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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
No 5V for HDD & DVD drive
Is there about 5.5V at
the IC156 Pin 1?
Check D125 and replace
YES
YES
NO
Is there about 4V ~ 5V at
the IC156 Pin 4?
Check the “PWR CTL‘H’”
signal from µ-COM
YES
NO
Check the IC156 and replace
No 12V for HDD & DVD drive
Is there about 13.5V at
the IC155 Pin 1?
Check D124 and replace
YES
YES
NO
Is there about 4V ~ 5V at
the IC155 Pin 4?
Check the “PWR CTL ‘H’”
signal from µ-COM
YES
NO
Check the IC155 and replace