Here is the main PCB of the C64 DTV, along with the On/Off switch and Fire buttons, which have their own PCBs.
The positioning of the PCB is, of course, upside-down and backwards, but that’s OK.
The V+ and V- wires came from the V+ and V- connectors from the battery box on the lower portion of the joystick case. There is a large version available for your viewing pleasure by clicking the link below marked “original”.
For more great, high-res pictures of the various innards and assemblies, click out the VICUG Photo Gallery