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I can't seem to find these capacitors?

M.Joshi

Member
Hello,

I am looking for these capacitors which are leaded and measure approx. 7mm height x 8.5mm diameter.

Capacitors.jpg

What type of capacitor should I be searching for? They look different to standard electrolytic capacitors.

Thanks.
 

Pommie

Well-Known Member
Most Helpful Member
My guess would be aluminium electrolytic capacitors. I'm also guessing that the black mark indicates the negative lead - does the arrow on the PCB align with the black sides? Only 1 arrowhead is visible.

Also, that looks like a very old board, any idea what year it was manufactured?

Mike.
 

M.Joshi

Member
They look like Polymer Electrolytic Caps - made by Panasonic, Nichicon and some others.

RS still sell them and I should think other major component suppliers will have them too.
Thanks, I can't seem to find the same profile. Is there anything special about polymer ones? Is it lower ESR and size?
 

rjenkinsgb

Well-Known Member
Most Helpful Member
We've used similar style ones in the past, but I cannot figure out where they came from! I'd guess Farnells, though they do not seem to do that wide, low profile style any more.

LowProfileCapacitor.jpg

They may well have been discontinued by the manufacturers in favour of surface mount ones.

If the exact size / proportions are not important, then there are a few types available:
 

M.Joshi

Member
I would suggest normal electrolytics would be perfectly fine, are you sure the existing ones are faulty?.
Going to desolder them and check. Can't measure them properly in-circuit. It's for a backlight inverter board where the fuse has blown. Lots of darkening on the PCB.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
Going to desolder them and check. Can't measure them properly in-circuit. It's for a backlight inverter board where the fuse has blown. Lots of darkening on the PCB.

I would say it's VERY, VERY unlikely to be those capacitors. Have you replaced the fuse?, and did it blow again? - inverter fuse failure for no reason is common.

If the screen LED or CCFL?.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
It's a CCFL on an old Sony Bravia TV. Haven't replaced the fuse yet. Why is fuse failure common?

I've always presumed it's simply aging/failure of the fuse, no cause for it.

Replace the fuse, it will be perfectly fine - as a Sony Dealer Engineer I replaced countless inverter fuses (SM ones) in numerous Sony sets - and in fact I have one of them in my bedroom. Incidentally the fuse is on the inverter board, which is part of the LCD panel assembly, and which isn't a Sony part at all.
 

M.Joshi

Member
When removed from the boards, almost all 20 of the capacitors measured out of spec between no reading to typically 80-140µF.

Attached is a photo showing the burnt PCB leaded fuse. Looking at photos of other inverter boards for sale, it seems to be a F10A. Is anyone able to confirm from the schematics?
 

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  • Burnt fuse.jpg
    Burnt fuse.jpg
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