Asus P526 Service Manual Download Page 35

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Service Manual

Above showing the backlight control IC, R67 shall be VBAT (4.0V).

R68 (LCM_LED_P) is around 11V ~ 14V.

Pin#2 of R17 (Backlight_DAC) shall be around 1V.

R69 (LCM_LED_M) is around 0.1 ~ 0.3V.

Pin#5 of Q10 (GP136_LOWLIGHT#) shall be low (0V), if backlight of LCM is in the “low
light mode”.

Summary of Contents for P526

Page 1: ...GTC Service Manual P526 Repair Lv3 4 SOP Version 1 1 2008 1 10 ...

Page 2: ...5 TROUBLE SHOOTING 14 5 1 SYSTEM CAN T POWER ON 14 5 2 TOUCH PANEL 19 5 3 1 Headset 21 5 3 3 Handset 23 5 4 BATTERY CHARGING 24 5 5 BUTTON KEYPAD TEST 26 5 7 CAMERA 29 5 8 LCD 31 5 9 LED 35 5 10 VIBRATOR 36 5 11 MICRO SD CARD 37 5 12 TMC 38 6 RF PURPOSE 40 7 EQUIPMENTS 40 7 1 SOFTWARE REQUIREMENT 40 7 2 HARDWARE REQUIREMENT 40 8 TEST POINTS 41 9 COMPONENTS DISPLACEMENT 44 10 THE SETUPS FOR THE MOB...

Page 3: ...5 COMPONENT DISPLACEMENT 89 16 TEST POINTS DISPLACEMENT PLOT 91 17 GPS HARDWARE EXAMINATION PROCEDURE 93 18 MEASUREMENT RESULTS OFALL TEST POINTS 97 19 BT REPAIR PURPOSE 99 20 EQUIPMENTS OF BT REPAIR 99 20 1 SOFTWARE REQUIREMENT 99 20 2 HARDWARE REQUIREMENT 99 21 TEST POINTS 99 21 1MAIN TEST POIN 99 21 2 COMPONENTS PLACEMENT 100 22 BT DEBUG 101 APPENDIX A 105 ...

Page 4: ...TC Service Manual 1 Equipment need A Power supply B Oscilloscope C Headset of P526 D TMC cable of P526 E AC charger of P526 F Battery of P526 G Mini USB cable H Micro SD card I PC 2 Outline and side keys ...

Page 5: ...GTC Service Manual ...

Page 6: ...GTC Service Manual 3 Introduction 3 1 Block diagram ...

Page 7: ...GTC Service Manual 3 2 Main components and placement Top Side Bottom Side ...

Page 8: ...following hardware tests could be done more convenient through MMI testing program and others will be tested through CrossBow 4 1 Audio test including headset handset and speaker Select audio application software Insert headset and click OK ...

Page 9: ...eft and right side of headset Then click X to next test for microphone of headset Please click circle button and speak some words The words you spoke will be played back to headset Then click X to next test for speaker Before entering next test for speaker please unplug the headset and click OK ...

Page 10: ...played to speaker Then click X to next test for microphone 4 4 Microphone test The action is same with the testing of microphone in headset except the words will be played back to speaker 4 5 Receiver test The action is same with speaker test except the audio is played to receiver ...

Page 11: ...GTC Service Manual 4 6 Button keypad test Select Button application software Please follow up the indication to press correct key and next indication will show up if the last correct key is pressed ...

Page 12: ... interface Select BTTestMode application software It is auto run and finally the string Run Script successfully is shown up meaning the UART interface between OMAP850 and blue tooth chip is OK 4 8 LED test Just select LED application software It is auto test ...

Page 13: ...GTC Service Manual 4 9 Vibrator test Just select LED application software It is auto test 4 10 TMC test TMC cable Just select A63xTMC application software It is auto test ...

Page 14: ...GTC Service Manual In version pop up windows just click OK TMC function is checked OK if the string GPRMC xxxxxx is shown on the screen ...

Page 15: ...c 5 1 System can t power on Needed Equipments A Power supply set to 4V 2A B Oscilloscope Note Normally the current during system powered on will not over 300mA and will be in the range of 50mA 200mA Please check following parts and signals Battery cover detection System will be shut down by software if battery cover detection is no function ...

Page 16: ...in 1 of R250 shall be low 0V Power on key system will not be powered up if power on key is no function Please press SW6 power on key and measure following signals a R92 and R109 shall be low 0V b Pin 1 of R128 shall be high 1 8V 32K clock System will not be powered up if 32K clock is no function ...

Page 17: ...GTC Service Manual Pin 1 of R26 XTAL_OUT shall have 32K clock after power supply is turned on Outputs of DC DC and LDOs ...

Page 18: ...C134 R30 shall be 1 5V VCORE_1V6 R27 pin 1 of C59 shall be 1 6V VMEM_1V8 R29 R55 R191 shall be 1V8 VCAM_2V85 R5 pin 1 of C163 shall 2 85V VBAT R137 R54 pin1 of C161 shall be 4V Signals related with power on sequence Following wave is shown the timing after power supply is turned on ...

