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3-2
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
VDR PART
ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER SUPPLY ON SMPS BOARD
No 5.3VA
YES
Is the F101 normal?
Replace the F101 (Use the same fuse)
YES
NO
Is the BD101 normal?
Replace the BD101
YES
NO
Is the R101 normal?
Replace the R101
YES
NO
Is Vcc (13V ~ 27V)
supplied to IC101 pin2?
Is the D102 normal?
YES
NO
Is there about 2.5V at
the IC103 pin1?
Replace the IC103
NO
Check or Replace the D102
Is the D128 normal?
Replace the D128
YES
NO
YES
Is the IC102 normal?
Replace the IC102
YES
NO
Is the D121 normal?
Replace the D121
YES
NO
Is the D122 normal?
Replace the D122
YES
NO
Is the D125 normal?
Replace the D125
YES
NO
Is the D124 normal?
Replace the D124
YES
NO
Is the D127 normal?
Replace the D127
YES
NO
Is the D126 normal?
Replace the D126
YES
NO
Power Line of Main PCB is short
NO