Funny enough, reminds me of repairing a very very expensive Bioptron lamp, which I bought on auction on a whim, because it was cheap, and I thought it looked cool. Automatic mains voltage selection, which they achieved in a rather interesting way. Light provided by a very well designed and built SMPS that did the input AC rectification, smoothing and conversion to 12V DC very nicely, just needed a startup supply to power the control electronics in it, which also was used to power the timer for the unit. 100W halogen lamp, and a cooling fan for it.
Powering the low power digital timer was the interesting supply, they wanted a power supply that was universal, which the main lamp power supply certainly was capable of handling, but they did not want to put ( or were size constrained on the board by then) a small switcher in, so instead they put a simpler method. Not capacitive dropper, but instead they put in a 230VAC to 24VAC 2VA potted transformer, and a bridge rectifier on the output, and a 470uF 63V capacitor. All pretty common, and then they put the voltage regulator, a single zener diode, 12V 0.4W, a resistor from the supply to feed it around 1mA (22k) and a Zetex darlington, which was expected to dissipate over 1W in the 230V position. On a 120V supply the regulator still works, providing a nice 12v rail and only having a tiny power dissipation, but on 230V it ran hot enough to discolour the board. Fault was that on 230V the transformer was somewhat overloaded, and burnt out. Google told me, via translate, that the transformer failing, along with the little Zetex transistor melting itself off of the pcb, was a common fault.
Little Zetex was fine, just somewhat changed colour wise from the original, with brown instead of white printing. Transformer was open circuit on the primary, and looking underneath the potting was somewhat cooked. Replaced it with a 12V one, and drilled a single new mounting point for it to fit the one leadout, and it works fine. Still sitting unused, no need for a lamp that has snake oil all over it, and which makes a good room heater, and a very inefficient polarised light source.