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Motorola A3100 Troubleshooting Manual
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Motorola A3100 Troubleshooting Manual

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A3100 Troubleshooting
A3100 Troubleshooting
Guide
Guide
Service Engineeing & Optimization
Level 3 , Rev.1.0

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Summary of Contents for Motorola A3100

  • Page 1 A3100 Troubleshooting A3100 Troubleshooting Guide Guide Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 2 Agenda N. ActiveSync No Function A. Cannot Power On O. Earphone Malfunction B. SIM Card Not Found P. Microphone Malfunction C. Display Abnormal Q. Receiver No Key Tone D. No Keypad Backlight R. Speaker No Function E. No LCM Backlight S.

  • Page 3: Can't Power On

    Can’t Power On (1) 1. Check the voltage of the Battery Vbat (TP170) > 3.8V 2. Check the battery connector J2 Vbat (TP170) N_KB_PWR_KE Vbat (J2) Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 4 Can’t Power On (2) 3.Check the voltage of R79 R79 > 3.4V 4. Check the power-on key path N_KB_PWR_KEY (TP165) > 2.6V If N_KB_PWR_KEY is low, the unit will power on. > 2.4 V > 3.4 V Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 5 Can’t Power On (3) 5. Check PM7540(U2) regulator voltage A. VREG_MSMC1_1.2V on C4923 D.VREG_MSME2_2.8V on C4921 B. VREG_MSMC2_1.2V on C4924 E. VREG_MSMP_2.6V on C4912 F. VREG_MSMA_2.6V on C4906 C. VREG_MSME_1.8V on C4925 Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 6 Can’t Power On (4) 6. Check Power On Sequence After the voltage rails are brought up, PON_RST_N is asserted by PM7540 IC, and then the MSM7200A IC asserts PS_HOLD signal. – PS_HOLD should be high after power on (on D522) Service Engineeing &...
  • Page 7 Can’t Power On (5) 7. Try to check the external DDR and Nand Flash External DDR check _ Check the External DDR by ram test tool Pass=> The External DDR is workable Fail => a) MSM7201A can find the memory b) U3 is damaged 2.
  • Page 8 SIM Card Not Found 1. Do the clean boot (Mater Clear) 2. Exam whether the contact between SIM and connector is ok 3. Check the Signal of SIM interface (VCC, RST ,and Clock) USIM ,VCC =1.8V ; SIM= 1.8V / 2.85V VREG_UIM1 USIM SLOT 4.
  • Page 9 Display Abnormal • White screen: • Check LCM damage or not • Check EMI filter (U4721) SMT • Check panel voltage VDD 2.8V(C4921_1) & VDDIO 2.6V(C4918_1) Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 10 No Keypad Light • Check keypad LED voltage VREG_5V(C259 pin2) • Check LED damage or not Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 11 No LCM backlight • No backlight: 1. LCM backlight damage 2. Measure R54 voltage: 15V 3. Backlight enable GPIO(Q1_2) pulled high 2.6V Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 12 Flash Light No Function • Can’t turn on flash light: 1. Check flash LED (D523) SMT and damage or not 2. Check D523_pin1 voltage: 5V 3. R425_1 & R426_1 & R427_1 pulled to low when turn on flash led. Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 13 Light Sensor No Function – Check U39_2 voltage: 2.8V – Check R685_1 signal pulled to low – Measuring Vout voltage (U39_4) was change or not when light sensor putting on different Lux environment. Service Engineeing & Optimization Level 3 , Rev.1.0...

