LG KE590 Service Manual page 63

4. TROUBLE SHOOTING
Check is the CN202(main key)
Is well-soldered?
R210(main key)
Is well-soldered?
Check is the connection of
Main key, Main, Main FPCB ?
Check the Main FPCB
Main FPCB is OK?
U103( Main) check ?
Booting is operating properly
LGE Internal Use Only
START
YES
YES
YES
YES
YES
R210
CN203
Re-solder the CN203(main key)
NO
Re-solder
R210(main key)
NO
Connect the Main key, Main, Main FPCB
NO
Replace Main FPCB
NO
Replace the U103(Main)
NO
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