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LC-55LE653U shows sharp logo and goes black keeps cycling this over and over

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Cptnkirk67
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My sharp lc-55le653u keeps coming on shows sharp logo and goes black screen and keeps doing this will not come on normally replaced main board and power supply board but still no luck 
does anyone no a solution to this problem also can't find a service manual for this television. 
Please give any suggestions 
Thanks