why is there an extra cap on my monitor

firepowerplayer

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I was capping a k7400 and I found a it had a cap that did not show politary. It alos had no marking on the bpard. I saw a pic of a chasis, and no cap there either. Any ideals. Monitor was working, but fuzzy.
 
pic

the big red button shows where the cap was. I did not realize the deal untill i had allready cut it. Also if the cap that was there was elotrolitic, it should have been marked. So if I replace it do i use an electrolitic?
Thank you all for looking
 
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No polarity means that it is non-polar, and a polarized electrolytic will not work as a replacement.

It's no big deal that there is no marking there. A lot of times the factory final-testing techs add a part here or there to correct issues the chassis is having without having to completely depopulate the board and start again. You should put it back the way it was...
 
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