LG SJ3 - Bluetooth Connection Lock (BT Lock)

3-6
ONE POINT REPAIR GUIDE
5. NO BLUETOOTH
5-1. Solution
Replace IC501 on MAIN board.(No 3.3 V)
5-2. How to troubleshoot (Countermeasure)
1) Please check externally status of Bluetooth cable connection on your eyes.(at CN504 and Bluetooth module)
2) Please check 3.3 V at L509.
If 3.3 V is OK at L509, please check BT_RST, BT_CLK, BT_DAT, UART_RX, UART_TX of IC501 (pin27,
23, 24, 67, 68).
If you have no signal, please replace IC501.
5-3. Service hint (Any picture / Remark)
< Bluetooth Interface circuit >
< MAIN board top view >
IC501
IC501
L509
L509
L509
L509
CN504
CN504
CN504
CN504