Nes issue - not 72 pin - help please

[Sam-u-rai]

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

[cynicalhat]

when you disconnect pin 4 of the CIC, the NES doesnt power cycle (blink) anymore.

[Sam-u-rai]

Thanks but that still doesn't explain my grey screen - that's why I was wondering if I had soldered incorrectly. Almost like not all current was completing the circuit.

[cynicalhat]

I've seen all kinds of colors flash on the NES including grey. Id say put it back alltogether and see what happens. Worst case you get more practice de-soldering.

[APE992]

The voltage regulator over by the power connector that has its own heatsink? I'm not 100% sure its a standard LM7805 myself.

But you could try replacing the very large capacitor on that board. I believe the one sticking up through the shielding is responsible for power regulation. Trying to track down a sound problem myself and it seems to be related to a capacitor issue inside that damned shielding. Problem is the sucker is soldered shut nicely and I'm out of desoldering wick...

[cynicalhat]

the cic chip being disabled prevents the system from resetting (blining) if a game is making poor contact with the connector. are the games polished clean? is the connector on the motherboard polished clean? are you positive the pins are making good contact with the game after you restored them? did the system work (even if it was intermittenet) before you tooled around with everything? have you tested the voltage with a multi meter? did you accidentally get excess solder around the contact points with the voltage regulator and short something?