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Almighty1
Badcaps Veteran
Last Activity: Today, 07:20 PM
Joined: 04-23-2014
Location: San Francisco, California
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  • If you look at the photo at the top, the motherboard does not actually have a hole on the other side. The photo on the right is just the bottom of the piece which I am calling the standoff that came out. If there was a hole on the otherside of the motherboard, it's obvious that it can be soldered on the other side. Backside photo means backside or bottom of the standoff, not backside of motherboard. I didn't realize the standoff actually had a hole that made it to the other side as I only briefly looked at it and kept it in a safe place so I will not lose it. But basically I want to put the piece...
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    Last edited by Almighty1; 06-21-2024, 02:00 AM.

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  • The screw hole unless you meant the motherboard where H55 is not the issue as remember the solder needs to go on the bottom of the standoff and the top of H55 on the motherboard which is the solder joint but there is no way to get the soldering iron between the two parts as those are the parts that need to be joined together so do you mean to put flux on the top of the motherboard but how will I get the solder so it it does not not go outside the diameters of the standoff?...
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    Last edited by Almighty1; 06-19-2024, 01:43 AM.

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  • How to remount this?

    I was fixing my notebook/laptop computer and the motherboard/mainboard/systemboard standoff which is for securing the bracket that also holds the fan fell off. I would like to know what I can use to re-attach it to the
    mainboard/motherboard/system board. It seems to be some kind of electrical conducting adhesive as it has continuity when I tested the dried out adhesive as it is probably used to ground. Does anyone know where
    I can buy the electrical conducting adhesive online that is strong? Failing that, will first melting solder on the bottom of the standoff first and then position...
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  • How to remount this standoff ?

    I was fixing my notebook/laptop computer and the motherboard/mainboard/systemboard standoff which is for securing the bracket that also holds the fan fell off. I would like to know what I can use to re-attach it to the
    mainboard/motherboard/system board. It seems to be some kind of electrical conducting adhesive as it has continuity when I tested the dried out adhesive as it is probably used to ground. Does anyone know where
    I can buy the electrical conducting adhesive online that is strong? Failing that, will first melting solder on the bottom of the standoff first and then position...
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  • Re: Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendatio

    Just a update, I went with the following as replacements:

    For the Chengx® 100uF 25V 0.25"/6.35mm Wx0.3125"/7.9375mm H:
    Panasonic FR EEU-FR1V101 35VDC Tolerance: -+20%, 6000Hrs@105C, Ripple Current 950mA@100kHz, Impedance 0.056@20C 100kHz

    For the YST 10uF 50V 0.1875"/4.7625mm Wx0.4375"/11.1125mm H:
    Panasonic FR EEU-FR1H100 50V Tolerance: -+20%, 5000Hrs@105C, Ripple Current 250mA@100kHz, Impedance 0.340@20C 100kHz

    Photos:...
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    Last edited by Almighty1; 06-26-2023, 06:01 AM.

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  • Re: Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendatio

    Looks like I can fit up to 15mm in height as that is the tallest component being the RJ-11/RJ-45 jacks which still leaves a bit of room.

    Also found some Panasonic FR series candidates:
    For the 100uF 25V 0.25"/6.35mm Wx0.3125"/7.9375mm H:
    Panasonic EEU-FR1V101 35VDC Tolerance: -+20%, 6000Hrs@105C, Ripple Current 950mA@100kHz, Impedance 0.056@20C 100kHz $0.72
    [url]https://www.mouser.com/ProductDetail/Panasonic/EEU-FR1V101?qs=tfZGHB2PWd1LosiJY3G7%252Bg%3D%3D[/url]...
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  • Re: Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendatio

    After some research, it seems my options are:

    For the 100uF 25V 0.25"/6.35mm Wx0.3125"/7.9375mm H:
    None exist with the 6.35mm diameter W so increasing the height to 11mm
    1) Nichicon UPW1E101MED 25V Tolerance: -+20%, 5000Hrs@105C, Ripple Current 290mA@100kHz, Impedance 0.25@20C 100kHz/0.50@-10C 100kHz $0.37
    [url]https://www.digikey.com/en/products/detail/nichicon/UPW1E101MED/589561[/url]
    2) Nichicon UKT1E101MED for Audio 25V Tolerance: -+20%, 1000Hrs@105C,...
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  • Re: Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendatio

    I basically measured it with a metal ruler from the top of the board but the capacitors are not seated all the way so it's leveled and a bit angled. I'm compiling a list now of the different Japanese caps available and see what I can come up with.
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    Last edited by Almighty1; 04-23-2023, 10:19 PM.

