESR value of 7.68)
          Although my dreamcast now turns 20 years old but it still works. I occasionally have played game with it.
          Is this ESR value of polymer capacitor correct?...
          11-18-2022, 04:22 AM
        • Loading...
        • No more items.
        Working...