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-   -   Is this a leaking cap? (https://eab.abime.net/showthread.php?t=57857)

DarrenHD 18 February 2011 04:11

Is this a leaking cap?
 
This is a photo from inside my Escom A4000T. What is that red stuff?

Is it the cap leaking? It looks like some sort of resin.

http://www.hd-zone.com/leak.jpg

kipper2k 18 February 2011 04:46

It probably is a resin of some sort. Board manufacturers sometimes use a resin or adhesive sometimes to hold the components in place just prior to them being soldered

DarrenHD 18 February 2011 05:01

Quote:

Originally Posted by kipper2k (Post 737336)
It probably is a resin of some sort. Board manufacturers sometimes use a resin or adhesive sometimes to hold the components in place just prior to them being soldered

It doesn't really look similar to other leaking caps I've seen and it's not getting "worse", so hopefully it is just resin.

Thanks!

Kakaboy 18 February 2011 05:45

Is it hard or soft ?

DarrenHD 18 February 2011 06:08

Quote:

Originally Posted by Kakaboy (Post 737342)
Is it hard or soft ?

I didn't touch it... :-/ it does seem to be translucent, since you can see part of a trace below it.

Jope 18 February 2011 07:02

Definitely not electrolyte. It's probably just glue.

Damion 18 February 2011 08:52

I agree with the others, looks nothing like cap leakage. :)

Bloodwych 18 February 2011 09:41

Jam Sarnie whilst working on your 'miggy?

Loedown 18 February 2011 12:11

On boards that use dual sides, most resistors and smaller caps are placed on the board using a glue, so that when the cards go through reflow ovens or reflow solder wave equipment nothing falls off.

I've not seen an electrolytic been glued before but there's no reason why it cannot be, this is 100% glue and not leakage in any way.

http://img.alibaba.com/img/imagerepo...-web1_7950.jpg

http://www.electronics-trading.com/Image/cartridge.jpg


You will most likely find two or four dots somewhere on the board from when the adhesive was applied in the first place, one of the companies that I worked for used to use a Universal GSM only for this purpose and only ever on a few boards.

http://i.ytimg.com/vi/gjsLktISVAE/0.jpg

pandy71 18 February 2011 12:25

Glue for SMD part - each SMD is glued to PCB before soldering - without glue it simply fall from PCB (valid for wave soldering - when IR and similar methods are used for soldering glue in theory is not needed - solder past should be enough but anyway glue is used sometimes, also glue is required for two side component populated boards for bigger SMD, small ones are stay due of solder own surface tension)

FOL 18 February 2011 12:48

Whooops, could'nt see whole of picture, :(.
I would agree with others, now I can actually see the cap on the right side of picture, :).

DarrenHD 18 February 2011 16:57

Quote:

Originally Posted by FOL (Post 737411)
Whooops, could'nt see whole of picture, :(.
I would agree with others, now I can actually see the cap on the right side of picture, :).

Thanks for the reply guys...I think the consensus is that it is not leaking :)

Good news :)

FOL 18 February 2011 18:17

Quote:

Originally Posted by DarrenHD (Post 737454)
Thanks for the reply guys...I think the consensus is that it is not leaking :)

Good news :)

Whats the green stuff on C263A?

Thats the cap I was originally looking at, thought everyone was going nuts, cause I could'nt see the red stuff, lol.

pandy71 18 February 2011 18:43

looks like poor camera sensor (debayer fail with low light?)

DarrenHD 18 February 2011 21:13

Quote:

Originally Posted by FOL (Post 737474)
Whats the green stuff on C263A?

Thats the cap I was originally looking at, thought everyone was going nuts, cause I could'nt see the red stuff, lol.

Hmm not sure, could just be the camera...was taken with an iPhone 3GS...(eg. crap camera, no flash).

I had to shine a flash light on the board to get light and try to take the picture at the same time.

rkauer 19 February 2011 05:31

The capacitor is leaking (see the grey colour on the pads). The red thing is SMD glue.

Swap it.

alexh 19 February 2011 07:51

Quote:

Originally Posted by rkauer (Post 737592)
The capacitor is leaking (see the grey colour on the pads).

You cannot tell from the photo. It might be rust from a leaking capacitor. Might be shadows on the photo and just be the soldering.

pandy71 19 February 2011 11:59

IMO cap is ok - picture such quality like this can be confusing


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