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  • Re: Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendatio

    @Iti - Thanks for your input. Where is it usually marked "low ESR", is it actually on the capacitor physically itself since it's hard to find the spec sheets as it is hard to even know what series they came from. It seems like if I am only buying 2 caps, the cost of shipping will probably be high so might as well spend a little more to get what I can as long as it's a small amount more. If there isn't enough room for the height as it seems to have 0.5" of height space and some space...
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    Last edited by Almighty1; 04-23-2023, 05:42 PM.

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  • Re: Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendatio

    Thanks for your reply. Any specific candidates you would recommend as I have no idea how those are used and when using Digikey and Mouser, there are a lot of choices, not even sure how each series ranks in each brand even for the Japanese brands. Not sure what the impedance on the original parts are either. The power supply itself is actually a plug-in wall adapter as the input is already 12VDC at the point the power adapter connects to the unit.
    Someone did a teardown of the device here:...
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    Last edited by Almighty1; 04-22-2023, 05:32 PM.

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  • Polycom formerly Obihai Obi202 VoIP Adapter - Capacitor Replacement Recommendations

    Greetings everyone:

    I have a Polycom formerly Obihai Obi202 VoIP Adapter which has the following 2 capacitors:
    1 x ChengX 100uF 25V 0.25"Wx0.3125"H
    1 x YST 10uF 50V 0.1875"Wx0.4375"H

    What are suitable replacements that are long life and rated 105C or higher? Am I correct that the uF has to match but the voltage can be the same or higher? Are there any advantages and disadvantages if it's higher than the original voltage?

    Thanks!
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    Last edited by Almighty1; 04-22-2023, 05:06 AM.

  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    I looked again and basically the Rubycon capacitors still have pins within the size of the capacitors width but just don't seat physically close to the circuit board because it would be touching the Samxon capacitor's body so they raised it but spacing of the pins shouldn't matter because remember on capacitors other than the Samxon, the leads are longer than the spacing so it can handle wider or narrower spacing without issues.
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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter



    The pin spacing shouldn't matter since on the Rubycon caps, the pins are actually slightly wider than the caps. Not to mention, if I took out the caps which also are inside some adhesive, I would not remember which cap where which is why I prefer to take out one cap and put in one, one at a time. As long as the width of the cap fits and the height of the cap does not exceed 25.4mm on any of the caps, it will fit. I can see the Chemi-Con KY being a candidate for #3, #5, and #6 while Panasonic FR for...
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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    Remember the capacitor is still installed so it cannot be measured that accurate, it can only go where my 1 ft metal ruler can fit but it is 30mm wide but 27mm in height.
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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    I knew I forgot something and basically there is one cap I forgot too. The measurements for #3 is actually bigger as this one is deep in the bottom and I can't get the ruler in so I used something else to get a approximate measurement and made the number slightly bigger.

    Capacitors are as follows (maximum height is 1" for any capacitor replacement as there is a shield that sits on top before the chassis.
    1) 105c 180uF 450v SAMXON HP 27mm H x 30mm W
    2) 130c 220uF 25v Rubycon RX30 14mm...
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    Last edited by Almighty1; 07-23-2017, 08:10 PM.

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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    No idea on the height of the others except I know the #1 is almost 1" in height since that is the highest that can be used before the metal shield goes on top. All of these caps basically are the round Aluminum Electrolytic type that has two wires on the bottom of the cap. All of them are small except #1 is big. Can't get the measurements since I would have to desolder everything first which I rather do when I replace it.
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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    I know but I just want to know what are good replacements since I have 3 of these power supplies so might as well pick up the caps in case the other ones fail too. Besides, I'm going to be paying shipping anyways so might have more in the cost of the products that will make shipping costs worthwhile from places like Digi-Key and Mouser.
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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    I did and it's solid and won't move.
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  • Re: Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    The Samxon seems to have a big bulge like it's swollen on the top but I just want to see if replacing the capacitors fixes it since I am using another identical unit with the laptop for the past year when this one died a year ago without problems. They might be good brands and models but this AC/DC Adapter runs very hot at 150C for 5+ years.
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  • Replacement caps advice needed for ASUS Notebook AC/DC Adapter

    One of my ASUS Laptop AC/DC Adapters for the 17.3" G74SX Notebook is no longer supplying enough current to the notebook so it's not charging but the voltage on the Multi-meter tests correct. In any case, I am looking for replacement capacitors that either meet or exceed the original specs from Rubycon, Nichicon, Chemi-con or Panasonic and would greatly appreciate if someone can find me suitable replacements with the following original list of what I could read:

    AC/DC Adapter
    Input 100v-240v 2.0A 50Hz-60Hz
    Output 19.5v 7.7A

    Capacitors are as follows...
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