LG KG300, Service Manual

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4. Troubleshooting
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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 “6.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. Check the keypad connecter. (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