Capacitor Polarity

[dark_hawk]

Hi,

I have this Toshiba Laptop Charger I'm fixing, Had a problematic cap so I desoldered it and order on of the same capacitance and voltage (82uf 400V). Problem is the PCB has no indication for the cap polarity. (C051)


How can I find the correct polarity.

Thanks.

[G7PSK]

My guess would be that it is non polarised as polarity is not shown, follow the circuit through to check where it goes if one trace to goes to a diode you will have the polarity.

[PA0PBZ]

It looks like the main(s) filter cap right after the diode bridge, so it should not be too hard to figure out the polarity.

[mariush]

Don't you see that black bar on the right side of the capacitor footprint?  That's the NEGATIVE of the capacitor.

[dark_hawk]

That Simple huh.

Thank you.

[MrAureliusR]

Yeah, after some zooming in you can actually see the + and - symbols on the holes...