Sound (Portable Function) - LG SJ3 Service Manual

3. NO SOUND (PORTABLE FUNCTION)
3-1. Solution
Replace IC508 or portable jack (JK500).
3-2. How to troubleshoot (Countermeasure)
1) Please check the soldering status of JK500.
2) Please check L507, L508 (PORT_L, PORT_R signal) of portable jack (JK500).
If you can't find input signal, replace JK500.
3-3. Service hint (Any picture / Remark)
ONE POINT REPAIR GUIDE
L507 L507
L508 L508
< Portable circuit >
L508 L508
L507 L507
< MAIN board top view >
3-4
JK500 JK500