3-4
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only for training and service purposes.
< MAIN board top view >
< MAIN board bottom view >
CN902
CN902
CN901
CN901
L710
L710
IC906
IC906
IC702
IC702
IC701
IC701
IC100
IC100
IC700
IC700
CE700
CE700
ONE POINT REPAIR GUIDE
3. NO SOUND IN BLUETOOTH MODE
No power problem occurs when you power on the unit.
3-1. Solution
Check and replace.
3-2. How to troubleshoot (Countermeasure)
1) Check if BT is in pairing state with your device.
2) Check connection of CN901/CN902 and Battery.
3) Check battery voltage of CN901/CN902, Pin 1. (It should be 6.5 V ~ 8.4 V)
If voltage is not check, change Battery.
4) Check signal out, Port10 ~ 12 (I2S) of IC100 (BT Module).
If signal is not check, check to AMP IC (IC700/IC701).
5) Check voltage L710(3.3 V), CE700(6.5 ~ 13.8 V) of AMP IC (IC700/IC701).
If voltage is not check, check to IC (IC702, IC906).
3-3. Service hint (Any picture/ Remark)
