Finding Bad Capacitors With A Hair Dryer Or Heat Gun
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- Опубліковано 26 сер 2024
- When trying to find the source of an intermittent problem, Sometimes applying a little heat from a hair dryer or heat gun to at a capacitor, may temporarily restore the capacitor long enough to verify that a bad capacitor is what's causing your circuit to malfunction. If you do use this technique, be careful not to over do it with to much heat,, so you don't cause any new problems .
Good tip.
I used to use a hair dryer to heat a whole device to see if the fault would clear.
Good starting point if you suspect bed electrolytics.
Well that debunks my theory on why one of my tvs doesn't work. An old 5" Samsung crt type. When I got it, it wouldn't power on, so I stored it in the garage until I got to it for repair. Well then winter arrived, and I happened to just plug it in for fun, powered it on and it fired right up in the garage. It only works if it's around 20° F. In the house where it's warmer, it's a no-go. Eager to see the cold cap vid.
When I mentioned using the freeze spray technique, freeze spray was something I would use, when I had an intermittent problem that would work at times, and I wanted to trigger the problem to occur, by freezing one of the capacitors, hoping that the electronic device under test might fail to turn on when the capacitor was cold.
This problem sounds like a broken solder joint that expands and opens the circuit when it gets warmer. I'd try looking for that.
Nice tool !!
Been there done that !!
The radial shaped ones can
leak out the bottom, too.
It'll pay to look under with a bright light
if possible. Lable their polarity or photograph before lifting off the board.
Great demonstration.
Thank you. Just for the record, I've replaced many electrolytic capacitors that don't didn't show any signs of leakage or bulging.
@@GrantsPassTVRepairsome split the top vent without bulging or the rubber seal without leaking any fluid. The fluid boils dry inside the capacitor can.
Wow! that’s cool! i’m going to have to try this one!
I have a high end JVC VCR that while valuable, it doesnt work right away. I literally have to throw the thing in a barely large enough food dehydrator for a few hours to get it warm enough to operate. Once it operates it will stay on forever, until i turn it off at which point it would need to be warmed up again. Obviously this JVC model is known to have bad capacitors.
In a related sense an IR camera is a great way to look at circuits/components to se if their cold/warm/hot relative to each other. Just had a flir pro stolen, I'm compelled to get another.
it gives you the series resistance of the cap, not the capacitance, you can have two caps of the same farads and yet they can have different series resistances.
Yup this happens allot
Especially in computers in the power supplies you will find n number of videos on youtube showing how if you warm the PSU with a hair dryer from the behind throught he fan it will start working again this usually happens in winters
I had an old 10 megabit Ethernet card that wouldn't work until I heated the 20MHz crystal a bit with my soldering iron to get it started. A lot of intermittent issues are just temperature related.
For sure. Using a little heat can be a great electronic troubleshooting aid on more than just capacitors.
No, they are not temperature related.
You are just using temperature to find them.
If the board fails because of the temperature, too cold, too hot, then you can say it is temperature related.
A crystal that is intended to work at 68°F that doesn't work at 68°F is not a temperature related problem, even though you have heated that crystal to 105°F. You're just finding the faulty component using heat.
Same here in this video. He is using heat to find the problem; the cap isn't suffering from a temperature related problem.
@@deang5622 I wasn't using temperature to find the problem, I was using heat. I can play this game too!
Never seen that equipment before..Nice..
I love your work
In my limited capacity, I'm glad to have learned this & with limited resistance but I'm unsure if I'll be granted the chance to use it? 😁
Unless you do a lot of repairs perhaps not.
@@GrantsPassTVRepair Watt a true statement.
I can tell by the bloated top that its a bad cap
That's often the case, but I've seen many bad capacitors that had no physical indication they are bad.
I have that same capacitor testor..... they aren't cheap!
No they aren't. I've been told the capacitor wizard might have been a better choice, but they are spendy as well.
interesting
I can se that capacitor bulging from here.
So much hetter than all the junk out there.
fat ps3 nec token YLOD explained
I didn't know capacitors had an ohm value, I thought they were measured in farads.
Capacitors are measured in Farads.
But they also have a parasitic resistance and even parasitic inductance.
A perfect capacitor has capacitance only. But real capacitors are not perfect.
The parasitic resistance is referred to as ESR - equivalent series resistance.
I love you stuff thank you