Hi,
Certain games are displaying lines of dots. See attached pics.
My console is a frontloader NESA-001 PAL Asian but i replaced the CPU PPU and Crystal with the ones from Famicom HVC-001.
Can anyone please advice what to do to fix this?
Most likely dirty video pins on the cartridge or in the cartridge connector. Clean the pins with 90%+ isopropyl alcohol and a toothbrush or cotton swabs for example and let it dry for some time before you turn on power again. There should be guides if you search the internet.