Hdr Part; Electrical Troubleshooting Guide; Power Supply On Smps Board - LG RH1757 Service Manual

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER SUPPLY ON SMPS BOARD

No 5.3VA
YES
Is the F101 Normal?
YES
Is the BD101 Normal?
YES
Is the R101 Normal?
YES
Is the Vcc (13V - 27V)
supplied to IC101 Pin2?
YES
Is the D128 normal?
YES
Is there about 2.5V at the
IC103 Pin1?
YES
Is the IC102 normal?
YES
Is the D121 Normal?
YES
Is the D122 Normal?
YES
Is the D125 Normal?
YES
Is the D124 Normal?
YES
Is the D127 Normal?
YES
Is the D126 Normal?
YES
Power Line of I/O PCB
is short

HDR PART

NO
Replace the F101
(Use the same Fuse)
NO
Replace the BD101
NO
Replace the R101
NO
Is the D102 normal?
NO
Replace the D128
NO
Replace the IC103
NO
Replace the IC102
NO
Replace the D121
NO
Replace the D122
NO
Replace the D125
NO
Replace the D124
NO
Replace the D127
NO
Replace the D126
3-2
NO
Check or Replace the
D102