Your LED lights do not change color possibly due to a bad pin connection or faulty pin. A bad pin connection also includes a backward connection or reversed polarity. LED strip lights usually have 2 sides: one side has a positive charge (noted with a dash) and the other side has a negative charge (usually noted with the manufacturer’s logo).
Here are a few things that could be causing the problem: Loose contact with bulb holder. This is a relatively easy fix- simply remove the bulb and screw it back in tightly. Check that the connections in the bulb holder have not been bent too far in after years of use and now not touching the lamp base.
If the meter jumps all the way to the right or reads OL, which means open line, the fixture is bad. The Light Socket Has Power but the Bulb Won't Light If your voltage or continuity test shows that the fixture is working but the bulb won't light, try another bulb. If that doesn't work, the problem is probably corroded terminals.
Mostly, when one or more diodes in an LED bulb go bad, the whole bulb refuses to work because of limitations in circuitry. You can rule out the possibility of faulty LEDs in the LED array of your light bulb with visual inspection or by using a multimeter.
If there is no problem, turn off the power and check the internal parts of the lamp such as capacitors, drivers, etc. Reason 1. For poor quality capacitors or drivers: replace them yourself if you can or hire an electrician to help you. Or if they are too difficult to repair or replace, you can also replace the LED bulb. Reason 2.
YES. Unlike traditional incandescent bulbs, modern LED bulbs allow for almost everything to be repaired. What you need to do is to find out the problem and take reasonable action to repair, or replace some damaged parts of the LED bulb, your lamp can work properly again.