Repairing a ZX Spectrum+ Reset Switch. 

The reset switch should be connected across capacitor C27. Sometimes it is easiest to connect it directly to the capacitor's leads and other times to nearby points on the circuit board to achieve the same thing. Some continuity testing will be in order to discover appropriate connection points. Given the way I usually mount radial leaded capacitors (see other video about this), I usually connect one side of the switch directly to the negative lead of the capacitor and the other to a via just above the capacitor that is connected to the positive side. The issue 6 Spectrum has purpose designed connection points for the reset switch.

It's a bit difficult to tell what's going on with that poor quality picture. It could be that the TV isn't or can't be properly tuned to the Spectrum's output or the RF modulator in the Spectrum might be failing. I suggest tapping off the composite signal before the modulator to get a better picture. You should be able to find information about doing this at a number of sites, including the forums at www.worldofspectrum.org . Through the fuzziness, I can see the central area of the display has character width vertical black and white stripes. There could be many causes. It doesn't look quite like the result of a typical lower RAM fault (very common), but I can't tell with that poor picture. Try the tests described in ZX Spectrum (48K & 16K) Initial Tests . What results do you get?