I'm working on repairing a front-loading NES for a friend (not the toploader I was fixing earlier), which initially just output a solid brownish-green screen, but now after some work I have it displaying in black and white (no chroma?). Any ideas how to troubleshoot this? So far I have:
Cleaned/replaced the cart connector
Removed and tested the CPU/PPU (both work fine on another board)
Replaced the 7805
Replaced all aluminum capacitors
Adjusted the trimpot (~10 full turns in each direction), and also swapped it out with one from a working board
Thoughts for a next step?
Cleaned/replaced the cart connector
Removed and tested the CPU/PPU (both work fine on another board)
Replaced the 7805
Replaced all aluminum capacitors
Adjusted the trimpot (~10 full turns in each direction), and also swapped it out with one from a working board
Thoughts for a next step?