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VX8350
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Only for training and service purposes
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4.4.3 Checking Bluetooth In/Out and Power Supply Circuit
Checking Flow
Checking Flow
TP1 Check C304
Similar to bellow Graph 1.1?
Start
NO
NO
YES
Press “##5473784236368” + “SEND”+ “000000” in Phone idle state
Press “5” FCC Test
Press “3” Bluetooth FCC
Press “8” DUT mode
Spectrum analyzer setting, Oscilloscope setting
Check Bluetooth Intenna or
Antenna Matching Network
TP2 Check Pin10 of U302
+2.6V_MSMP2 is OK?
YES
The Problem may be Logic Part
Refer to Logic Troubleshoot
TP3 Check Pin14 of U302
+2.8V_BT is High OK?
YES
TP4 Check Pin9 of U302
NO
The Problem may be PMIC
Refer to PMIC and Replace U401
Similar to bellow Graph 1.2?
NO
The Problem may be RF Part
Refer to RX Troubleshoot
YES
Replace U302
Graph 1.1
Graph 1.2
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