I have an American DJ Dual Gem Led disco light which is faulty.
When i power on the unit all the led lights turn on and dont change or go to the beat of the music.
Initially the voltage regulator broke off so i replaced this with a new one.
Attached is a circuit diagram for an American DJ Dual Gem Led disco light and also a picture of the printed circuit board front and back.
If using or making measurements on this board, be aware it provides no mains isolation so is potentially (no pun intended) LETHAL.
There is a component labelled 'Re 10k' apparently missing from next to the heatsink and fat cap C6.
Diodes D5 and D8 have some crud at their ends. Have you checked them (also D6, D7)?