Pyle Pldnv78i 7-inch Double Din Touchscreen Lcd Monitor With "infinity parts" Questions

Hi I have a infinity extra sub for home system that has no power I opened up the inside to change the glass fuse and when I plugged it in the fuse got blown right a way I think it a power supply but ...

...infinity (open circuit) regardless of meter polarity. 3. Even a slight reading would indicate a defective magnetron. replace the old remove the wire that attach to the magnetron and mark to identify ...

...mind that even though we have the exact same result, the issue may be varied to a degree of almost infinity. It smells like poo, it looks like poo, it even taste like poo, but it might be a ham ...