I went to the lg link you gave me and I read this about their subtitle guidelines. External subtitle format: *.smi, *.srt, *.sub (MicroDVD, SubViewer 1.0/2.0), *.ass, *.ssa, *.txt (TMPlayer), *.psb (PowerDivX), *.dcs (DLP Cinema) “The video and subtitle files should be placed in the same folder. For subtitles to display correctly, the video
LG TV subtitles: turn on, won't turn off, format. Press the Home button on your remote. Select the cog icon (top-right corner) to access Settings > Accessibility > Subtitle. Toggle the Subtitle switch ON, and apply your changes. To turn subtitles off, instead of selecting ON, select OFF.Samsung Galaxy Note, Android 11+: Go to Accessibility, then under the Hearing enhancements section select Subtitle settings; from there, select Google subtitles (CC) Google Pixel, Android 10+: Go to Accessibility, then under Audio & on-screen text select Captions. Universal: Search for “Subtitles” or “Captions” and find caption settings.LG TV Prime Video Subtitle Controls Grab your LG remote and hit the Home button , then select the Settings icon in the upper-right section of the screen. Select the Accessibility tab at the bottom
If playback does not work even though the video (DivX) file name and the subtitle file name are identical, check if the subtitle file is [ANSI]-encoded. Open the Windows Notepad, load the subtitle file, and save it as an ANSI format by selecting ANSI from the [Save As] menu. In the case of [SMI] subtitles, playback is limited in the DLNA mode.