LG NP5550B - Sound in Portable Mode

3-3
ONE POINT REPAIR GUIDE
2-3. Service hint (Any picture/ Remark)
2. NO SOUND IN PORTABLE MODE
No sound problem occurs in portable mode.
2-1. Solution
Check and replace IC500 on main board.
2-2. How to troubleshoot (Countermeasure)
1) Check solder of JK300.
2) Check if signal enters pin2 and pin7 of IC500.
3) Check if signal comes out from pin63 ~ 66 of IC500.
 If it doesn’t work, replace IC500.
4) Check if signal comes out from CN700 L+, L-, R-, R+.
 If it doesn’t work, replace IC700.
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IC500
IC500
JK300
JK300
CN700
CN700
IC700
IC700