capacitor with no esr value

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  • 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
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