This is an M series PVM from Sony. It is a High Resolution Trinitron analog video monitor from the 1990s. It will not power on. When it's turned on, all that shows is a red tally light at the top of the screen. For more information on repairs, diagnostics and to connect with me, please visit: https://www.patreon.com/retrotechUSA How to test a Sony PVM M Series Monitor: https://www.youtube.com/watch?v=aDixS6pTZkk The Sony PVM 20M4U Overview: https://www.youtube.com/watch?v=UN2gnHI_R9Q #crt #retrotech #retrogaming 0:00 - The Red Tally Light 4:04 - Fixing the power, but other problems arise 5:27 - The different yokes of the M series 8:08 - I need your help 9:52 - Fixing the red green blue lines issue 13:04 - More on the Red Tally light fault