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Testing capacitors do i have to take them all of the print to test them or can i do it otherwise? And what value shows me a capacitor is broken?

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Take them out of the circuit. Put an ohm meter across the leads, the meter should swing all the way over then slowly go back to zero. If the meter doesn move, the cap is open, if it goes all the way over and doesnt return it is shorted.

Posted on Aug 31, 2009


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Air compressor 2hp 230v 1ph motor. I need to know how to test a starting capacitor. Thanks

IF you don't have a special meter, that costs more than the capacitor, just replace it. The meter is called an ESR meter and they are $$

Aug 26, 2017 | Air Tools & Compressors

1 Answer

The fan turns on, blades don't move. The net says it is a bad motor capacitor. Mine has an LJY280A single capacitor switch. If I replace that, the fan should operate correctly, yes?

It probably is the capacitor but no guarantees as the insulation of the motor windings could have broken down or there might be another fault. Proper checking with an insulation tester is advisable.

If the capacitor is merely a start capacitor and not a start/run capacitor the motor should perhaps hum a little when switched on and then run normally if the fan blades are given a vigorous turn by hand.
There are several ways of arranging the motor circuit and some knowledge of these would be useful. You could have the capacitor tested by a local motor expert.

Capacitors bought as spare parts from appliance manufacturers tend to be very expensive. Capacitors are usually bought in by such manufacturers and replacements can be sourced much cheaper direct if the type and values and the maker's detail are present on the capacitor case, otherwise you will need the services of a motor specialist to determine the values for you if the information isn't available elsewhere.

Feb 17, 2017 | Hunter Dryers

2 Answers

How do you test a relay or a capacitor

The below applies if the components are NOT connected to anything else That is NOT in circuit and 'live'

1) A relay will have a coil and contacts, Use an ohmeter (multimeter / circuit tester) across the relay COIL to find out its resistance. The CONTACTS will show a short circuit or disconnection across the terminals according to the type of contacts (make or break).
2) You can't easily test a capacitor except it will show a disconnection (infinity) if you try to measure its resistance with the above meter.

Plenty of help on the internet via search engine.

Aug 10, 2014 | Frigidaire Refrigerators

2 Answers

How to know if capacitors are bad on LG 42" hd tv

usually they will puff up on top. They should be completely flat on top any sign of puffing up or rounding on top will indicate a bad capacitor.

Apr 04, 2013 | LG 42LG30 42 in. LCD HDTV

1 Answer

Can i use 10nf3k ceramic capacitor to replace10pf3k ?

Hi Max,

Ceramic types are often found at the low range of capacitive values and electrolytic types are are the high end of capacitive values. Ceramic and electrolytic caps do certain jobs better when of one design instead of the other. The capacitive values may be the same, but there are other qualities that don't get printed on the part. One of the most noticeable differences is that electrolytic types don't do a very good job passing radio frequencies (RF). You'll often see several ceramic types in parallel (if needed) to get the correct amount of capacitance when a single electrolytic would appear to do the job in an circuit where the frequency is in the RF range. Audio Frequencies (AF) on the other hand are significantly lower and do not pose the same problem. There are other types of caps and they each have situations where they would do the best job.

In short, the developer / manufacturer selects all the parts based on a wide range of variables he needs to control based on design and testing. You should always replace components with like components, otherwise you risk adverse reaction(s) from one of those variables that had originally been contained.

Click the link below for some basic info about caps:

I hope this was helpful & good luck!

Nov 05, 2012 | Computers & Internet

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I have an ilo model no.lct32ha36 the power supply was acting up and now we have no indication of standby or anything else after the power went out for a quick moment. what should i look for.

Switch Mode power supplies usually are left on permanently and as a result the start up circuit is never used. When the power in the house goes off, the start up circuit is not working because the start up capacitor has "dried up" and lost its value. Unfortunately some times it half works and takes the output stage out.
Check for a semiconductor fuse in line with the transformer. It may have failed.
Firstly ensure the main large capacitors have totally discharged otherwise when removing the components, there is a chance that they will damage other components.
The components to look out for are, on the mains side, small electrolytic capacitors that when you measure them with a capacitance bridge, they are low value. The components must be removed to test them.
On the power side of the board, there are a few large capacity capacitors, they usually show physical signs of aging and can be replaced.
Alswo to look for are any very high value resistors. Sony love to use 22Mohm resistors that go open circuit as do other manufacturers.
I hope that gives you an insight into switched mode power supply repair.

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1 Answer

Blower motor doesn't start with capacitor installed!

you need a meter that will measure uf (micro farads) it should read within about 10% of the rating 12.5uf otherwise you could charge it with an insulation tester (megger) and short the terminals with an INSULATED screwdriver to see if it discharges.

Dec 21, 2009 | Goodman CKL24AR24 Air Conditioner

2 Answers

Monitor problem.

um.. im just gona say this it seems obvious but on mine one of the leads connecting the sub to the rest of the cabinet fell off and all i had to do was reconnect it and it was fine.

Aug 11, 2009 | Yamaha NS-A636 Speaker

1 Answer

Flat screen monitor has gone black

You can test capacitors with an ohmmeter. A good capacitor behaves like a short circuit when you first apply a voltage, then its resistance increases as it charges. The capacitors that fail are electrolytic types with polarity, so be sure to put the meter ground lead on the capacitor negative. The cap will be marked. An open capacitor will show no kick in the reading, and a shorted cap will show a constant low resistance.

Now, having said all that, ohming a capacitor isn't 100% effective as a test. A capacitor's value may change to the point where a circuit will stop working, but if the cap isn't shorted or completely open, or is just a very low value, the ohmmeter test won't show a problem. A capacitance tester is better. Many digital meters include a capacitance test function.

Most inverter circuits have only a small number of capacitors, and it's usually faster just to change them all. If you replace a capacitor, keep the capacitance the same (the microfarad value) but use a little higher voltage rating. Caps come in standard voltage values, and they get physically larger as the rating increases, but if you just go up one level the new part will usually fit. The main reason these go bad is that the manufacturer used too low a voltage to begin with. It keeps costs down, but the parts are stressed and often can't deal with it.

Dec 06, 2008 | Mag Innovision 19" LCD Flat-Panel Monitor...

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