Does the light illuminate of you ground the blue-red wire at the lamp socket lug?
(Topic ID: 264691)
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Quoted from chuckwurt:The socket is grounded. I even tried a separate ground wire from the socket to the ground braid with no joy.
The common braid wire connected to the base of the lamp socket is 5.4VDC feature lamp power, not ground. The lamp driver board switches the ground path on the individual wire.
So what happens when you ground the brown-black wire?
Quoted from chuckwurt:So that silver wire that connects all sockets together is not ground?
That silver wire connected to the base of all the feature lamp sockets is POWER. Do not ground it!
Quoted from chuckwurt:I have no idea how to ground the socket. Connect it to the ground braid in the cabinet?
Yes. Jumper a wire from the ground braid in the cabinet to the brown-black wire on the lamp socket. If the lamp doesn't illuminate, your problem is local to the lamp/lamp socket. If it illuminates, your problem is wiring from the lamp driver board or an issue with the lamp driver board itself.
Confirm your grounded jumper wire at a working lamp socket first to make sure the jumper wire has good connectivity to ground.
Quoted from chuckwurt:So how can I rule out if the board pin is bad?
Next step, ground the anode leg of the SCR driving that lamp. Find SCR Q14 on the lamp driver board and jumper the anode leg to ground. If the lamp does not illuminate, there is an open circuit from that SCR anode leg to the connector and beyond. If it does illuminate, then Q14 may be suspect. Further checks can be done on Q14.
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