LG RH265 Service Manual page 16

ELECTRICAL TROUBLESHOOTING GUIDE
No 12V
YES
Is the 13.5V
supplied to IC155 pin1?
YES
Is the IC155 pin4 "H"?
YES
Check or Replace the IC155
No 5V
YES
Is the 5.5V
supplied to IC156 pin1?
YES
Is the IC156 pin4 "H"?
YES
Check or Replace the IC156
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Only for training and service purposes
NO
Check or Replace the D124
NO
Check the DVD CTL 'H'
signal from µ-com
NO
Check or Replace the D125
NO
Check the DVD CTRL 'H'
signal from µ-com
3-3 LGE Internal Use Only