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Thanks, I have already tried to adjust SCREEN as the service manual says, but the maximum achieved are those results that I put in those photos on Google drive, there is no brightness in the colors and the white is dark, it is a contrast problem you are right, my TV does not have a service menu, the adjustments are all made via trimmer on the printed circuit board of the main board, the contrast that is set from the TV remote control however even set to maximum the result are the images that I posted before, there is some component that is not working well.
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