L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE 1 OF 21 PAGES
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Table of Contents
Diversity Antenna …………………...…….…………….…. 2
BT/WiFi ……………………………………….……..….……. 6
GPS ……………………………………….………..….……. 12
Main Antenna ………………………….………….………. 16
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Diversity Antenna
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Objective / Purpose:
● Studying radiated failures and providing procedure for debugging the failures
● The following tests from RADTEST section of the NTF_Pareto document will be discussed
Here are the Verizon SKU Failure List (Secondary, C3): Verizon Secondary
• QC_LTE_BC7_C1_RX_RAD_RSSI_HCH3400
• QC_LTE_BC13_C1_RX_RAD_RSSI_LCH5184
• QC_CDMA_800_C1_RAD_RSSI_HCH
• QC_CDMA_1900_C1_RAD_RSSI_HCH
Verizon CDMA Primary
For factory radiated test failure on secondary path (Note C1 in the test code), please do the following:
Step 1: Retest
Step 2: If Step 1 does not resolve issue, check if universal contact (RefDes = M850) on the PCB
is damaged. Is it touching the antenna pad? If the universal clip is twisted or not making contact,
this needs to be replaced:
Figure 1: Universal contact for secondary antenna
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Step 3: If Step 2 does not resolve the problem check if components RefDes = L850, L899, L852,
L854, C856, L855, C855, L857, L858, L898 and C860 are placed correctly on PCB as shown
below in figures 2 and 3.
Figure 2: Antenna matching components, universal clip, & RF connector for secondary
antenna
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Figure 3: Secondary antenna matching components schematic
Step 4: If Step 3 does not resolve the problem, check if the ground clips M013 are placed on the
board and making contact as shown in Figure 4.
Figure 4: Bottom Ground Clip On the PCB
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BT/WiFi
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Objective / Purpose:
● This document helps debug Bluetooth and 2.4 GHz / 5 GHz WIFI factory radiated test failures.
Setup:
● Schematic
● PCB Layout
● The following list are the tests from RADTEST section of the NTF_Pareto document
! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH165
! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH149
! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH165_CL
! WLAN_5.0GHZ_RAD_MEAS_POW_STATUS_LCH149
! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH149_CL
! WLAN_2.4GHZ_RAD_MEAS_CW_POW_LCH01
! WLAN_2.4GHZ_RAD_MEAS_CW_POW_HCH13
! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH036_CL
! WLAN_2.4GHZ_RAD_MEAS_CW_POW_MCH06
! WLAN_5.0GHZ_RAD_MEAS_CW_POW_LCH036_MID
Ant.%contact%
L016%
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Analysis:
● Bluetooth / WiFi 2.4GHz
○ BT_RAD_MEAS_CW_POW_CH_00
○ WLAN_2.4GHZ_RAD_MEAS_CW_POW_LCH01
○ WLAN_2.4GHZ_RAD_MEAS_CW_POW_HCH13
○ WLAN_2.4GHZ_RAD_MEAS_CW_POW_MCH06
Step 1: Retest
Step 2: Check for cracks in the WiFi antenna pattern
Cracks will only be visible under a microscope. A known “good” top carrier should be placed and
the phone should be re-tested.
Step 3: Check if antenna C clip contact on PCB is missing, damaged or not making good
contact with antenna. The contact should look like this picture below:
Check&antenna&cracking&
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Step 4: Check if antenna is matching components RefDes C014 (0 ohm), C015 and L016 are
intact.
Check&antenna&contact&C&clip&
Ant.%contact%
L016%
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Step 5: Check if PCB to chassis grounding M0019 intact and making good contact.
%
M0019%
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● WiFi 5GHz
WLAN_5.0GHZ_RAD_MEAS_CW_POW_
o LCH165
o LCH149
o LCH165_CL
o STATUS_LCH149
o LCH149_CL
o LCH036_MID
o LCH036_CL
When 5 GHz radiated Wi-Fi test failed, most likely it is conducted problem, if conducted circuit
was confirmed to be good, please follow the same steps as Wi-Fi 2.4G to debug.
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GPS
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Objective / Purpose:
This document helps debug GPS factory radiated test failures
○ GPS_CARRIER_TO_NOISE
Setup:
● Schematic
● PCB Layout
%
C056%
Ant.%Contact%
%
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Analysis:
Step 1: Retest
Step 2: check for cracks in the GPS antenna pattern
Cracks will only be visible under a microscope. A known “good” top carrier should be placed and
the phone should be re-tested.
