LED TV power supply filter capacitor replacement

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rahul411

Joined Feb 19, 2018
247
My tv had some some issues with the dull images and was turning off after some time. I opened it and found that the mains supply filtering capacitor was dead. As of lockdown i can't get the replacement but i have some power supply board from where i can get a capacitor.
The capacitor on the TV power supply is 100uf 500v, but i have two 330uf 200v capacitor, one 680uf 200v and ten 330uf 400WV.
The question is Which one should i replace.

IMG_20200410_162935.jpg
The dead cap, 100uf 500V
 

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AlbertHall

Joined Jun 4, 2014
9,830
In desperation you could use 3 of the 330uF in series (= 110uF which is near enough). They would have a total voltage rating of 1200V, more than enough.
The problem is they would need equalising resistors to ensure they share the voltage equally. See the attached PDF.
 

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Externet

Joined Nov 29, 2005
1,493
The 500V rating may obey for a 240VAC mains; but if you live in a 120VAC location, you may get by replacing it on a lower voltage rating like the 400V.
 
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