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Reel Rookie

Roku Express 4K+ flickering with ghost images

I recently started having this problem on Roku Express 4K+, at various times

1. The top 4/5 of the screen is darker and flickers (except a narrow band at the bottom) 

2. Ghost images from a previous frame stay on screen, creating a double exposure effect

3. White lines run from top to bottom (they appear to be aligned to text or graphics eg the Disney+ logo)

It’s not the TV, as a Chromecast device doesn’t have this issue. In fact when I switch to the chromecast port, the ghost lines disappear (only to reappear after a while when I switch back to Roku)

Any clues anyone?

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