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4.3.1 Power

4.3 Logic Part Trouble. 4.3.1 Power. 4.3.1.1 Power-On Trouble. Circuit Diagram. MAIN PCB. +2.9V_ RX0. +2.8V_ TCXO. +2.6V_ MSMA. U400. +2.6V_ MSMP2. +1.4V_ MSMC. +1.8V_ MSMP1. START. Push power-on key and check the level change of U400 ON_SW/. Check the voltage

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4.3.1 Power

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  1. 4.3 Logic Part Trouble 4.3.1 Power 4.3.1.1 Power-On Trouble Circuit Diagram MAIN PCB +2.9V_ RX0 +2.8V_ TCXO +2.6V_ MSMA U400 +2.6V_ MSMP2 +1.4V_ MSMC +1.8V_ MSMP1

  2. START Push power-on key and check the level change of U400 ON_SW/ Check the voltage Level of the following port at U400 +1.375V_MSMC +2.6V_MSMP2 +1.8V_MSMP1 +2.6V_MSMA +2.8V_TCXO +2.9V_RX0 The logic level at PS_HOLD(R402) of U400 = High ? Does it work properly? Does it work properly? Checking Flow YES NO Check Battery Voltage > 3.4V ? Charge of Change Battery and try again YES NO Check the contact of power-key or dome switch YES NO Replace the U400 YES NO Re-download software & try again YES NO NO The power-on procedure is completed. The problem may be elsewhere. YES Replace the main board. The Phone will power on.

  3. 4.3.1.2 Charging Trouble Circuit Diagram Q404 Test Points MAIN PCB Q402 Q405 Q401 +V_PM

  4. START Voltage at +V_PM of Q405 = 4.2V? The logic level at BATT_FET/ of Q405 = Low? Is the battery charged Checking Flow SETTING : Connect the battery and the charging adaptor (TA) to the phone YES NO The charging adaptor (TA) is out of order. Change the charging adaptor. Voltage at +V_CHAR of Q401 = 4.8V? YES NO Voltage at Q404 = 4.8V? Replace Q401, Q402 YES NO Replace Q404 YES NO Replace Q405 YES NO The battery may have the problem Change the battery and try again. YES Charging will operate properly

  5. 4.3.2 LCD 4.3.2.1 LCD Trouble Circuit Diagram • LCD Control signals From MSM : D2[0:15], LCD_REST/, LCD_CS/, WE2/, A2[7] • Check point - The assembly status of the LCD Module - The Soldering of connector MAIN PCB Test Points CON600 +2.8V_LCD MAIN PCB SUBPCB U402 Coaxial Cable F103 F102 F101 F100 CON101 CON100

  6. Checking Flow START Yes Voltage at +2.8V_LCD of U402 = 2.8V? No Replace U402 Yes ; Check F100, F101, F102, F103 Check the Control signal D2[0:15], RESET/, LCD_CS/, WE2/,A2[7] No Replace Coaxial Cable Yes Check CON600,CON100 soldering No Re-solder CON600 ,CON100 Yes Check CON101 soldering No Re-solder CON101 Yes Change the LCD Module

  7. 4.3.3 Camera 4.3.3.1 Camera Trouble Circuit Diagram • Camera Control signals From MSM : CAM_DATA[0:7], CAM_RESET/, CAM_SDA, CAM_SCL, CAM_CLK, CAM_PCLK

  8. Test Points • Check point - The assembly status of the Camera Module - The Connection of connector MAIN PCB +2.6V_ CAMA +2.6V_ CAMIO U400 R528 F500 R529 F501 CON502 R536 C519 X500

  9. Checking Flow START Check the clock to Camera at R536(48MHz) No Replace X400 Yes Check the clock from Camera at C519 : CAM_PCLK No Replace the Camera module assay Yes Check the voltage Level of the following port at U400 +2.6V_CAMA +2.6V_CAMIO No Replace U400 Yes Check the Control signal CAM_DATA[0:7], CAM_RESET/, CAM_SDA, CAM_SCL ; Check F500, F501,R528,R529 Yes Check CON502 soldering No Re-solder CON502 Yes Camera will work properly

  10. 4.3.4 Audio 4.3.4.1 Speaker Trouble Circuit Diagram MAIN PCB Test Points CON502 R525 R524 U305 U302 C315 C314 L300

  11. Checking Flow SETTING : “Melody on” at sounds of test menu. START Voltage at L300 Is about 3.4~4.2V NO Replace L300 Yes Check the audio signal at C314, C315 Check the Soldering of C314, C315 NO NO Replace U305 Yes Yes Re-solder C314, C315 Check the audio signal at R524 ,R525 Check the Soldering of R524 ,R525 NO NO Replace U302 Yes Yes Re-solder R524 ,R525 Check the state Of contact of CON502 NO Reconnect Camera ASSAY Yes Check the state Of contact of speaker NO Replace Speaker Yes Speaker will work properly