  • Page 14: Cannot Charge

    Cannot Charge (1) 1. Check the battery and the charger ; Only support BT-60 battery 2. Dial #06# to check the Charging status and the charging type Power Source should be USB or Charger Battery ID : Readable If Power source is “No external power”, please check the charging path VBUS >...
  • Page 15 Cannot Charge (2) • If Battery ID is not the readable , please check whether battery is BT60 and contact to PIN3 OF J2 • BATT_THERMAL_GAUGING VREG_HKADC_2.85V n.m. VBATT 40mil BATT+ R147 DATA BATT_DATA_1 THERM 100R BATT- 476150001 4P P2 MOLEX BATT_THERM 4 n.m.
  • Page 16 Cannot Charge (3) 3. Dial #77704# to check the gas gauge Status AC Line : On (Has detect the charger) Flag : Charging (The charger driver is active) The current is minus, please check U604 circuit. Should be < 4.3V in charging Should be <...
  • Page 17 Keypad No Function 1. Check S/B connector J13 Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 18 Touch No Function – Check TP damage or not – Check assembly between main PCB and sub PCB – Check J13 SMT Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 19 Jog Ball No Function • 1. Check the magnet is at the correct position JOG_2.85V C322 33pF 0201 • 2. Check the voltage (JB1-10 =2.85V) Jog_RIGHT • 3. Check the related circuit GPIO_40 (2.6V) RCLAMP0521P Jog Left AN48840B Jog Up Jog_DOWN Jog Right GPIO_38 (2.6V)
  • Page 20 Can’t access the Micro SD Card • If the T-Flash card can not be detected, check if the pin12 of J16 is low. If not, check if J16 is OK. • If pin12 of J16 is low when inserted, check if pin5 of J16 is 3V. If not, check U2.
  • Page 21 Vibrator Out Of Control • Remove the lower case and have the vibrator exposed, then retest. • If retest OK after removing the case, reassemble and check if it is interfered by the case. • If retest still fail, check if pin1 of J11 is 5V. If not, check if U2 is working normally.
  • Page 22 ActiveSync No Response • 1. Do the clean boot (Master Clear) • 2. Check the USB transceiver circuit while the unit has connected to 1.8V Reset in High Level 19.2MHz 3.3V Vbus > 4.3V Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 23 Earphone Malfunction (1) • Check if the voltage at Pin 1 of R148 is logic low, if not, check the audio jack J170 is OK and well-contacted with the main board. • Using the oscilloscope to see if the waveform is visible at U10 or U11, if visible at pin 4 but not pin 3, replace U10 or U11 with new chips.
  • Page 24 Earphone Malfunction (2) Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 25 Microphone Malfunction • Check if the voltage at C113 is 2V, if not, replace U2 with a new chip. • Check if the voltage at Pin 4 of J3 on sub board is 2V, if not, check if the sub board is well-contacted with the main board, and if male and female BTB connectors are robust and clean.

  • Page 26: Receiver Malfunction

    Receiver Malfunction • Check if J6 is blocked by anything. • Using the oscilloscope to see if the waveform is visible at J6, if not, replace U1 with a new chip. • If the waveform is visible at J6, replace the receiver. Receiver Pads J6 Service Engineeing &...
  • Page 27 Speaker Malfunction (1) • Using the oscilloscope to see if the waveform is visible at C233, if not, replace U1 with a new chip. • Using the oscilloscope to see if the waveform is visible at L15 & L14, and the two waveforms should be out of phase with each other, if not, replace U2 with a new chip.
  • Page 28 Speaker Malfunction (2) Speaker Amp. Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 29 RTC failed • 1, Do a power cycle with the unit • 2. Check the Vcoin Voltage (BJ2) • 3. Check the 32KHz oscillator 1V~ 3V 32.768KHz Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 30 Can’t Take Picture • Can’t turn on: • Check Camera damage or not • Check camera module assembly • I2C interface working normally (you could verify this by LCD backlight level adjustment or turn on VGA camera) • Check camera power when turn on ( R178_1.8V, R751_2.8V, R752_2.6V ) •...
  • Page 31 3M Camera schematic and placement Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 32 Phone Hang Up • 1. Dump the image • 2. Copy the log in my device • 3. Perform the clean boot (press the end key and Jog ball before the power key in off mode) 4. If the unit can not into windows mobile, please redownload SW image to the damaged unit.

  • Page 33: Auto Power On

    Auto Power On 1. Please check the follow Power on event a) Press the power key ->Pull N_KB_PWR_KEY to low (TP112) On Page 4 b) Plug the USB charger /USB cable -> Detect VBUS Page 14, Page 15 , Page 16 2.

