philips 55pfl6606T/12 shows philips welcome screen and then goes black

philips 55pfl6606T/12 shows philips welcome screen and then goes black

hi, i all ready replaced the power board thinking it went in to standby mode but that did not help, so now i wonder if it could be the main board that is bad,it shows the philips on the screen and then goes black or could it be the t-con board??

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