LESSON SUMMARY: Summary: This lesson is designed to assist the user in understanding the cause of an OEM Network VP® Timing Mechanism display having a functioning backlight but no visible text or data.

Special Tools Needed: None

⚠ CAUTION: THIS LESSON MAY INCLUDE INSTRUCTIONS TO TEST HAZARDOUS VOLTAGES (120V-240V) THAT CAN CAUSE SERIOUS INJURY OR DEATH. IT IS RECOMMENDED THAT A LICENSED ELECTRICIAN BE CONTRACTED TO PERFORM SUCH TESTS.

🛑 STOP: ALWAYS TURN OFF THE POWER TO THE SATELLITE BEFORE REMOVING OR INSTALLING COMPONENTS.

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If an OEM Network VP® Timing Mechanism has no visible display, but it still has a functioning backlight, and appears to be running programs as normal, the Timing Mechanism likely has a damaged contrast circuit. To test the Timing Mechanism, proceed with the following steps:

Start by powering off the satellite using the On/Off rocker style switch located on the front of the Power Supply Assembly.

Next, using a Phillips screwdriver, unscrew the mounting screws used to hold the Network VP® in place. There will be four screws: one in each corner of the Timing Mechanism.

Unplug the 40-Pin Cable from the base of the Timing Mechanism.

Remove the Network VP® Timing Mechanism and take it to a known-working satellite location to test. 

*Note: Prior to installing the Timing Mechanism at a known-working satellite location, be sure to power off the satellite at the known-working satellite location. Power to the satellite should always be off before installing or removing components.

Install the Timing Mechanism at the known-working satellite location, making sure to plug the 40-Pin Cable at the known-working satellite location into the base of the Timing Mechanism.

Power the satellite on.

If the Timing Mechanism is not displaying any text or data when installed in a known-working satellite location, the Timing Mechanism is damaged and should be replaced.

Replacement SuperParts™ Timing Mechanisms for Network VP can be purchased here.