D19 diode very hot

[dboston55]

Hi, newbe here
Can anyone verify what D19 diode is,its part # is A05w8. I can find a lot maybes but no positive identification of it.it has no manufacturer markings. I found lots of threads on this diode but no verification of it functions.It is running very hot to touch won't boot only red LEDs.With power supply current goes up proportionately to increase of voltage acting like short.

[vic7767]

What model # are you referring to?

[dboston55]

Thank you for looking at my question. It is a model 531. Since I joined your site and learned how to get around better I am totally amazed at the work and dedication that has been but in this site and it being such a learning tool. I thank you for that. Great work