LG KM710 Service Manual - Page 74
Power On Trouble
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4. Trouble Shooting START Power is supplied to No the board? Refer to Power On Trouble Yes First of all, push a key pad then check 1.8/2.8V check Points during a Key pad LED ON. Connection between No FPCB and boards is OK? Reconnect FPCB Yes No Connectors are soldered well? Yes Re-solder the Connector Paths of LCD control No signals are OK? Re-solder the EMI filter Yes You must push a key pad for a watching signals. No FPCB OK? Yes After changing the board, No LCD Display is OK? Yes Replace the FPCB The LCD is broken. Change the LCD. Change the board Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 75 - LGE Internal Use Only
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- 75 -
4. Trouble Shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
STAR
T
N
o
Power is supplied to
the board?
Ye
s
Refer to
Power On Trouble
Connection between
FPCB and boards
is OK?
N
o
Reconnect FPCB
Ye
s
Connectors
are soldered well?
N
o
Re-solder the
Connector
Ye
s
Paths of LCD control
signals are OK?
N
o
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.
Ye
s
FPCB OK?
N
o
Replace the FPCB
Ye
s
N
o
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
Ye
s