  • Page 34: Auto Power Off

    Auto Power off 1. 1. Check the leakage current (< 0.4mA) 2. if the power off is triggered by the power key, the vibrator will active for a while and then the unit is off. => Please check the SW2 power key. 3.
  • Page 35 Can’t call out (1) • Check the metal contact of antenna Antenna pad • Try to make call • Setup BS/MS parameter • Set HP8960, operating mode: test mode, test function: BCH+TCH, cell power:-60dBm • Set MS GSM900/850 ch62/189 PL=5; DCS/PCS ch699/ch661 PL=0 •...
  • Page 36 Can’t call out (2) • Check transmitter path – Check PA control signal • Use oscilloscope probe to touch red point and check waveform PA_EN PA_RAMP Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 37 Can’t call out (3) • Check transmitter path – Check ASM control signal • Use oscilloscope probe to touch red point and check control table Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 38 Can’t call out (4) • Check transmitter path – Check RF path power • Use spectrum probe to touch red point and check output power in High band RF signal spectrum analyzer Low band RF signal ~30dBm ~33dBm ~10dBm ~29dBm Service Engineeing &...
  • Page 39 Can’t call out (5) • Check receiver path – Check ASM control signal • Use oscilloscope probe to touch red point and check control table Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 40 Can’t call out (6) • Check receiver path – Check RF signal power • Use spectrum probe to touch red point and check output power in High band RF signal spectrum analyzer Low band RF signal ~ -65dBm ~ -65dBm ~ -61dBm Service Engineeing &...
  • Page 41 Can’t call out (1) WCDMA • Check the metal contact of antenna Antenna pad • Try to make call • Setup BS/MS parameter • Set MT8820, operating mode: test mode, cell power:-60dBm • Set MS WCDMA BC1 ch9750, BC2 ch9400 and BC5 ch4183 •...
  • Page 42 Can’t call out (2) WCDMA • Check transmitter path – Check PA control signal • Use oscilloscope probe to touch red point and check control table BC2/5 Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 43 Can’t call out (3) WCDMA • Check transmitter path – Check ASM control signal • Use oscilloscope probe to touch red point and check control table Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 44 Can’t call out (4) WCDMA • Check transmitter path – Check RF path power BC1 RF signal • Use spectrum probe to touch red point and check output power in BC2 RF signal spectrum analyzer BC5 RF signal ~26dBm ~26dBm ~26dBm ~24dBm ~24dBm...
  • Page 45 Can’t call out (5) WCDMA • Check receiver path – Check ASM control signal • Use oscilloscope probe to touch red point and check control table Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 46 Can’t call out (6) WCDMA • Check receiver path – Check RF signal power BC1 RF signal • Use spectrum probe to touch red point and check output power in BC2 RF signal spectrum analyzer BC5 RF signal ~ -68dBm ~ -68dBm ~ -68dBm ~ -65dBm...
  • Page 47 Bluetooth cannot turn on and test (1) • Check the voltages: VBATT, VREG_MSMP_2.6V, and V1P8_WLAN VREG_MSMP_2.6V V1P8_WLAN Test point: C1707 Test point: C302 Voltage: 2.6V Voltage: 1.8V VBATT Test point: C1706 Voltage: 3.4~4.2V Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 48 Bluetooth cannot turn on and test (2) • Check BT_REQ_OUT pin voltage. • When BT_REQ_OUT pulls high, OSC will have 19.2MHz clock. Test point: R1701 or R194 Voltage: 2.6V When BT turns on or is working, BT_REQ_OUT pin needs to pull high.
  • Page 49 Wi-Fi cannot turn on and test (1) • Check the voltages: VBATT, VREG_MSMP_2.6V, V1P2_WLAN, and V1P8_WLAN V1P8_WLAN VREG_MSMP_2.6V Test point: C302 Test point: C1707 Voltage: 1.8V Voltage: 2.6V VBATT Test point: C1706 Voltage: 3.4~4.2V V1P2_WLAN Test point: C1704 Voltage: 1.2V Service Engineeing &...
  • Page 50 Wi-Fi cannot turn on and test (2) • Check the reference clock 26MHz. Test point: C318 or C317 Clock voltage: 0.5~0.9Vpp Clock frequency: 26MHz Service Engineeing & Optimization Level 3 , Rev.1.0...
  • Page 51 Wi-Fi cannot turn on and test (3) • Check the pin states of the module. Test point: U16 pin 5 Clock voltage: 2.6V SYS_RST_L Test point: TP140 Clock voltage: 2.6V CHIP_PWD_L Test point: TP558 Clock voltage: 2.6V Service Engineeing & Optimization Level 3 , Rev.1.0...