This assumes you already know how to fully break down your system.
1) Remove "MOD RF" box. Best to desolder the 5 pins on the actual back of the RF modulator board instead of at the NES motherboard. This prevents traces getting lifted.
2) Bridge orange and red lines on power switch board.
3) Solder USB ground to where shield of the RF modulator was soldered to. Also check that voltage has not been reversed before step 4! Unplug USB from power.
4) Solder USB +5V to pin going to brown wire on power switch board's connector.
5) Before applying power, double check that the switch is turning the NES on and off, using an ohm meter. Do continuity/visual checks for solder bridges or wrong connections.
6) If no cart is in it, and the CIC chip hasn't been disabled, then when powered up, the LED should blink on and off. Finally a good use for that circuit! XD
7) Add replacement video amp to the video output. Nearest the cartidge port, among those 5 pins that used to go to the RF modulator, is the (needing amplification) video output from the PPU. This goes to the input of your replacement amp. The output goes to an RCA connector, and the ground and VCC lines should be obvious by now. (VCC/+5V is the middle pin of the old RF modulator's connector, ground is the shield)
8) Audio can be sent directly to your TV but you might want to add an amp and headphone connector, as well.
The USB plug should be going to charger and not to a PC directly. This is especially true if you're using a lot of controllers and a Flash cart! For similar reasons, don't use micro-USB sockets. A male end of a (full-sized) USB extension or a female type-B socket is recommended.
NESp notes about the big-honking-box: http://nesp.tighelory.com/construction/chapter_3/page1.shtml
An example of the replacement video amp (NES2, but similar): http://longhornengineer.com/2011/07/19/ ... schematic/
Cleaner schematic, skip the stereo mod nonsense: http://console5.com/wiki/Nintendo_NES-1 ... dification
And again for the NES2: http://www.gamesx.com/rgbadd/nes2avmod.htm
Schematic of the real video amp is here: http://www.neshq.com/hardgen/ (schem2) and here(much cleaner): http://console5.com/wiki/File:NES-001-S ... Switch.png
One I'm trying: http://nesp.tighelory.com/images/nesp_amplifier.gif
1) Remove "MOD RF" box. Best to desolder the 5 pins on the actual back of the RF modulator board instead of at the NES motherboard. This prevents traces getting lifted.
2) Bridge orange and red lines on power switch board.
3) Solder USB ground to where shield of the RF modulator was soldered to. Also check that voltage has not been reversed before step 4! Unplug USB from power.
4) Solder USB +5V to pin going to brown wire on power switch board's connector.
5) Before applying power, double check that the switch is turning the NES on and off, using an ohm meter. Do continuity/visual checks for solder bridges or wrong connections.
6) If no cart is in it, and the CIC chip hasn't been disabled, then when powered up, the LED should blink on and off. Finally a good use for that circuit! XD
7) Add replacement video amp to the video output. Nearest the cartidge port, among those 5 pins that used to go to the RF modulator, is the (needing amplification) video output from the PPU. This goes to the input of your replacement amp. The output goes to an RCA connector, and the ground and VCC lines should be obvious by now. (VCC/+5V is the middle pin of the old RF modulator's connector, ground is the shield)
8) Audio can be sent directly to your TV but you might want to add an amp and headphone connector, as well.
The USB plug should be going to charger and not to a PC directly. This is especially true if you're using a lot of controllers and a Flash cart! For similar reasons, don't use micro-USB sockets. A male end of a (full-sized) USB extension or a female type-B socket is recommended.
NESp notes about the big-honking-box: http://nesp.tighelory.com/construction/chapter_3/page1.shtml
An example of the replacement video amp (NES2, but similar): http://longhornengineer.com/2011/07/19/ ... schematic/
Cleaner schematic, skip the stereo mod nonsense: http://console5.com/wiki/Nintendo_NES-1 ... dification
And again for the NES2: http://www.gamesx.com/rgbadd/nes2avmod.htm
Schematic of the real video amp is here: http://www.neshq.com/hardgen/ (schem2) and here(much cleaner): http://console5.com/wiki/File:NES-001-S ... Switch.png
One I'm trying: http://nesp.tighelory.com/images/nesp_amplifier.gif