3-3
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Only for training and service purposes
LGE Internal Use Only
No REG 5.0V
Check or Replace the D123
YES
YES
NO
Check or Replace the Q126
Is the Vcc(=5.6V)
supplied to Q126
Collector?
Check the ‘PWR CTL “H”’
signal from µ-com
YES
NO
Is the Vcc(=12V)
supplied to Q126
Base?
ELECTRICAL TROUBLESHOOTING GUIDE
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•
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No 12V
Check or Replace the D125
YES
YES
NO
Check or Replace the Q123
Is the Vcc(=14V)
supplied to Q123
Collector?
Check the ‘PWR CTL “H”’
signal from µ-com
YES
NO
Is the Vcc(=12V)
supplied to Q126
Base?
•
•
•
•