A22 - Blank GUI Display or White Vertical Lines

Tools Needed:
Phillips screwdriver #2
11/32” Nut driver
1/16” thick or 1/8” thick two-way foam tape

To fix this you will need to follow the below steps. I suggest taking a picture of how the wiring is routed before disassembly.

1. Remove the 14 Phillips head screws mounting the top cover onto the GUI main body (Both sides and front) and place the cover to one side.

2. Mark the two black and white connectors for the Inverter with a permanent marker and remove. The marks are to associate the tops of the connectors.

Note: These two black and white connectors can be installed in either connector on the board, so marking them for position is mandatory.

3. Mark the top of the brown connector on the left hand side of the Inverter with a permanent marker and remove.

4. Unplug the black display cable, and the grey 1” wide video ribbon cable from the small video board in the lower left hand side.

5. Remove the GUI keypad ribbon cable. This cable has a locking tab that needs to be depressed to separate them.

6. Lay the GUI cover to the side and remove the three 11/32” nuts that are holding the mid plate cover onto the lower GUI base.

7. Once the mid plate cover is off, you will see the grey ribbon cable that you have disconnected earlier from the top area is connected to the bottom board in the back. This 'Viper board' as it is called, is the Motherboard. Notice in the below picture that there is no double sided tape and the Ferrite core is loose.

8. The ferrite core is connected to the video cable. There are times the core has come loose or has not been connected to the rear wall of the GUI to secure it. It should be secured to the back wall like in the picture below.

Note: You may find the video cable connection off of the Viper board. Reconnect this cable to the Viper board.

9. Secure this Ferrite core so that it will not put weight on the video cable you will need a 1” x 1” x 1/8” thick double sided adhesive foam strip to install on the Ferrite core.

10. Mount it to the back wall keeping the cable as loose as possible.

11. Install everything back in the reverse order. You may need to check the mid plate to see if there is a small piece of foam tape in the right hand corner of the slot for the video cable. If this foam strip is not there please add a piece to this corner so that the video cable does not rub against the mid plate in that corner. This could cause the cable to short and loss of video also. 

Note: When re-installing the mid plate be sure that the cable routing is correct, the cables have certain areas to route and will need to go into the same spot.

Note: When installing the cover make sure the keyboard ribbon cable is not hanging outside the cover, this may cause the cover to pinch the ribbon cable and fail the keyboard. It likes to squirt out the side.

12. Install the screws and power up the GUI.