Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do mybest to help.
Initially, is the Sylvania completely / electrically dead?
The described symptom almost always points to an internal hardware issue. The systems is detecting a fault thus kicking in auto-protect mode.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter (and even perhaps a soldering iron)?
Post back when available.
Also please provide clear picture(s) of the internal circuit board layout to serve as common reference. Click HERE.
To my understanding: