Due to supply chain issues, the exact physical replacement power supply is no longer available. In order to keep repairs of the Omnia 11 possible, we have developed a power supply replacement procedure that allows the use of different power supply models. All are our Part# 1281-00078-100.
This document will describe the replacement procedure for new approved power supply models CUI VOF-450C-12-CNF and MEAN WELL RPS-400-12-C. For the sake of brevity, they will be referred to as the “CUI power supply” and the “MEAN WELL power supply,” respectively.
You will need a the packet of 4 new screws with nuts (included), a Philips screwdriver, a hex driver, a pair of pliers and some RTV sealant.
Step 1: Identifying the power supply you were sent
First, identify which model of power supply you received. The CUI power supply can be identified by a label on the top of the power supply, near the DC power output screw terminals. The MEAN WELL power supply can be identified by a label on the side of the power supply. The labels will contain both their respective manufacturer's name and model numbers.
Step 2: Removing the old power supply
Step 2a: Disassembling the Omnia 11
Remove power from the Omnia.11. Unscrew and remove the top cover. Locate the power supply area, on the front-left of the chassis, near the left side heatsink. Unscrew and remove the shielding: On the outside, using a hex screwdriver, remove the four screws shown below, which are holding the power supply plate onto the side of the Omnia 11. Keep these screws for later. Make sure to note the orientation of the insulation sheet (between the backing plate and the chassis relative to the backing plate).
Step 2b: Removing the cabling
Unscrew the two DC output terminals and remove the cabling. Disconnect the AC power input connector. Unscrew the grounding cable and P-clamp on the side of the power supply.. Remove the power supply (and backing plate) from the chassis.
Unscrew the four screws on the backing plate holding the power supply. Remove the power supply. Make sure to note the orientation of the sheet relative to the backing plate.
Step 3: Adapting the replacement power supply
Due to slight differences between the original power supply and the approved replacement power supplies, a slight modification is required to the AC input connector for proper fit.
Step 3a: Removing the tab on the power supply AC power input connector
On the power supply, locate the AC power input connector, located on the opposite side of the DC power output screw terminals. Using pliers, tear off the white plastic tab on the edge of the connector. Be careful not to bend the pins or tear off the entire connector!
Clean it up with a file if necessary. Make sure to clean up any excess plastic sticking up upon the flat part of the connector. Any excess can plastic can interfere with proper seating.
Step 3b: Removing the screws of the power supply
On the power supply, remove the four screws in each corner holding the board and chassis together. Discard three of the screws, but keep at least one for later. It will be re-used in step 5a to attach the grounding cable.
Step 3c: Attaching the power supply to the backing plate
Place the power supply on top of the insulating sheet, on top of the backing plate. Make sure the insulating sheet is oriented (relative to the backing plate), so that the screw holes line up.
CUI power supply only: Place the power supply onto the backing plate aligned such that the vented side (with the circular holes) is flush with the edge of the backing plate, as shown above.
MEAN WELL power supply only: Place the power supply onto the backing plate aligned such that the vented side (the side without the label) is flush with the edge of the backing plate, as shown above.
Using 4x M3x35mm Philips flat-head 18-8 screws (1301-00250-100), screw the replacement power supply onto the backing plate. The screws should go through the power supply in the opposite direction that the original screws went in, as shown above.
Fasten 4x M3 hex 5.5x2.4mm nuts (1303-00025-100) onto the screws, to hold the PCB and the chassis in place on the power supply, as shown above.
Step 4: Attaching the cabling to the new power supply
Step 4a: Attaching the DC power output terminals
This step differs slightly between the two power supplies; make sure to only follow the step for your specific power supply.
CUI power supply
Attach the DC power output cabling to the screw terminals on the other side of the power supply. Connect the yellow wires (positive) to the terminal labeled +Vo, and the black wires (negative) to the terminal labeled -Vo, as shown on the label.
MEAN WELL power supply
Attach the DC power output cabling to the screw terminals on the other side of the power supply. Connect the yellow wires (positive) to the terminal labeled +V, and the black wires (negative) to the terminal labeled -V. The labels are hidden behind the terminals, so it may be hard to see them. The positive terminal should be on the left side, and the negative on the right (next to the LED), when looking at the power supply from the terminals.
Make sure that the terminals on the cable are not touching. It should not happen, but the area is very tight. Make sure to tighten the terminals, so the cables do not slip around.
Step 4b: Attaching the AC power input connector
The two power supplies have different orientations for the AC connector, so it is important to only follow the step for your specific power supply.
CUI power supply
Connect the two-wire AC power input connector to the power supply’s AC input. Orient the connector such that the tab is facing outwards, with the black wire going to live (L) and the white wire going to neutral (N). Place RTV adhesive to secure the connector in place, where shown in the image below.
Wait for the RTV adhesive to dry enough to keep the connector in place before continuing.
MEAN WELL power supply
Connect the two-wire AC power input connector to the power supply’s AC input. The labels for the AC inlet on these power supplies are hidden underneath the PCB, so they are not visible without disassembling it completely. The neutral connection is the pin closest to the edge.
Orient the connector such that the tab is facing inwards, and the contacts are facing outwards. Place RTV adhesive to secure the connector in place, where shown in the image below.
Wait for the RTV adhesive to dry enough to keep the connector in place before continuing.
Step 5: Installing the new power supply
Step 5a: Attaching the backing plate
In the Omnia 11 unit, install the power supply backing plate into the proper position. Orient it such that the AC connection is facing towards the screen and the DC connection is facing away from it, as shown in the image below. Make sure that the insulating sheet is oriented on the back of the backing plate as it was initially, and sandwiched properly between the heatsink and the backing plate.
Using the four hex screws originally used for the backing plate (removed in step 2a), screw the backing plate back into the unit. Make sure the cables to the power supply are running beside the power supply or underneath it.
Using one of the screws from the power supply (removed in step 3b), attach the grounding cable to either screw hole on the side (facing up) of the power supply, as shown in the image below.
Step 5b: Re-assembling the Omnia 11
Attach the shielding (removed in step 2a) back in place, as shown below. Only screw in the two side screws, the replacement power supply does not have screw holes that mate with it. The two screws will hold it firmly in place.
Place the lid back on the Omnia 11 and screw it in using all screws.
Return the Omnia.11 to service.