Motorola XT1225, XT1254 TROUBLESHOOTING GUIDE

XT1225/XT1254 BASEBAND TROUBLESHOOTING GUIDE

Sept 18, 2014

Motorola Mobility Confidential Proprietary

Sept 18, 2014

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Motorola Mobility Confidential Proprietary

TABLE OF CONTENTS

1.  Snapshots of Antennas ………………………..………………….………………………..... 3

2.  Snapshots/plots of Main Board .….…………….……………….………………..…………. 5

3.  Touch Troubleshooting……………...…….………………….……………………..……….. 9

4.  Display Troubleshooting…………….…….………………………………………..…….…. 15

5.  Audio Troubleshooting……………………………………………………………………….. 21

6.  No Power up Troubleshooting………………………………………………………………. 34

7.  Battery & Charger Troubleshooting……………………………………….………………... 47

8.  Sensors and SIM Troubleshooting …..……………………………………..……………… 55

9.  Camera Troubleshooting…………………………………………………………………….. 66

10.  BT & WiFi Troubleshooting……………………………………………………………………80

11.  NFC Troubleshooting……………………………………………………………….…………92

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Motorola Mobility Confidential Proprietary

SNAPSHOTS OF ANTENNAS

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Motorola Mobility Confidential Proprietary

GPS Rx Only

BT/WLAN Tx/Rx

Diversity Rx Only

Antenna Locations

Main Antenna Tx/Rx

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Motorola Mobility Confidential Proprietary

SNAPSHOTS/PLOTS OF MAIN BOARD

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Motorola Mobility Confidential Proprietary

Top Side (Display)

Bottom Side (Battery)

Snapshots of Main PCB

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Motorola Mobility Confidential Proprietary

WTR1625L

PM8084

APQ8084

+ RAM

eMMC

Rear

Camera

ZIF

Headset /

Vibe ZIF

SIM Socket

Headset IC

Display and touch

Connector

USB

Power Key

Vol up key

Vol down key

Main Board – Top Placement

PROX

Sensor /

ALS

MDM9x25M

PM8019

SMB1359

QCA6164

BCM20795

STM32F401

TFA9890

MPU-6515

MMPA

WFR1620

RFFE

TMS320C5545

WCD9320

Mic 1

Mic 4

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Motorola Mobility Confidential Proprietary

Main Board – Bottom Placement

Battery Con.

MIC 2

Loud Spk

Contact

Front

Camera

ZIF

Flash LED pogo pins

MIC 3

MIC 5 (not used)

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Motorola Mobility Confidential Proprietary

TOUCH TROUBLESHOOTING

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Motorola Mobility Confidential Proprietary

Display ZIF

Touch ZIF

Main Board – Location of LCD and touch ZIF connectors

TSB ZIF

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Motorola Mobility Confidential Proprietary

Capacitive Touch Block Diagram

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Motorola Mobility Confidential Proprietary

Display/Touch Connector

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Motorola Mobility Confidential Proprietary

Touch IC Schematic

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Motorola Mobility Confidential Proprietary

1. No Touch response when display touched

•  Swap display panels with known good panel. If touch works, problem with display flex or IC (Go to 3). If still not working, problem with main board

(Go to 2).

2. Main Board Issue

•  Check touch connector for proper insertion of flex.

•  Ensure 3.2VDC power is at the display ZIF.

•  Verify Reset signal is high, IRQ is high.

•  I2C Data and I2C Clock at 1.8VDC.

3. Display panel issue

•  Check Touch flex for any damage.

•  Ensure 3.2VDC and 1.8 VDC supplies are at the touch ZIF.

•  Verify Reset signal is high, IRQ is high, I2C Data and Clock at 1.8VDC.

•  When touching panel, INT should toggle low, I2C data and clk will toggle.

Touch Troubleshooting

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Motorola Mobility Confidential Proprietary

DISPLAY TROUBLESHOOTING

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Motorola Mobility Confidential Proprietary

•  This display is a color Active Matrix Organic Light Emitting Diode (AMOLED) of glass construction with White pixels on a Black background.

•  The display consists of high density pixels with a color depth of 16.7M colors (24 bpp). The display interface is two MIPI DSI ports MIPI in

command mode.

•  Chip-on-glass (COG) with the driver located at bottom front of panel.

•  2 LEDs on flex for android key backlighting.

•  Display operates in MIPI command mode with onboard RAM.

Display

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Motorola Mobility Confidential Proprietary

61-pin display

ZIF connector

Display Module

Main PCB

Assembly

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Motorola Mobility Confidential Proprietary

Display Main Schematic

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Motorola Mobility Confidential Proprietary

Pin45~49 of J5300; Vbat from C5314

Pin4 of J5300; Vddio from C5317

Pin3 of J5300; Vddio from C5320

Pin44 of J5300; RST from E5333

Power-up Sequence

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Motorola Mobility Confidential Proprietary

•  Check 61pin display ZIF connector

1.  Properly inserted

2.  Any damage to ZIF receptacle on main PCB or plug on disp flex tail

3.  Swap in known good main PCB or good disp module to see if issue follows main PCB or display flex

•  If the issue follows main PCB

1.  Check DISP_B_PLUS (Vbat) voltage (3.15 to 4.4VDC) at Pin45~49 of J5300

2.  Check DISP_VIO voltage (1.8VDC) at Pin4 of J5300

3.  Check DISP_VCI voltage (3.1VDC) at Pin3 of J5300

4.  Check above 3 voltages after phone power up. If they are not turned on, check them during phone power up.

•  If the issue follows display module, replace the module.

