LCD Pixel Failure Repair

A common problem with the E34´s instrument clusters is with time the LCD pixels start to fade away just like the one in the picture below.



The problem may be fixed by perchasing a new ribbon cable.



 The ribbon cable is connected from the dashboard circuit board to the LCD module.

Procedures

1. Open the back part of the instrument cluster ( fairly simple )

2. Take off the plastic coverings were the LCD module is located.

3. Remove the old ribbon cable from the LCD module and dashboard circuit board.

4. Wipe off any excess dirt from the LCD module were the old ribbon cable was connected and do the same with the dashboard circuit board. Be very carefull with the LCD module beacuse it cracks easily.

5. Now comes the tricky part. Look closely at the LCD module with a strong bright light and you will see a bunch of connectors. The grey lines you see on the ribbon cable have to bee aligned with the lines you see on the LCD otherwise it wont work. It requires a bit of patience so take you time.

6. Be very carefull with the LCD module because i cracked mine trying to connect the ribbon cable.


Hope this helps!!!!!