Grounding Of Display Frame - Nokia RH-77 Troubleshooting Manual

2118 (RH-77)
Antenna Description and Troubleshooting

Grounding of Display Frame

Grounded screw
RF connector
Grounded screw
Note that the display frame is grounded to the PWB through the two top screws. The
grounding of the display frame impacts the radiation performance of the mobile
terminal.
• If the screws are loose, then tighten them.
• If the screw bosses are stripped, replace the chassis.
• If the screws are missing, install new ones.
The middle screws should not touch the metal in the LCD frame, the metal shield over
the keypad, the PWB, or the RF shield. When driving in these screws, be sure to drive
them in straight. If the screws are driven in at an angle, it is much more likely that the
screws will touch the PWB or the RF shield. If the screws touch, the antenna
performance could change by about 1 dB.
Page 6
Figure 6: Display assembly
©2005 Nokia Corporation
Nokia Customer Care
Ungrounded screw
Ungrounded screw
Company Confidential Issue 01 04/2005