My month old QN65Q9FN suddenly began to display the same symptoms as described by many others in this thread where the screen would periodically blank and black out. The set is connected to a Yamaha TSR-7810 receiver which in combination with my beloved previous Samsung plasma never gave a hiccup. When devices were directly connected to the tv's inputs I did not see the problem so I assumed the issue was coming from the receiver and changed inputs, cables etc to no avail. I was resigning myself to having a defective new set. The issue was even presenting itself when playing music from the Yamaha's usb music player. The mp3s and FLAC files were stored on a Samsung 64GB FIT USB 3.0 flash drive. The music played fine and did not drop out even when the screen blanked. However the flash drive was becoming fussy and stopped being readable from my computers usb 3.0 ports months ago but worked fine connected to a usb 2 port and in the receiver. Two days ago the drive failed while playing in the receiver. I replaced the drive with a spare and my screen has not blanked out since. While certainly not universal it appears a wonky peripheral like a usb drive could be the culprit. Another receiver related issue seems to be HDMI-CEC no longer works with my Fire Stick 4K when it is connected via the Yamaha. At first it worked periodically and now rarely so my Logitech universal is of limited use. It works when plugged directly to the tv's inputs so this a receiver issue again. With the Samsung plasma it was finicky but usually could be made to work after a few tries.
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