Troubleshooting For Function Key - Hisense LTDN50K3801UWTRU Service Manual

5.2 Troubleshooting for Function Key

Buttons does not work
Check switches
NO
Check key board
NO
Check Key BD cable
Change Key BD
NO
Replace main board
YES
Check solder connections and
see if any switches are stuck.
YES
Replace Key BD
YES
OK
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