LG 55WT30MS Service Manual page 24

9. NO RASTER STATE ON USB Input
NO RASTER STATE ON
USB INPUT
CHECK input Signal
Of JK706/JK707
NO
CHECK IC1006/IC1007 Vcc 5V ?
YES
1. CHECK IC4
2. CHECK Vcc OF IC4 AND PERIPHERALS
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Only for training and service purposes
1. Check the kind of Contents Codec whether Display can support or not
YES
2. Check USB Device type
* Certain USB Hard type Device requires too much Power and Display sometimes can not play contents
NO
1. Check IC1006/IC1007 and Check IC4 USB Control
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LGE Internal Use Only