Display Troubleshooting

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Motorola Mobility Confidential Proprietary

AUDIO TROUBLESHOOTING

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Motorola Mobility Confidential Proprietary

Quarternary Microphone

Port

Loudspeaker

Port

Front View

Back View

Earpiece Port

Top View

Primary Microphone port

Secondary Microphone

Port

Quinary Microphone

Port

Tertiary Microphone

Port

Audio Devices

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Motorola Mobility Confidential Proprietary

Microphone

Mesh Assembly

Headset jack flex

connector

Primary (left) &

Quarternary (right)

mic & grommets

Loudspeaker Gasket

Earpiece speaker

(32 ohms)

Audio Devices (PCB View)

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Motorola Mobility Confidential Proprietary

Tertiary (left) &

Quinary (right)

mic and grommet

Earpiece pogo

connector

Loudspeaker

spring contacts

Secondary

Microphone

Port

Microphone

Mesh Assembly

Secondary

Microphone

& Grommet

Loudspeaker

(8 ohms)

Earpiece

Flex

Headset

Jack

Audio Devices (PCB View)

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Motorola Mobility Confidential Proprietary

•  Launching the CQA app will help resolve and root-cause the vast majority of problems

•  Go to the phone/dialer and enter *#*#2486#*#*

•  The CQA main menu will pop-up – select “Start CQA Test in Menu Mode”

•  Select the appropriate debug area – for Audio, primarily you will use AUDIO and HEADSET

•  The AUDIO CQA area has test capability for both mics, earpiece and loudspeaker

•  The HEADSET CQA area should be used to debug any detection, or lack of audio on the headset jack path

CQA Application

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Motorola Mobility Confidential Proprietary

•  The CQA apk can be used to verify a broken audio path. Under the “Audio” menu, select “Mic Loopback”.

–  The “PRIMARY MIC” setting allows a mic1 to earpiece loopback (recommended)

•  Note* - The “DEFAULT MIC” setting also allows this, if a headset device is not plugged in.

–  The “SECONDARY MIC” setting loops mic2 to the earpiece, and so on. –  *NOTE* The “SECONDARY MIC LPA” path does not exist in HW and will not

loopback any audio.

•  If both of those are not functional, the earpiece speaker path is likely damaged. In the “AUDIO” menu of the CQA apk, select “Ear Speaker” and then “Play Harvard speech pattern” and/or “Buzz Sweep”.

•  The loudspeaker can be tested by selecting “Loudspeaker” via the CQA apk. A musical composition should start playing and be easily heard.

•  If audio is not present on the HEADSET path, select the “Headset” entry in the main menu of the CQA app, then plug-in the headset device to view whether the lack of audio is a

detection-cycling issue or other anomaly.

“No Audio” Complaints

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Motorola Mobility Confidential Proprietary

Microphones

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Motorola Mobility Confidential Proprietary

If a mic is not functioning…

•  Check to make sure the microphone and mic ports are not blocked.

•  Check to make sure the mic gasket and mic grommets are seated properly.

•  Check the microphone for diaphragm debris indicating a shattered diaphragm. Look under a microscope to view inside the microphone port for damage or debris.

•  Check to make sure none of the capacitors on the mic lines are shorted or damaged.

•  Check the mic bias C4500 (Mic1), C4510 (Mic2), C4520 (Mic3), C4530 (Mic4), C4540 (Mic5). The mic bias should be 2.8V when the microphone is enabled.

•  If the failure is no microphone audio, check mic loopback through CQA at the board level with a display connected. (Mic loopback may be easier to check with a headset plugged in)

•  If there is no audio during mic loopback, inject a 35mVrms, 1kHz sine wave onto the MIC_IN_P side of C4501 (Mic1), C4511 (Mic2), C4521 (Mic3), C4531 (Mic4), C4541 (Mic5) and listen for the tone during loopback. If you can hear the tone now, you know either the mic is bad, or there’s a process defect with the mic-to-PCB connection.

•  X-ray the mic to check for process defects.

•  If there is an issue with Mic5 LPA path, also check U6281 and the components around it for process defects.

Microphones Troubleshooting

Sept 18, 2014

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Motorola Mobility Confidential Proprietary

•  Check that the impedance of the earpiece speaker is 32 ohms, and that the spring contacts are not bent.

•  Check that the earpiece flex is seated properly in the top carrier with no debris on it. You should also be able to see slight imprints in the gold pads where both the speaker contacts and PCB pogo contacts were touching the flex.

•  Check that the earpiece pogo connector on the PCB is seated properly with no bent or stuck pogos.

•  Check that L4690 and L4691 are not damaged or skewed. Also check C4691, C4692, C5790, VR4690 and CR4691 for any placement issues.

Earpiece Speaker (Handset Mode DOWNLINK)

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Motorola Mobility Confidential Proprietary

•  Verify the impedance of the loudspeaker is 8 ohms.

•  Verify the loudspeaker gasket is placed correctly.

•  Lack of mechanical contact should also be checked (bent loudspeaker pins on PCB).

•  Make sure L4680 and L4681 are not skewed or damaged.

•  Check C4684, C4680, C4681, C4682, C4683, VR4680, and VR4681 for any placement issues.

Loudspeaker

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