AYI is the first clue I have to go on and will post photos of the different voltage regulators I want to test and possibly replace.
It seems AYI no longer manufactures these parts because I can not find them on the internet anywhere.
Part numbers on the different voltage regulators are: AYI 17NF 2 5 63181 316 and w29E20 5873 m1317 D6
Since beginning this post to check on my research for these voltage regulators/diodes (made me think a bit) I have learned how to test these and now looking at replacements but still not sure about the specifications of these parts.
These parts are TO252-3 packages?
Any help will be much appreciated.
These project I reported in an earlier post checking other parts on the TV LED board here
https://www.eevblog.com/forum/beginners/a-kind-of-diode/msg1996220/#msg1996220