LG KM500 Service Manual page 70

Power is supplied to
Connection between
FPCB and boards is OK?
Connectors are soldered well?
Paths of LCD control
signals are OK?
After changing the board,
LCD Display is OK?
Change the board
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the board?
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 watching signals.
FPCB OK?
Yes
Yes
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4. Trouble Shooting
No
Power On Trouble
No
Reconnect FPCB
No
Re-solder the
No
No
Replace the FPCB
No
The LCD is broken.
Change the LCD.
Refer to
Connector
Re-solder
the EMI filter
LGE Internal Use Only