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what capacitor should I purchase for LCD display PCB?

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    what capacitor should I purchase for LCD display PCB?

    I want to fix Video door phone which works its doorbell but it is not able to display any screen.
    So I disassembled its plastic case and I detached FPC film cable from LCD display in order to inspect LCD display's PCB
    I measured ESR resistance of all smd capacitor on this PCB and I noticed that there is some SMD capacitor which has high ESR value(48ohm 50V 0.47uf,15 and 28 ohm 50v 3.3uf,10 and 8 ohm 35v 10uf)
    I desoldered this 5 suspicious SMD capacitor like below screenshot.
    images2.imgbox.com/51/b8/8WVZwDpV_o.jpg

    But I cannot identify specification of desoldered capacitors below screenshot. What capacitor should I purchase for LCD display's PCB?
    PMs5wh9v_o.jpg (2448×3264)
    Last edited by chth96; 05-24-2025, 10:59 PM.

    #2
    any caps higher than 1uf you can use any good low impedence cap like panasonic FR or rubycon ZLJ etc
    for 1uf or under it's not easy to find good electrolytics so use a polypropylene film cap

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      #3
      Is it possible to use KMG Series capacitor for over 1uf smd capacitor on LCD display's PCB?
      And As far as I know, polypropylene film cap is non-polarized. Is it possible to use 0.47uf non-polarized film cap instead of smd or dip 0.47uf polarized capacitor?

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        #4
        KMG is UCC's general purpose series... but even these should be better than bad caps with 5+ Ohms of ESR.
        Film caps (be it PP or PE) are pretty much always fine to use as replacements in places where low capacitance (under 1 uF) electrolytic caps resided before. Both PP and PE tend to have better high-frequency filtering than electrolytics do.

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