Test with a multimeter

RGB LED

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Now: Red chip

CircuVanta 6000 counts · auto range DCAUTO•)))HOLDFUSE− HOLD LIGHT OFFV⎓V~Ω•)))FmA⎓ mA400 mACOMVΩ Red (R) 1 R Common cathode 2 K Green (G) 3 G Blue (B) 4 B
Pin 1: Red (R) (R) Pin 2: Common cathode (K) Pin 3: Green (G) (G) Pin 4: Blue (B) (B)

Red probe Not connectedBlack probe Not connected

Hold the probe and drag it to the tip of a leg. Tapping works too: first pick the probe, then the leg.

Set the range to diode test.

Measure step by step

This guide uses a common-cathode RGB LED: the common pin (2) is the cathode, the red probe goes to a color pin and the black probe to the common pin. Try the three colors one by one; with a common-anode LED you would reverse the probes. The matching color glows faintly while you measure.

  1. 1Red chip
  2. 2Green chip
  3. 3Blue chip
  4. 4Reverse direction: red on the common leg