LG KM710 Service Manual - Page 67

LCD Display is OK?

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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 LGE Internal Use Only - 68 - Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes

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- 68 -
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