I'll try to summarise -
Opened NES restored pins in 72 pin connector - did not work
Replaced lm7805 voltage regulator - sometimes get grey screen, power light is permanently on when it comes on at all
Have I mis-soldered the voltage regulator?
Do I have to completely reconnect the Nes before it will work? At the moment I'm just attaching power supply.
Expecting flashing light but seeing solid one even when no game present
Also disabled region lockout chip - pin 4 right?!
Any ideas greatfully received
Thanks