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I have changed config in the following way:

overscan_left=16
overscan_right=16
overscan_top=16
overscan_bottom=16

framebuffer_width=800
framebuffer_height=600

config_hdmi_boost=6

And I am in text mode (no GUI).

With this I have TV blinking with period of several seconds.

Also the TV reports 640x480 on it's OSD, despite the fact I see by eyes, that resolution is larger, then when I leave framebuffer lines commented. When these lines commented, the TV is still blinking.

What else can be done?

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I have seen improvement with a different (better quality) HDMI cable, and avoiding HDMI splitters / converters / adapters along the way. Trying a different resolution may also help.

In general however, there are screens which work poorly with the Pi, despite good cables and config_hdmi_boost. If this is the case, there's nothing you can do.

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  • OP does not mention model Pi so just wanted to add that config_hdmi_boost doesn't work on the Pi4 raspberrypi.org/documentation/configuration/config-txt/video.md
    – Dirk
    Mar 24, 2021 at 13:30

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