LG SH4 - Sound adjustment; Setting sound effect

3-7
ONE POINT REPAIR GUIDE
5. NO BLUETOOTH
5-1. Solution
Replace IC502 on MAIN bottom board. (No 3.3 V)
5-2. How to troubleshoot (Countermeasure)
1) Please check externally status of bluetooth cable connection on your eyes.
(at CN508 and bluetooth module)
2) Please check 3.3 VA at FB503.
If 3.3 V is ok at FB503, please check BT_SDA, BT_SCL, BT_RST (pin53, 51, 25) of IC502 and BT_RX,
BT_TX (pin29, 27).
If you have no signal, please replace IC502.
5-3. Service hint (Any picture / Remark)
< MAIN board top view >
< MAIN board bottom view >
IC502
IC502
FB503
FB503
CN508
CN508