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Old 25th January 2016, 11:49 PM   #1
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Default Is this capacitor leaking

I've got parasound pdd-1500 not working, just blinking when I push the source button.
Are this capacitors leaking or it is the glue? There are about 30 BG caps on the pcb and just few of them have the leakage/glue under.
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Old 26th January 2016, 12:38 AM   #2
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Hi
I think it is a form of glue rather than leakage, as it is formed
up around the capacitor base. See if your source button
clears when you turn off then back on again. also try the remote control
as source selection is available there and see if it improves. Perhaps
the switch is in some confused state and just needs the remote to
remind it what to do.

Cheers / Chris
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Old 26th January 2016, 07:06 AM   #3
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It looks like glue and Black Gates are not notorious for leaking (although there are many fakes around)
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Old 26th January 2016, 08:42 AM   #4
arnyk is offline arnyk  United States
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Quote:
Originally Posted by shizaudio View Post
I've got parasound pdd-1500 not working, just blinking when I push the source button.
Until the problem has been adequately trouble-shot and isolated, any discussion of the cause of the problem has a very large speculative content. I've seen equipment with leaking caps that ultimately failed for entirely different reasons.

Quote:
Are this capacitors leaking or it is the glue? There are about 30 BG caps on the pcb and just few of them have the leakage/glue under.
The glues that are typically used to glue caps like these down to circuit boards (hot melt glue or silicon glue) are typically far lighter in color.

Silicon glue comes in as many colors as you can imagine, but is typically a translucent white if it does not have decorator color pigment added. Hot melt glue is usually found in its natural color which is a similar light translucent color or a slightly creamy light tan color.

My impression is that the BG caps were installed by some person with unknown skill levels (probably low, because magic caps are audiophile myths) so its hard to say what part of the apparent strangeness is due to failing parts and what part of the strangeness is due to bad quality installation.
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Old 26th January 2016, 08:53 AM   #5
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It is definitely glue. Very common use in the factory when the components will not stand the solder bath in production without falling out of the board. Panasonic and Sony use this method widely. The Silicone used in some boards is to stop coils and components chattering and resonating at high frequencies.
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Old 26th January 2016, 02:00 PM   #6
arnyk is offline arnyk  United States
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Quote:
Originally Posted by davidsrsb View Post
It looks like glue...
On further inspection and reflection...

More specifically the red tinge suggests the common glues that are also used to attach SMT parts.
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Old 26th January 2016, 02:31 PM   #7
Mooly is offline Mooly  United Kingdom
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The first cap looks to have glue going 'uphill' so that's a pretty good clue.

Of far more concern is why the wrapper on the far cap has shrunk up the can. Is it running hot ?
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Old 26th January 2016, 03:16 PM   #8
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Sometimes the glue used on things like that can go conductive or corrosive or a combination of both.
Have a scrape and inspect the tracks under it.
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Old 26th January 2016, 11:59 PM   #9
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Quote:
Originally Posted by Chris Daly View Post
See if your source button
clears when you turn off then back on again. also try the remote control
as source selection is available there and see if it improves.
Hi, Chris
Yes it clears, the same action with remote, unfortunately. Please check the attached video.

Quote:
Originally Posted by arnyk View Post
Until the problem has been adequately trouble-shot and isolated, any discussion of the cause of the problem has a very large speculative content. I've seen equipment with leaking caps that ultimately failed for entirely different reasons.
Right, that is why I'm here to show the problem and to ask for any help.

Quote:
Originally Posted by Mooly View Post
The first cap looks to have glue going 'uphill' so that's a pretty good clue.
I feel the same/

Quote:
Originally Posted by Mooly View Post
shrunk up the can. Is it running hot ?
No, it is light and shadow. not hot at all.

Quote:
Originally Posted by Refugee1 View Post
Have a scrape and inspect the tracks under it.
Yes, Seems I have to solder them out from the pcb to check it for sure.

I've checked in Google few Parasound Dacs PCB photos, seems like they liked to use that sort of fixing caps.
Guess I need to find other cause of the problem.

The signal is on coaxial 1, Coaxial 2 is empty. If I choose coaxial 1 display starts blinking and goes calm when empty IN is activated, coaxial, RF or Toslink.

http://www.youtube.com/watch?v=DzDvwqMd1Tc
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Old 3rd February 2016, 04:27 PM   #10
Cjuried is offline Cjuried  United States
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Looks like commonly used glue, however, it can't hurt to throw an ESR meter on those caps and confirm that their equivalent series resistance is within tolerance.
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