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

Checking Flow START YES NO Check Battery Voltage > 3.4V ? Charge of Change Battery and try again YES Push power-on key and check the level change of U400 ON_SW/ NO Check the contact of power-key or dome switch YES 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 NO Replace the U400 YES The logic level at PS_HOLD(R402) of U400 = High ? NO Re-download software & try again YES Does it work properly? Does it work properly? NO NO The power-on procedure is completed. The problem may be elsewhere. YES The Phone will power on. Replace the main board.

4.3.1.2 Charging Trouble Circuit Diagram Test Points MAIN PCB Q404 +V_PM

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

4.3.2 LCD 4.3.2.1 LCD Trouble Circuit Diagram MAIN PCB Test Points • 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 CON100 CON101

Check CON600,CON100 soldering 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

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

Test Points MAIN PCB • 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

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

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

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 NO Check the Soldering of C314, C315 NO Replace U305 Yes Yes Re-solder C314, C315 Check the audio signal at R524 ,R525 NO Check the Soldering of R524 ,R525 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

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

Checking Flow START Check the audio signal at R335, R336 NO Check the Soldering of R335, R336 NO Replace U305 Yes Yes Re-solder R335, R336 Check the audio signal at R106, R107 NO Check the Soldering of CON600 ,CON100 and Connection of Coaxial Cable 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

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

Headset detect problem Headset sending path problem 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 4 3 The headset will work properly Headset receiving path problem 2 Check the audio signal at R338, R339 No Download S/W Yes Check soldering of Pin2,3 of CON604 No Replace U304 Yes Change main board

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 Does it work? No Download SW Yes Does it work well? No Change CON604 Yes 4

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

SETTING : After initialize 5515C, Test Cellular Checking Flow SETTING : After initialize 5515C, Test Cellular START Check the voltage level at R213 is 1.0~2.0V No Check the soldering Of R213 No Re-solder R213 Yes Yes Check the signal level at each side of MIC. Replace MSM 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

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

Is the voltage of MOTOR_EN 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

4.3.6.2 Micro SD Detect Circuit Diagram Test Points MAIN PCB KEY PCB 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

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

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

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