Verilux Lamp repair

[jerryk]

I'm trying to fix a friends Verilux Led Smart Light that just quit working.  When circuit board is out of the plastic enclosure pictured below you can get it to turn on by touching the contact springs but it behaves very erratic, blinking, and switching modes on it's own.  When I test the controller side of C3 the voltage was very unstable.  I removed the capacitor at C3 and now the light performs closer to how it should work.  The light stays on, behaves in a stable manner, but only one of the brightness buttons works.  When I put the circuit board back in the plastic enclosure the power button works but no other buttons are functional.

It seems like I'm on the right track but not sure the problem is solely the capacitor or if there is a malfunction in the microcontroller itself.  Any ideas on how I should go about trouble shooting this?

The C3 capacitor that I removed measures 5.5 nF.  I don't have a replacement for it so I put a 10 nF to see if it would fix the situation.  It did not.  Any ideas on what kind of microcontroller that is and what the original capacitor should be rated at?

Also, I have never dealt with that kind of touch sensitive button setup.  It seems based on resistive touch.  Any info on this would be appreciated too.

Thanks in advance for the help.

Jerry