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50PZ570B-SB (CHASSIS:PB12A) - LG TV Service Manual (repair manual). Page 90

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N
Y
Check USB OCP IC(IC1200)
: OCD, CTL pin
Check Multi 5V voltage (L501)
N
Y
Check P1200
Replace P1200
Replace one bead(L501) & 
Recheck
N
Replace IC(IC1200) & 
Recheck
Y
Maybe IC101 has problems
Replace It 
18. Wi-Fi Trouble Shooting 
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