For the benefit of others, translated as follows:
Hello, I have a Samsung G9 oled monitor (model S49CG95). During use, I found that after cutting off the signal input, a white square will appear in the upper right corner of the black screen. This problem only occurs when the refresh rate is set to 120hz or 240hz.
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I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
