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