No Usb - LG LAB550H Service Manual

7. NO USB

When unit is connected to USB, no audio and video from SET.
7-1. IC501 (MT8553)
7-1-1. Solution
Replace IC501 (MT8553).
7-1-2. How to troubleshoot (Countermeasure)
1) Check JK241 pin soldering.
2) If there is short soldering on JK241 , re-soldering JK241.
3) If problem still occurs, check 5V (JK241 pin1).
- If no output, check MAIN board IC158.
- If OK, check D+, D- signal.
- If there is no signal, replace IC501.
7-1-3. Service hint (Any picture / Remark)
JK241 JK241
IC158 IC158
ONE POINT REPAIR GUIDE
< MAIN board top view >
2-39
IC501 IC501