LG L240 Service Manual page 69

4. TROUBLE SHOOTING
MOD
MOD Signal Pin Voltage OK?
Yes
Connection between
Main FPCB and LCD Module/Main Board
is OK?
Yes
Main FPCB OK?
Yes
The ABB(Triton) is broken.
Change the board
No
Initial state is 1.8V. If you push a button, pin voltage must drop below 1.5V.
No
No
- 70 -
Replace or Rework the MOD FPCB
Check resistor(R128) on mainboard.
Check voltage at the R128.
It Must be 1.8V.
Reconnect FPCB
Replace the Main FPCB
R128