Hi,
I have bought recently a NES that won't turn on ..... is there any solution to fix it ?
Give us more information. Are you using the official AC adapter? Have you measured the voltage at the output of the 7805?
Hi,
Yes, I have tried to use the oficial AC adapter, but not yet the voltage at the output.....can you tell me where it is situated ?
Do I have to desolder any capacitor and solder a brand new one (or anything like this ?)
I have not seen ever a NES with dead capacitors, so don't replace any yet.
The 7805 is a three-pin IC that looks like a big transistor and has a heatsink on it. It is on the small childboard where the RCA video/audio pins are. When looking directly at the text written on it, the left-most pin is pin 1 and right-most pin is pin 3.
Pin 1 is input (which should measure around ~12V DC) and pin 3 is output (which must be 5V DC). Pin 2 is ground but when measuring you can use any metal part of the shielding as ground as well.
socram8888 wrote:
I have not seen ever a NES with dead capacitors, so don't replace any yet.
I would also second replacing the 7805 first but I would also take a look at the big filter cap. I've seen them go bad based on some of the NESes that I've worked on; I even had one that was bulging at the top so it was obviously bad. Sometimes the caps inside the RF/AV box go bad which happened with another NES I had.