Step 3: Check if antenna C clip contact on PCB is missing, damaged or not making good
contact with antenna. The contact should look like this picture below:
Step 4: Check if antenna matching components RefDes C056 and L056 are intact.
L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE 15 OF 21 PAGES
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Step 5: If the Carrier-to-noise is several dB lower than the spec, check if the PCB around the
hole has crack or not.
Step 6: If the C/N is more than 15dB lower than spec, check if the RF connector is aligned with
solder pads and if the center pin soldered well. The resistance between 2 center pins of RF
connector should be 0 ohm.
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Main Antenna
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Objective / Purpose:
● Studying radiated main antenna failures and providing procedure for debugging the failures
● The following tests from AUDIORAD station
Here are the various test cases for the Verizon SKU Failure List (Primary, C2): Verizon Primary
● QC_LTE_BC13_C0_TX_RAD_POW_23230
● QC_LTE_BC4_C0_RX_RAD_RSSI_HCH2350
● QC_LTE_BC04_C0_TX_RAD_POW_20000
● QC_LTE_BC07_C0_TX_RAD_POW_20800
● QC_CDMA_800_C0_RAD_RSSI_HCH
● QC_CDMA_1900_C0_RAD_RSSI_HCH
● QC_WCDMA_1900_C0_TX_RAD_POW_9671
Verizon CDMA Primary
For factory radiated test failure, please do the following:
Step 1: Retest
Step 2: If retest does not pass, check if the unit has the bottom antenna carrier assembled
correctly. The Quantum bottom antenna carrier should look like Figure 1. Make sure all the
screws to hold the bottom carrier are placed.
Figure 1: Quantum Bottom Antenna Carrier
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Step 3: if Step 2 does not resolve issue, check if universal contact (RefDes = M650) on the PCB
is damaged. Is it touching the antenna pad? If the universal clip is twisted or not making contact,
this needs to be replaced:
Step 4: If Step 3 does not resolve the problem check the following components for each test
failure (component placement shown in figures 2 and 3):
● QC_LTE_BC13_C0_TX_RAD_POW_23230
● First check: C107, U651, L663, C656, C654
● If all intact and soldered well, check: C651, L655, C670, C653, L652, L651, U630,
R9008, and R9009
● If all intact and soldered well, check: L656, L658, L660, C127, U653, U655, R9010,
and R9011
● QC_LTE_BC4_C0_RX_RAD_RSSI_HCH2350
● First Check: C656, C654, U653, C127, R9010, and R9011
● If all intact and soldered well, check: L663, L656, L658, L660, and U655
● If all intact and soldered well, check: C651, L655, C670, C653, L652, L651, C107,
U630, U651, R9008, and R9009
● QC_LTE_BC04_C0_TX_RAD_POW_20000
● First Check: C656, C654, U653, U655, C127, R9010, R9011
● If all intact and soldered well, check: L663, L656, L658, L660, and C127
● If all intact and soldered well, check: C651, L655, C670, C653, L652, L651, C107,
U630, U651, R9008, and R9009
● QC_LTE_BC07_C0_TX_RAD_POW_20800
● First Check: C656, C654, U653, U655, C127, R9011
● If all intact and soldered well, check: L663, L656, L658, L660, C127, and R9010
L3 Radiated Troubleshooting Guide XT1225/XT1254 PAGE 19 OF 21 PAGES
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● If all intact and soldered well, check: C651, L655, C670, C653, L652, L651, C107,
U630, U651, R9008, and R9009
● QC_CDMA_800_C0_RAD_RSSI_HCH
● First check: C107, U651, R9009, L652, L655, L663, C656, L656, C654
● If all intact and soldered well, check: C651, C670, C653, L651, U630, and R9008
● If all intact and soldered well, check: L658, L660, C127, U653, U655, R9010, and
R9011
● QC_CDMA_1900_C0_RAD_RSSI_HCH
● First Check: C651, C656, C654, U653, U655, C127, R9011
● If all intact and soldered well, check: L663, L656, L658, L660, and R9010
● If all intact and soldered well, check: L655, C670, C653, L652, L651, C107, U630,
U651, R9008, and R9009
● QC_WCDMA_1900_C0_TX_RAD_POW_9671
● First Check: C651, C656, C654, U653, U655, C127, R9011
● If all intact and soldered well, check: L663, L656, L658, L660, and R9010
● If all intact and soldered well, check: L655, C670, C653, L652, L651, C107, U630,
U651, R9008, and R9009
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Figure 2: Main Antenna matching components overlay – Rear components
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Figure 3: Main Antenna matching components overlay – Front components
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