LG KM710 Service Manual - Page 62
Re-solder the FB304, FB305Main
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4. Trouble Shooting START I/O Connector (CN300,Main) Is well-soldered? YES Check the FB304,FB305(Main), Is it OK? YES Voltage at pin 1,2 of U101(Main) =4.8? YES Voltage at pin 5 of U101(Main) Is LOW in case charging ? YES Battery is OK? YES Charging is operating properly Re-solder the CN300 NO (Pin 12,13) Re-solder the FB304, FB305(Main) NO Replace the U101(Main) NO The IC out of order. NO Replace the IC The Battery may have Problem. Change Battery NO CN300 U101 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes - 63 - LGE Internal Use Only
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- 63 -
4. Trouble Shooting
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
Re-solder the CN300
(Pin 12
,13)
START
I/O Connector (CN300,Main)
Is well-soldere
d?
Check the FB304,FB305(Main),
Is it
OK?
Voltage at pin 1,2 of U101(Main)
=4.8
?
Voltage at pin 5 of U101(Main)
Is
LOW in case charging
?
Battery is OK
?
Re-solder the FB304, FB305(Main
)
Replace the U101(Main
)
The IC out of
order.
Replace the
IC
The Battery may have
Problem.
Change Batter
y
Charging is operating prope
rly
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
U101
CN
300