Definately not a bad solder joint. You can wiggle and tap the Analog board as much as you want, once it's ON no problem.
This will be a very time consuming job to get it repaired as I could not find the Schematics for the board ( it's the Internation, 240 Volts version, not the USA model ). I have one of a USA model but the layout is completely different. Resistors and capacitors have other numbers, even other values....
I'm afraid I have no other choice than using my spare board as reference to look for the problem. I also think it's a faulty transistor or resistor somewhere.
It's something I'm going to keep for next winter as it's too hot in my small workspace now. :-/