The service manual is a good quality scan of the Panasonic NV-850, which is electrically identical to the Philips VR 6920, but mecanically just nearly.
The service manual is a good quality scan of the Blaupunkt RTV-404, which is electrically and mecanically identical to the Panasonic NV-830.
Text excerpt from page 9 (click to view)
TK-7108H
DISASSEMBLY FOR REPAIR
1. When you remove the panel, turn the transceiver up side down. Detach the panel by lifting the tabs as shown below.
Tabs
3. To remove the display unit PCB, detach the PCB by lifting at the indents of the PCB as shown below.
Indents
Fig. 1 Fig. 3
2. To remove the cabinet, first turn the transceiver up side down. Detach the cabinet by prying the tabs as shown below.
4. When mounting the front panel, match the 4 tabs of the chassis with the panel, being sure they attach securely.