capacitor with no esr value

[1supertech]

Hello folks
I have come across a capacitor 47uf 50v for a tv power supply with no esr value in curcuit or out of curcuit.cap is not bulged all other caps are have good values I am using EDS 88A capanalyzer I am very new to this so I am assuming this cap is no good. am I right

Problem with TV is that it has green light on power nothing on screen.

[tom66]

Re: capacitor with no esr value

"No ESR"? Does that mean 0 ohms or infinite ohms?

[1supertech]

Re: capacitor with no esr value

I get no reaction from meter at all. Meter is supposed to go thru a discharge then check
dcr then I get esr value according to uf value in this case is 47uf nothing happens on meter when I connect probe to cap

[tom66]

Re: capacitor with no esr value

I say replace it, they are quite cheap components and can cause this fault.

[1supertech]

Re: capacitor with no esr value

Thanks tom66

[kc8adu]

Re: capacitor with no esr value

we call that open.like not there.a non capacitor.

[1supertech]

Re: capacitor with no esr value

Well if it's not there that why my TV won't work. I will remember this terminology now if I can only find the the cap that will fit.

Thanks kc8adu

[multimeter]

Re: capacitor with no esr value

that value cap sounds like a startup cap,50v caps should read around 1 ohm on esr,normally 0.00 ohm esr would be a great value for lower voltage caps,sounds like this one has dried up showing open circuit.

[1supertech]

Re: capacitor with no esr value

Well I ordered the cap lets hope this 13 cent cap will fix 32" tv that I bought for $25.00.
What do you mean by a startup cap? is it a capacitor that remains in-circuit during both start-up and running ?
Thanks for your imput multimeter. All info helps.

[multimeter]

Re: capacitor with no esr value

Well I ordered the cap lets hope this 13 cent cap will fix 32" tv that I bought for $25.00.
What do you mean by a startup cap? is it a capacitor that remains in-circuit during both start-up and running ?
Thanks for your imput multimeter. All info helps.

depending on the circuit,the startup cap normally delivers its voltage to a 8 pin power ic ,it will be working throughout startup and running,sometimes when this cap fails it will cause a chirping sound to be heard on the psu

[tom66]

Re: capacitor with no esr value

The controller IC (8 pins usually, sometimes more or less) needs about 10-12V DC of power, from 115/230V input.

In order to provide this a high value resistor charges up the cap and a zener regulates it. Once the voltage reaches a set point determined by the controller, the controller starts using the energy in this cap to run and turn the output on.

Once running an auxillary winding takes over and provides power to the controller IC, like an alternator in a car supplies power to recharge the battery.

The cap is most important in the brief time at which energy is being drained from it by the controller IC, but no energy is being provided to it. If its capacitance is too low (or in some cases if ESR is way too high) it will be like a car with a flat battery, unable to start. And you will hear a characteristic ticking from the PSU sometimes.

[vinceroger69]

Re: capacitor with no esr value

whats the make and model number of the set your working on? whats the problem with it?

[1supertech]

Re: capacitor with no esr value

whats the make and model number of the set your working on? whats the problem with it?

Insignia model # NS-LCD32

Problem is when plugged in push start button on I get green light nothing on screen. previous owner was watching TV when it suddenly went blank all caps check out fine except one 47uf 50v

[1supertech]

Re: capacitor with no esr value

Thanks all for all this info, between badcaps and Juston Yong I shoudl be a pro in in years to come. :-)

[bp1]

Re: capacitor with no esr value

Hello folks
I have come across a capacitor 47uf 50v for a tv power supply with no esr value in curcuit or out of curcuit.cap is not bulged all other caps are have good values I am using EDS 88A capanalyzer I am very new to this so I am assuming this cap is no good. am I right

Problem with TV is that it has green light on power nothing on screen.

I think your capacitor is shorted.
I have the ESR Micro v4 and within the manual the following explanation is given when capacitors measure zero for esr

Extracts from ESR Micro V4 manual

"If the capacitor is shorted (DC resistance is equal to 0), then «R ONLY» - “Resistor!” will be displayed on the
lower line and the symbol “E” in the top row is changed to “R”. The majority of ESR meters detecting this failure will
indicate a capacitor with an ESR = 0. The same symbols are displayed while low-ohms resistors are checked.

[multimeter]

Re: capacitor with no esr value

I think your capacitor is shorted.
I have the ESR Micro v4 and within the manual the following explanation is given when capacitors measure zero for esr

Extracts from ESR Micro V4 manual

"If the capacitor is shorted (DC resistance is equal to 0), then «R ONLY» - “Resistor!” will be displayed on the
lower line and the symbol “E” in the top row is changed to “R”. The majority of ESR meters detecting this failure will
indicate a capacitor with an ESR = 0. The same symbols are displayed while low-ohms resistors are checked.

i cannot see this,normally i replace bad caps with panasonic fr/fm/fc series,ive had fr series caps that are genuine,bought from well known suppliers,i always test there esr value before i fit them,some in the 16v 25v range show an esr of 0.00 ohm ,ultra lower than low!when the caps that needed to be replaced,are in excess 0f 4 and higher ohms esr,the panasonic fr's when fitted fire the equipment straight up ,no problems,only other alternative,is that the cap he is testing esr on,is in circuit,(said in op that also out of circuit) and there is something else showing a possible short,the proof is in the pudding,if unsure then i would be setting my dmm meter to diode test and measuring across the pads in circuit,and should show some forward voltage drop with the cap in place,and this will also do a "kick" test at the same time,an analog meter set to X10 k will give a more accurate test,or an insulation test.

[mariushm]

Re: capacitor with no esr value

I saw measurements of 0 on Nichicon HZ 3300uF 6.3... they're really low esr

Otherwise most of the Panasonic FM I tested are 0.01 with some of the smaller ones (100uF, 47uF) showing 0.06 or something like that.
The lowest I measured from the parts I have around here was a Nichicon HC 10uF at 0.6 ohm and some G-Luxon 22uF 50v I recovered from an old motherboard at 1.4 ohm

[1supertech]

Re: capacitor with no esr value

Update on my original post. I received my 47uf 50v cap and installed it, very encouraging when I saw the display light up now to put it back together and hook it up to my satellite. hope it works.

[koerneka]

Re: capacitor with no esr value

I too have been fighting with an Insignia 32" - I am waiting on my replacement caps to arrive in the mail - what was the location of the 47uf 50v cap, if you don't have the set put back together now?

[1supertech]

Re: capacitor with no esr value

I too have been fighting with an Insignia 32" - I am waiting on my replacement caps to arrive in the mail - what was the location of the 47uf 50v cap, if you don't have the set put back together now?

Here is a photo cap goes where the red mark is