No Sound In Portable Mode - LG NP8350 Service Manual

2. NO SOUND IN PORTABLE MODE

No sound problem occurs in portable mode.
2-1. Solution
Check and replace IC801 on main board.
2-2. How to troubleshoot (Countermeasure)
1) Check solder of JK401.
2) Check input voltage of IC801 (L801, L802).
  L801 should be 3.3 V, L502 should be 5 V.
3) Check if signal enters pin13 and pin14 of IC801.
Check if signal comes out from pin8 and pin9 of IC801.
  If it doesn't work, replace IC801.
2-3. Service hint (Any picture/ Remark)
ONE POINT REPAIR GUIDE
IC801 IC801
< Main board top view >
< IO board top view >
JK401 JK401
3-3