What is this?

Thread Starter

1-3-2-4

Joined Dec 26, 2008
199
I assume it's a cap given the drawing diagram.

I've got no reading on my analog meter checking the one on the right but the other on the left I do get a reading.



 

MrChips

Joined Oct 2, 2009
30,720
What do you mean by "no reading on my analog meter"?

What do you mean by "check it out of circuit"?

You cannot infer much by testing a capacitor in-circuit or out-of-circuit.

A capacitor should read "open circuit" when tested out-of-circuit except when it is a high value capacitance greater than 1000μF.

I would guess that is a 2200pF or 0.0022μF cap.
 

Thread Starter

1-3-2-4

Joined Dec 26, 2008
199
What do you mean by "no reading on my analog meter"?

What do you mean by "check it out of circuit"?

You cannot infer much by testing a capacitor in-circuit or out-of-circuit.

A capacitor should read "open circuit" when tested out-of-circuit except when it is a high value capacitance greater than 1000μF.

I would guess that is a 2200pF or 0.0022μF cap.

Well I was using a Ohm meter and not my capacitance meter.. I ended up checking and the 2200pF was reading 01.9 uF and the other 971 uF
 

MrChips

Joined Oct 2, 2009
30,720
Well I used it on my electrolytic caps to test if they were still good or not.
Doesn't work unless you know what you are doing.

If you get a short circuit or any resistance reading then the capacitor is bad.

Capacitors below 1000μF should show open circuit.
For capacitors greater than 1000μF use an analog Ohmmeter and you will observe the resistance increasing as the capacitor charges up.
Reverse the connections and observe the same thing happening.
Eventually, you want to see a very high resistance reading.
 
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Thread Starter

1-3-2-4

Joined Dec 26, 2008
199
Doesn't work unless you know what you are doing.
Ok, so anyways I found the value of the two caps and it turns out it's not the problem of why I don't have power on my power supply.. given everything is SMD and it's a SMPS I'm thinking about just chucking the whole board.
 

Thread Starter

1-3-2-4

Joined Dec 26, 2008
199
Well the thing is, no one has info on it, the company themselves do no have a circuit diagram on it, they just replace when bad.

It's I fix or try to fix this board or spend $ 200+ on getting the same model only just to pull out the power supply as they don't sell anything separate.
 

MrChips

Joined Oct 2, 2009
30,720
Can you post a photo of the whole thing so we can have a look?

What is it out of?

What are the voltage outputs and specs?
 

Thread Starter

1-3-2-4

Joined Dec 26, 2008
199
It's out of a projector it should be outputting both 12V and 5V, I assume it's something near or before the PFC IC because that's what turns things on.

A friend sent me a circuit it's not my projector but how most projectors use the PFC IC





Changed all the caps btw as well
 

Thread Starter

1-3-2-4

Joined Dec 26, 2008
199
ok I wish I could say something changed for the better but it has not :( in this case i went ahead and ordered aused projector just so I can rip the power supply out.
 
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