[old_tv_nut]

1) It looks like the power is supplied as half-wave rectified AC through X11, so the DC reading doesn't tell the whole story.
2) The schematic doesn't give two sets of voltages, one with color present and one for black and white. Since the waveforms show color, I'd presume these are the voltages for the lights being on, but again it's not clear if the emitter of Q2 has plain DC or pulsating DC. 2 V DC is not going to be enough for the LEDs.
3) LEDs, like all diodes, have a sharp turn on, so trying to match the voltage is not good practice. Instead, you should look at the difference between [EDIT] the emitter of Q2 [END EDIT] and the diode drop and install a current limiting resistor in series with each LED.
4) In this circuit you are served a curve ball if all the voltages are pulsing half-wave rectified. Checking with a scope would be a good idea.