Lighted LED base repair

[RichO]

Hello all,

I have this lighted LED base for a crystal display that belongs to my mother. Last year one of the LEDs stopped working and then the other 2 changed behavior.

Originally it slowly changed colors but now just the red and green LED's stay lit and the green one gets a little dim and comes back.

I am wondering if this would be possibly a bad LED or could it be something else.

I was thinking of buying 3 replacement LEDs but it doesn't seem like there is anything in the circuitry that makes them blink slowly and it's the LEDs themselves that have the blinking circuitry built in.

Any input would be appreciated. Thanks!

 

[duke37]

I think the black blob is the 'driver'.
If the leds stay lit, this is not turning the current off. Bad news !
The leds work so are OK.

 

[RichO]

Testing with a multi meter the current to each LED slowly cycles between 0.8 VDC and 2 VDC. The non-working LED also gets this current so I would assume the blue LED simply went bad. Would I be correct?

Thanks

 

[duke37]

You did not say anything about a blue led. You should take it out and test it and replace if faulty.

Temporarily tacking on a led of any colour will determine if the circuit is working.