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22LS5400, 22LS540T (CHASSIS:LD02M) - LG TV Service Manual (repair manual). Page 14

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TROUBLE SHOOTING
1. No Power
Check  L800 All
Voltage Level (19V)
Check Power connector
OK ?
Replace Adapter
N
N
Check IC802 output
Voltage Level (5V)
Replace IC802 &
Recheck
N
Check  IC2602 Output
Voltage Level (3.3V_ST) 
Replace  IC2602
N
Y
Check  IC806 Output
Voltage Level (1.24V) 
Replace  IC806 &
Recheck
N
Y
Y
Check  IC810 Output
Voltage Level (2.5V) 
Replace  IC810 &
Recheck
N
Y
Check  IC807 Output
Voltage Level (1.5V) 
Replace  IC807 &
Recheck
N
Y
Check X201 Clock
24MHz
Replace X201
N
Replace IC100 Flash Memory
Y
Y
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