LG L240 Service Manual page 63

4. TROUBLE SHOOTING
START
Power is supplied to
the board?
Yes
Connection between
FPCB and boards is OK?
Yes
CN601 is soldered well?
Yes
Paths of LCD control
signals are OK?
Yes
FPCB OK?
Yes
After changing the board,
LCD Display is OK?
Yes
The BackEnd is broken.
Change the board
No
First of all, push a key pad then check 1.8/2.8V check Points during a Key pad LED ON.
No
No
No
You must push a key pad for a watching signals.
No
No
- 64 -
Refer to
Power On Trouble
Reconnect FPCB
Re-solder the CN601
Re-solder
the EMI filter
Replace the FPCB
The LCD is broken.
Change the LCD.