LG KG200 Service Manual - Page 26

Key Function Problems, Data Communication Problems

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4. Troubleshooting Key Function Problems Make a general visual inspection for corrosion or oxidation from liquid damage. Turn the phone on. Go to service test menu; choose "5.Keypad". Press all the buttons. The pressed key will be shown in the Main display. Check that the mechanical response feels normal and that all the keys had been shown in the Main display. Replace the Metal dome If necessary (Fig.8.1.). Check that the mechanical response feels normal and that all the keys had been shown in the Main display. Clean the key pads If necessary (Fig.8.2.). Fig.8.1 Fig.8.2 Data Communication Problems If no communication is accomplished with the system connector: Make a general visual inspection for corrosion or oxidation from liquid damage Check that the system connector (Fig.9.1.) is incorrectly soldered, not mechanical damaged, dirty or oxidized. Replace it if necessary. Fig.9.1 - 27 -

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4. Troubleshooting
- 27 -
Key Function Problems
Make a general visual inspection for corrosion or oxidation from liquid damage.
Turn the phone on. Go to service test menu; choose “5.Keypad”. Press all the buttons. The pressed
key will be shown in the Main display.
Check that the mechanical response feels normal and that all the keys had been shown in the Main
display. Replace the Metal dome If necessary (Fig.8.1.).
Check that the mechanical response feels normal and that all the keys had been shown in the Main
display. Clean the key pads If necessary (Fig.8.2.).
Data Communication Problems
If no communication is accomplished with the system connector:
Make a general visual inspection for corrosion or oxidation from liquid damage
Check that the system connector (Fig.9.1.) is incorrectly soldered, not mechanical damaged, dirty or
oxidized. Replace it if necessary.
Fig.8.1
Fig.9.1
Fig.8.2