It is your TV module that is not fully compatible with the 16:9 display.

Try the battery disconnect all over again. Then, if that does not work, try removing the TV module from the car and see if that fixes things. You may just need to buy a newer TV module that is compatible with the 16:9 display.

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input