LG KM710 Service Manual page 74

Power is supplied to
the board?
Connection between
FPCB and boards is OK?
Connectors are soldered well?
Paths of LCD control
signals are OK?
FPCB OK?
After changing the board,
LCD Display is OK?
Change the board
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Only for training and service purposes
START
Yes
First of all, push a key pad then check 1.8/2.8V
check Points during a Key pad LED ON.
Yes
Yes
Yes
You must push a key pad for a watching signals.
Yes
Yes
No
No
No
No
No
No
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4. Trouble Shooting
Refer to
Power On Trouble
Reconnect FPCB
Re-solder the
Connector
Re-solder
the EMI filter
Replace the FPCB
The LCD is broken.
Change the LCD.
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