N64 Turns on but there is no video

So I was given a N64 to repair and was told that it would play sound but no video. However, when I brought the N64 home to check it out, there was no video or sound. The red light comes on. I have checked all of the cables and power supply with another working console, so those aren't the issue. I have also tested the game and jumper pack I am using on another console and those work as well. I have done my best to clean the cartridge slot and expansion slot. I have even gone as far as resoldering the pins of the cartridge connector, A/V port, and power port.

EDIT:

I'm not sure if this is important to point out, but while I don't have any video/audio, there is a change that happens on certain TV's when I turn the console on. I am using the RF switch for my N64 and when I turn the console on, the TV goes from just displaying static to a black screen. However, it still shows the "No Signal" message on the TV.