LG NP7550 - LGV500 Mobile Disassembly

3-10
ELECTRICAL TROUBLESHOOTING GUIDE
4. PAIRING BLUETOOTH
5. KEY/ LED
Pairing Bluetooth.
Key, LED
OK
Connect FFC.
Check power.
Check DSP.
Check DSP.Replace Bluetooth module.
Check power.
Check DSP (Replace IC501).
Check the connection of FFC.
Is input voltage 3.4 VA?
(L501)
Is BT_RST HIGH?
(R504)
Is voltage of L500 3.4 V?
Is control HIGH?
(KEY: R542, 515, 524, 535)
(LED: Pin3 of Q500 ~ 507)
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
If it still doesn’t work