When nothing shows on screen
Subtitles don't appear on the screen — what to check
① Is the subtitle window still open on the laptop (F11 full screen)? → ② Is the display in extended mode? → ③ Is the HDMI cable connected at both ends? → ④ If the venue has a switcher, is its input set to our laptop? → ⑤ Check the screen's input source. If it still doesn't work, drag the subtitle window to the external screen again and press F11.
The picture cuts out
Check the HDMI cable connection first.
The vertical screen flickers and the ratio gets off
Ask the screen director to black out the translation area → switch to a backup tab you prepared → move it to the external screen and go full screen → let the screen director know it's fixed.
Prevention Make 2–3 backup tabs with the same ratio in advance so you can switch right away if the ratio gets off.