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50PZ570B-SB (CHASSIS:PB12A) - LG TV Service Manual (repair manual). Page 86

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N
Y
Check I2C (R1005, R1006) 
N
Replace resister (R1005,R1006)
& Recheck
Y
Maybe IC101 has problems
Replace It (Only PK950)
Check 17V voltage (Q1001)
N
Y
Check JK1001
Replace JK1001
Replace one FET(Q1001) & 
Recheck
16. Wireless Trouble Shooting 
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