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Monitor Question – Spark jumping

Question from Mike: Hi,

First of all, I want to thank you for your youtube videos. They are very infomative and have certainly helped me dive into the world of arcade restoration.

I picked up a Playchoice 10 project. Was excited that it had a monitor in it. Looking to replace my DK3 monitor. Well, I hooked it up to my DK3 machine to test, monitor had a decent image. BUT, I noticed a spark was jumping. I immediately shut it down, discharged the monitor and safely put it away.

I took some pictures to show where the spark was jumping (at what appeared to be regular intervals 3-4 seconds.) Any idea what caused this? Is the monitor shot? Recap it? Do I need to replace that big brown capacitor (if that is what it is) now that it was shocked? I’m new at this.

Thank you in advance for any advice you can give.

Best regards,

1 answer

Tim Peterson Tim Peterson Staff March 16, 2010

Response from Tim: I was almost sure it was your flyback based on the pic, but I asked Michael for a second opinion and this is what he said :

I couldn’t tell really from the pic, but it could be two different things in that location….. the big orange polamar cap is a timing cap and would have high voltage in it and it could be arcing to the ground rod on the flyback in that case the cap needs to be replaced and it will have a value on it and you should be able to see a pin hole in the cap. OR the flyback is cracked in that area and is arcing to the ground rod or to the negative side of that cap. Then the flyback needs to be replaced or for a temp fix dremeled out and filled with silcone. Let me know if that helps or if you need anything else…


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