LPS communication wire disconnected from the Lamp Power Supply.

Reconnect the LPS wire (reference 3 image) with the LPS module.

LPS communication wire disconnected from Signal Backplane.

Reconnect the LPS wire (reference 4 image) with the Signal Backplane.

Note: To access the socket on the Signal Backplane the Lamp Cathode has to be removed. See service manual chapter "Replacement of the Lamp Cathode Fan".

Malfunction LPS module. The orange LED (Heartbeat) of the LPS is not blinking.

Replace the whole LPS module. See service manual chapter "Lamp Power Supply (LPS)".

Defect Signal Backplane.

Replace the Signal Backplane. See service manual chapter "Signal Backplane replacement process".