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50PH4700-SD, 50PH470H-SA (CHASSIS:PB32A) - LG TV Service Manual (repair manual). Page 95

Read LG 50PH4700-SD / 50PH470H-SA (CHASSIS:PB32A) Service Manual online

17. WIFI-B/I
Check Wifi Cable
Y
Check 3.3V voltage level at
N
Replace one of
L4302
L4302& Recheck
Y
Check  USB interface DP/DM
N
Replace one of
Main Chip(IC105)& Recheck
Maybe WiFi module
has problems. Replace It.
Y
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