A look at Nikon CP5700 Internals, looking for the Flash failure culprit.
Full details at www.digsys.com.au/n5700/n5700.html
UPDATE: Decided to have another look at the problem and after 8 hrs of surgery, we now have 3 CONFIRMED cases of a BADLY soldered Stacking connector (thanks to ssj(ssj@mail.tascom.ru) ).. The S/Mount connector was actually located at an angle on the PCB and the poorly wetted solder simply fractured. The entire CPU PCB had in fact VERY poor /and frosty soldering.
To make matters worse, of the 3 PCBs that are stacked, the Flash control PCB literally floats in free air. Its a HECK of a job to get the camera apart, but it definitely can be done. One day I'll write up the FULL disassembly guide.