So, around 3 years ago I bought an hdmi converter and upscaler by kaico for the N64. It worked the first few day but suddenly the console stopped outputing image. A few days ago I tried many solutions like reinserting the expansion pak or cleaning every connector of every game pak i own and the one of the expansion pak itself. Even the connectors on the console. But still nothing... I also tried the kaico adapter in every video mode it has and with and without powering it by usb. I don't know if it's a console problem or an adapter problem (any of them would annoy me big time because the adapter costed almost as much as what a second hand n64 costs) but unfortunately i don't own any display with composit video currently.
This is quite sad because this console means a lot for me and I really don't want to emulate. I also would like to access my save files.
So if anybody would want to share an idea of what's happening I would be really really thankful. Best regards.
P.S: My Nintendo 64 is PAL
Edit: I used microfiber and cotton with 99.8% purity isopropyl alcohol for the cleaning, and there's no visible oxidation crust on the cartridge or expansion pak pins.
Edit 2 just in case: The power led turns on (the red one in the front)