Atari Lynx has a power circuit that reduces the 9V DC input voltage (from a power brick or 6x AA batteries) to a 5V DC voltage that is then used internally by the electronics on the motherboard. That circuit makes use of a MOSFET and Zener diode, which after many years of operations are prone to fail and burn your Lynx out. So instead of worrying if your Lynx's MOSFET or zener diodes are going to fail, why not bypass them completely? This is exactly what this mod does. It takes a 5V DC input from USB using a micro-USB port and patches it directly into the Lynx past the 9V circuit.
You can buy this mod kit from our online store here.
The only downside of this mod is that the on/off buttons will no longer work. Plugging in a USB cable will switch the Lynx on immediately and unplugging it will switch it off. Because of this, I like to use a USB power bank that has its own on/off switch.
Lynx Model 2 has two metal strap loops on the back, under the "ATARI" logo. These were never actually used for anything as far as I know, but they are a perfect fit for a micro-USB port. First you will need to disassemble your Lynx. With the Lynx in two halves, take the rear part of the shell and unscrew the metal strap loop on the right (when looking at the back of the Lynx).
Then, using a scalpel or Exacto knife (or you can use a rotary tool if you like), remove the ridge of plastic that the metal loop was pushing up against. See photo for reference.
Once the strap loop space is cleared out, insert the PCB with the USB socket as pictured. You may need to cut out more on the sides around where the strap loop was. The PCB and 3D printed cover should slide in easily when you get the cutout right.
Make sure the PCB is flat against the inside of the Lynx shell (you may need to hold it). Using a 2.5mm drill bit, drill out a hole in the Lynx case that lines up with the screw hole in the PCB and 3D printed cover. Clean up any plastic shavings left over after drilling the hole.
Push the screw through the outside of the case, through the PCB and the 3D printed cover, so that it's visible on the inside of the case. Tighten the nut on the screw. You can use a 2.5mm Allen key or just tighten it as much as you can using your hands. Don't tighten too hard to avoid cracking the plastic.
You will need to split the end of the power cable into two - red and black wires. Then strip the ends of the wire and tin them using a soldering iron. Then look at your Lynx's motherboard and find the C41 capacitor, it should be in the top-right corner (when looking at the back of the Lynx motherboard). This is the capacitor we need to solder the wires from the USB PCB to. The +ve side of the capacitor is marked on the motherboard, but should be closest to the edge. Solder the wires in as per the photo below. Red goes to positive, black goes to negative.
Use a USB power supply or a USB battery bank with a micro-USB connector to test your mod. You will need to have at least a 1A USB power source. If you're using a McWill LCD modded Lynx, you will need to have more than 1A to avoid the power LED on the Lynx from flashing. Plug in a micro-USB cable into your Lynx and USB power source, your Lynx will power on immediately. There is no on/off functionality when using this mod as mentioned earlier.
Once everything is working, re-assemble your Lynx and enjoy!