hi all. having a issue with a samsung plasma PN50B650S1f. no pic. no sound. starts up but nothing stays black.. checked all the va,ve. voltages on y,z and power supply. there all good.i replaced y buffer and y main board. but have the same issue... any thoughts.. appreciate any feed back thanks. im thinking logic board but im not sure how to test that.. led led light on logic board has good heart beat.. other word its blinking 1 persecond. 
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