  12. 4.3.4.2 Receiver Trouble Circuit Diagram Test Points MAIN PCB R335 CON600 MAIN PCB SUBPCB U305 R336 R106 R107 Coaxial Cable CON100

  13. Checking Flow START Check the audio signal at R335, R336 Check the Soldering of R335, R336 NO NO Replace U305 Yes Yes Re-solder R335, R336 Check the audio signal at R106, R107 Check the Soldering of CON600 ,CON100 and Connection of Coaxial Cable NO NO Replace CON600 ,CON100, Coaxial Cable Yes Yes Re-solder CON600 ,CON100 Check the state Of contact of receiver NO Replace Receiver Yes Receiver will work properly

  14. 4.3.4.4 Headset Trouble Circuit Diagram MAIN PCB Test Points CON604 R338 R331 U304 MAIN PCB U303 R339

  15. Checking Flow START Insert the headset to the handset. Yes Headset detect problem Does the audio Profile of the phone change to the headset mode? No 1 Yes Set the audio part of the test equipment to echo mode Set the audio part of the test equipment to continuous wave mode Can you hear your voice from the headset? Headset receiving Path problem No Change the headset and try again. Yes Can you hear the sound from the headset? No 2 No Can you hear your voice from the headset? Yes Yes Headset sending path problem 3 4 The headset will work properly Headset receiving path problem 2 Check the audio signal at R338, R339 Download S/W No Yes Check soldering of Pin2,3 of CON604 No Replace U304 Yes Change main board

  16. Headset detect problem 1 Headset detect problem Level of pin4 of CON604 Is 1.65~2.10V? Check soldering R331 No No Yes Yes Re-solder R331 Check soldering U304 No Re-solder U304 Yes Level of EAR_JACK_SENSE/ Is low? No Download SW Yes 4 Headset sending path problem Headset sending path problem 3 Level of pin4 of CON604 Is 1.65~2.10V? No Re-solder R331 Yes No Does it work? Download SW Yes Does it work well? No Change CON604 Yes 4

  17. 4.3.4.3 Mic Trouble Circuit Diagram Test Points R117 M100 KEY PCB R125

  18. Checking Flow SETTING : After initialize 5515C, Test Cellular START Check the voltage level at R213 is 1.0~2.0V Check the soldering Of R213 No No Re-solder R213 Yes Yes Replace MSM Check the signal level at each side of MIC. No Replace the microphone Yes Check the soldering at VR117, VR125 No Re-soldering R117, R125 Yes Check the soldering of MIC NETWORK No Re-solder MIC NETWORK Yes MIC will work properly

  19. 4.3.6 Vibrator, Mini SD Detect, and USB Interface 4.3.6.1 Vibrator Circuit Diagram Test Points KEY PCB Q100 R102 R103 R101 Q102

  20. Checking Flow SETTING : “Vibrator on” at Sounds of test menu START Is the voltage of MOTOR_EN about 2.6V ? No Change the main board Yes Check soldering of R101, R102, R103 No Re-solder R101, R102, R103 Yes Is Q100, Q102 Working? No Replace Q100, Q102 Yes Check the state at Contact of Vibrator No Re-contact vibrator Yes Replace Vibrator Yes The vibrator will Work properly

  21. 4.3.6.2 Micro SD Detect Circuit Diagram Test Points CON101 MAIN PCB KEY PCB PIN 1 U400 PIN 2 PIN 3 PIN 4 PIN 5 PIN 7 PIN 8 PIN 9 +3.0V_ SD

  22. Checking Flow SETTING : Insert the mini SD card into the phone START Level of SD_DETECT at PIN 9 of CON101 is ‘High’ ? No Check the soldering of CON101 Yes Level of +3.0V_SD at U400 is 3.0V ? No Replace U400 Yes Levels of SD_CMD(PIN3 of CON101) and SD_DATA[0]~DATA[3](CON101) are ‘High’ ? No Reconnect CON102 Yes Access a file in the micro SD ; play music or view a PIX/FLIX Frequency of SD_CLK(PIN5 of CON300) is about 9.6MHz ? No Replace the main board Yes THE MINI SD CARD WILL BE DETECTED

  23. 4.3.6.3 USB Interface Circuit Diagram Test Points MAIN PCB Q407 X200 R200 D402

  24. Check the soldering X200,R200 Check the soldering Q407 The Frequency at X200 is 48 MHz? Check the voltage of the following port at Q407 USB_POWER=5V? Check the voltage level at R551 Is it almost 3.3V? Checking Flow START YES NO Level of VBUS at D402 is 5.0V ? Check the connecting of the data cable YES NO NO Replace Q407 YES Re-soldering Q407 YES NO NO Replace X200,R200 YES Re-soldering X200,R200 YES NO NO Check the soldering R551,R552 Replace U400 YES YES Re-soldering R551,R552 THE USB INTERFACE WILL WORK PROPERLY

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