Original Nintendo

Go to google.come and search using nintendo repair as key words.

Clean the cartridge connector.

--- sam | Sci.Electronics.Repair FAQ:

Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.

Both cartridge connector and slot, i had trouble with that even when that type of console was 6 months old.

Cheetah

Replace the cartridge connector, this is a *very* common problem, I've been through at least 3 connectors in the decades since I got my NES.

Replace the 72-pin connector. Easy, and a sure-fire cure for the blinking light problem. Available on eBay. Look for a kit that includes a cleaner and a tool for dismantling the game carts, otherwise all the crap on the game connectors will transfer to the new part.

Ok, some more info. The PCB is out of the case, the cartridge connector is unplugged from the board, the 2200u/25V cap has been replaced along with the 2 smaller electrolytics in the PS. All the 'dry' plate-thrus have been soldered and the gum label on the board by the cart. connector has been removed, (I have had problems with the glue becoming conductive over time in the past) .

All of the conductors on the cart. connector have 0 ohms end to end and a resistance between adjacent conductors of > 30 meg.

Still have the blinking display/power LED.

Am I missing something REALLY obvious (Can't see the forrest 'cuse of all these darn trees !) or am I just a bit dim .

Kevin

Just replace the connector, trust us, you can't test it like that, the problem is poor contact between it and the game cartridge. I've never once seen this problem that wasn't caused by a bad connector.

If it was working and then put into storage, the connector didn't go bad sitting around. It still could be dirty contacts inside.

Also clean the contacts on the game cartridges.

Or, as suggested, just replace it.

--- sam | Sci.Electronics.Repair FAQ:

Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.

Mmm, Ok, I will replace the cart. connector but it (the cart. connector) is NOT ATTACHED TO THE PCB and I still get the flashing video output/power LED.

Sorry if I seem to be a bit slow.

Kevin

The flashing just means it cant boot the game. So, if almost any of the pins isn't making good contact, you get the flashing. With the connector removed, well, duh. :)

--- sam | Sci.Electronics.Repair FAQ:

Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs.

Ok, sorry for being dim, I thought you would just get a blank raster with no cartridge installed. Today I learned something new.

Thanks.

Kevin

That's expected behavior, the LED will flash whenever it cannot boot.