I need help fixing an Nes i Found for cheap at the flea market, shell in great condition but i got no power when i tested it with my working OEM adapter, i know it works because i have another fully working Nes.
Opened the shell to inspect the board and i noticed there's a LOT of corrosion on the small AV-RF-Power module, cut the metal shield from the top to expose the board and gave it a good cleaning with qtips and alcohol, then checked for continuity on the DC jack and it is good and my multimeter says it is actually getting 10v so i know the DC plug is working, i don't see any broken traces on the bottom of the small board, so tried to turn it on again and it didn't work.
Next step was bypassing the video-power module completely by patching 5v directly to the main board, using a USB cable i soldered to the central pin on the 5pin connector on the mainboard, and the other cable to ground, plugged in a portable battery and it works perfectly, played for about an hour with no issues at all.
So, after that i replaced the 7805 regulator for a brand new one but still nothing, after that i cleaned and checked the power button to see if it actually works and its working as intended, power button off has no continuity and power button on has continuity on the bottom of the front buttons board, and also on the main board on pins 3 and 5 i believe it was (don't remember right now).
So now i need some help trying to find the culprit of this... im out of ideas other than replacing the caps on the av-power board, that's what ill do tomorrow, but i don't see anything strange with the main 2200uf cap, if that doesn't work either, is there any way i could patch 5v directly from the DC jack to the 7805? in theory i think i can use a 5v 1amp AC adapter and patch it directly to the central pin on the 5pin connector, BUT that will be dangerous since if by mistake somebody plugs a higher voltage adapter it will damage it.
I need some ideas, what can i do so i can still use an AC adapter to power it on AND be safe for the console in case a different adapter is used...
Opened the shell to inspect the board and i noticed there's a LOT of corrosion on the small AV-RF-Power module, cut the metal shield from the top to expose the board and gave it a good cleaning with qtips and alcohol, then checked for continuity on the DC jack and it is good and my multimeter says it is actually getting 10v so i know the DC plug is working, i don't see any broken traces on the bottom of the small board, so tried to turn it on again and it didn't work.
Next step was bypassing the video-power module completely by patching 5v directly to the main board, using a USB cable i soldered to the central pin on the 5pin connector on the mainboard, and the other cable to ground, plugged in a portable battery and it works perfectly, played for about an hour with no issues at all.
So, after that i replaced the 7805 regulator for a brand new one but still nothing, after that i cleaned and checked the power button to see if it actually works and its working as intended, power button off has no continuity and power button on has continuity on the bottom of the front buttons board, and also on the main board on pins 3 and 5 i believe it was (don't remember right now).
So now i need some help trying to find the culprit of this... im out of ideas other than replacing the caps on the av-power board, that's what ill do tomorrow, but i don't see anything strange with the main 2200uf cap, if that doesn't work either, is there any way i could patch 5v directly from the DC jack to the 7805? in theory i think i can use a 5v 1amp AC adapter and patch it directly to the central pin on the 5pin connector, BUT that will be dangerous since if by mistake somebody plugs a higher voltage adapter it will damage it.
I need some ideas, what can i do so i can still use an AC adapter to power it on AND be safe for the console in case a different adapter is used...