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(Topic ID: 188769)

Dr. Who audio board cap exploded


By RocketFromTombs

3 years ago



Topic Stats

  • 10 posts
  • 6 Pinsiders participating
  • Latest reply 3 years ago by RocketFromTombs
  • Topic is favorited by 2 Pinsiders

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2634783D-7467-4340-866D-D1169B98F828_zpsyvcjq4zn (resized).jpg

#1 3 years ago

I originally posted this in the Dr. Who owners club thread, and was directed here...

Okay, I've got a Dr. Who that has been sitting in the basement for a couple of years. Decided yesterday to turn it on and see what happened... Got the "factory settings restored", which I expected, as the batteries haven't been touched. Also, as I was going through the tests, the machine would keep resetting. I'm guessing something is taking down the 5v, but as I was doing a quick check on stuff, there was a sudden sparking over by the audio board/fliptronics board area. Quickly turned it off, and investigated to find this on the audio board:
C26 is exploderated! Any ideas what I should be checking out next?
-Brian, off to find the correct schematics for the audio board.

2634783D-7467-4340-866D-D1169B98F828_zpsyvcjq4zn (resized).jpg

#2 3 years ago

C26 is a tantalum capacitor. They just have a habit of exploding after long periods of no use.

#3 3 years ago

It appears to be... Doesn't look like an electrolytic or poly. Should I just replace it and continue with my reset troubleshooting then? Should I stay with tantalum or switch to something else?
-Brian

#4 3 years ago
Quoted from RocketFromTombs:

It appears to be... Doesn't look like an electrolytic or poly. Should I just replace it and continue with my reset troubleshooting then? Should I stay with tantalum or switch to something else?
-Brian

Replace with another tantalum and continue troubleshooting. It's more than likely that the cap just failed.

#5 3 years ago

Exactly the same thing happened on my two CFTBL machines after I have pulled them out of storage after a few (7) years hibernation. I have replaced the caps and everything was fine.

#6 3 years ago
Quoted from arolden:

Replace with another tantalum and continue troubleshooting. It's more than likely that the cap just failed.

True. It is worth changing the other same value tantalum caps as well.

#7 3 years ago
Quoted from arolden:

C26 is a tantalum capacitor. They just have a habit of exploding after long periods of no use.

Good to know.

#8 3 years ago

Thanks everyone,
I'll replace those caps and continue with my reset issues.

- Brian

#9 3 years ago

Tantalum does not ripple or being close to the voltage rating, surges... Or they explode... violently.

Use a higher voltage rating tantalum. Electro is also probably acceptable. I would increase the uF slightly and voltage rating for electro cap.

#10 3 years ago

New tantalum caps arrived today. I'll replace them later this week and then continue with troubleshooting the 5V. Thanks!

-Brian

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