repeating , my reply - to : ' some connector / connection has been reversed ? ' answer ;
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the led panel ribbon cables - will not reach - if mounted ... incorrectly ;
also - replacement boards were matched by the seller on ebay - but i ordered another set ,
just in case ( symptoms remained , and so i refunded my customer 's deposit ; he bought
a new tv and - at his request - i am keeping his old one , for further research ) ;