is this a blown capacitor and how do you replace it?
#2954023
08/15/21 02:27 PM
08/15/21 02:27 PM
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Joined: Feb 2003
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Andrewh
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the 220 50V VTE is raised and the X in the top clicks when you press on it. This is new to me and I guess some newer caps look like this. But it doesn't look like the others, so I have to guess it is blown? There are no pins under it in the board. Looks like 2 tabs on each side soldered to the board? It is in a dash cam and it started shutting off after about 2 seconds of filming. I am guessing temp's going over 100 here might have hurt it, or just a bad cap. Is there a good replacement choice that won't die due to the heat? Figured I would try to save it rather than spend another hundred or two for another that might die in a year. and @hooziewhatsit in case Dave has a min.
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Re: is this a blown capacitor and how do you replace it?
[Re: Stanton]
#2954052
08/15/21 03:39 PM
08/15/21 03:39 PM
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Joined: May 2019
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It appears to be an electrolytic cap, those usually puke out the electrolyte when they pop. Replacing one isn't difficult, if you have the tools and training. If you have never soldered before probably not easy. You'd need a pencil point soldering iron, NOT A GUN, some method to remove solder and a steady hand. Used to do that kind of thing all the time, but that was years ago. https://bdspeedytech.com/index.php?route=product/product&product_id=3561Good to 85C operating range, which is about 185F, so I wouldn;t jump on that as the issue. I'd get a meter that reads capacitance and check it myself.
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Re: is this a blown capacitor and how do you replace it?
[Re: Andrewh]
#2954109
08/15/21 08:27 PM
08/15/21 08:27 PM
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Joined: Jan 2006
Posts: 8,162 USA
360view
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To quickly test capacitors in circuit it saves a lot of time to use an “ESR Meter” ( equivalent series resistance using high frequency alternating current) The PEAK company $150 meters kind of pioneered the concept but there are cheap meters that do ESR and more https://www.amazon.com/Longruner-Po...tor+meter&qid=1629072745&sr=8-34As others attest, it takes a steady hand, magnifying equipment, special soldering, and practice to repair surface mount boards.
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Re: is this a blown capacitor and how do you replace it?
[Re: Andrewh]
#2956346
08/22/21 02:54 PM
08/22/21 02:54 PM
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Joined: May 2019
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just to clarify, a bad cap wouldn't do something like this? Maybe, but without a schematic and someone who knows how to read it and use that to sort out what the circuits are doing it is impossible to say. Just remember, not all parts are used all the time. It might be possible that this particular cap is only powered up in record mode.
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Re: is this a blown capacitor and how do you replace it?
[Re: Andrewh]
#2956376
08/22/21 04:41 PM
08/22/21 04:41 PM
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Joined: Oct 2007
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hooziewhatsit
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Apparently @mentions don't work It looks like the voltage regulator is the XL2596, adjustable. http://www.xlsemi.com/datasheet/XL2596%20datasheet.pdfPin 1 (going to the cap you replaced) is the unregulated voltage in (ie, 12v from the car). One side of the big square "220" will connect to pin 2 on the regulator. The other side is the regulated output voltage to the rest of the board. This is an inductor, so a continuity test will show continuity through it. It would be interesting to see what the input and output voltage do when it turns itself off. It looks like pin 5, on/off is tied to the ground plane, so it shouldn't be turned off accidentally. The solder joints I can see look decent enough. Have you done a firmware update on them recently? Is there an option to load an older firmware version?
If you ever find yourself in a fair fight, your tactics suck.
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Re: is this a blown capacitor and how do you replace it?
[Re: 360view]
#2956483
08/23/21 08:45 AM
08/23/21 08:45 AM
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Does anyone you know have a “thermal camera” ? Looking at a board and seeing all the temperatures as varying colors would help spot the problem component.
Back before thermal cameras we used a can of "canned air", like the stuff you can use to blow off a key board. We'd spray components one at a time and see if cooling one of them started things working, then replace that component.
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