The G R E inserts seem to be having something of a Ghosting issue in my TAF. Any suggestions? I'm using non Ghosting LEDs. Thanks guys!
Temporarily remove the LED and use a #555 bulb and test the lamps.
Next, swap LEDs from adjacent socket.
Observe what happens.
Check the voltage coming off the PDB PCB of the feature lamp circuit.
Check the specific lamp boards for cold solder cracking.
Test the individual lamp diodes for proper operation.
Check the sockets for age corrosion.
It is a one or combination of these reasons.
Bad LEDs with improper internal circuit can also be the simple cause.
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