Page 19: ...iming after power on key is pressed REGEN in channel 2 R59 shall be high 4V ON_nOFF in channel 3 R131 shall be high 1 5V MPU_RST in channel 4 R46 shall be high 2 8V Timing after power on key is pressed 1 XOEN in channel 2 R304 shall is high 1 5V RF_CLK in channel 3 C9 shall have 26M clock ...

Page 20: ...pressed 2 If above everything is OK and the current of power supply is stable stop in the range of 20mA to 70mA then it could be memory flash SDRAM U4 or OMAP850 U1 problem 5 2 Touch panel Needed Equipments A Power supply set to 4V 2A B Oscilloscope ...

Page 21: ...ll be high 2 8V d The signals TSC_XP T50 TSC_XM T51 TSC_YP T52 TSC_YM T53 shall have voltage change when different location of touch panel is pressed and the pin 2 of R90 GP134_TSC_IRQ shall have interruption signal low pulse then pin 4 of RN1 I2C_SCL and Pin 2 of RN1 I2C_SDA shall have read access timing output ...

Page 22: ...ding headset handset and speaker Needed Equipments A Power supply set to 4V 2A B Oscilloscope C Headset of P526 5 3 1 Headset a When headset is inserted pin 1 of R79 GP82_JACK_DET shall be high 1 8V otherwise please check the green path ...

Page 23: ...nts in the green path c L7 shall be 2 8V d R39 GP16_JACK_AMP_SHDN shall be high 2 8V e In the right channel L24 and L13 shall have audio signals otherwise please check the related components in the green path c Please check the microphone bias of headset in R18 and R80 first L3 C88 HSMICN and L22 C91 HSMICP shall have voice signals if you speak to microphone of headset d Please unplugged headset ...

Page 24: ...C72 shall have audio signals b L8 shall have VBAT 4 0V input c Pin 2 of R72 GP42_SPK_AMP_SHDN shall be high 2 8V d L9 and L11 shall have PWM signal with 4 0V level VBAT_CELL 5 3 3 Handset Receiver a You can make a call for voice connection or run audio test from MMI testing program then L20 and L21 shall have voice audio signal ...

Page 25: ...r voice connection or run audio test from MMI testing program then L15 shall have microphone bias 2 1V b Please speak to microphone and L16 C77 shall have voice signal 5 4 Battery charging Needed Equipments A Battery of P526 B Oscilloscope C AC charger of P526 ...

Page 26: ... of C155 BAT_TS c Pin 2 of R149 shall be high 4 5V 5V d R140 GP36_PSEL shall be high 3 3V e During charging pin 2 of R139 GP35_CHARGING_ST1 shall be low 0V and pin 2 of R138 GP86_CHARGING_ST2 shall be high 1 8V f After charging is finished pin 2 of R139 GP35_CHARGING_ST1 shall be high 3 3V and pin 2 of R138 GP86_CHARGING_ST2 shall be low 0V g R23 and R61 HDQ shall have correct signals with high 2 ...

Page 27: ...GTC Service Manual 5 5 Button keypad test Needed Equipments A Power supply set to 4V 2A B Oscilloscope ...

Page 28: ...GTC Service Manual ...

Page 29: ...ugh scanning of output pins b For example if numeral key 1 is pressing KBR_0 shall be low shorted to KBC_1 Opposite you can check the related connection if numeral key 1 does not work c OK Camera capture and Navi keys are also connected to KBC_x and KBR_x d When lock key is in the disable position R93 shall be low 0V e When lock key is in the enable position R93 shall be high 2 8V ...

Page 30: ...to 4V 2A B Oscilloscope a Please use MMI testing program to check the communication between OMAP850 CPU and blue tooth chip 5 7 Camera Needed Equipments A Power supply set to 4V 2A B Oscilloscope a R106 IOVDD and L26 AVDD shall have 2 85V b R107 DVDD shall have 1 8V c R115 GP150_CAM_RST shall be high 2 8V ...

Page 31: ...t signals high 2 8V low 0V and R13 CAM_MCLK R112 CAM_HS R113 CAM_VS and R114 CAM_PCLK shall also have correct signals high 2 8V low 0V e The camera module is controlled through I2C interface T56 I2C_SCL above channel 1 and T57 I2C_SDA above channel 2 shall also have correct signals high 2 8V low 0V ...

Page 32: ...GTC Service Manual 5 8 LCD Needed Equipments A Power supply set to 4V 2A B Oscilloscope ...

Page 33: ...hall be high 2 8V c R208 LCM_VDC and R209 LCM_IOVDD shall be 2 8V d R95 LCM_RST shall be high 2 8V e Pin 27 LCM_SPI_SCL pin 29 LCM_SPI_SDIO and pin 30 LCM_SPI_CS of CON6 shall have correct 2 8V SPI signals f Data signals LCD_D0_B0 LCD_D15_R4 LCM_D0 LCM_D15 shall have correct signals high 2 8V low 0V ...

Page 34: ...GTC Service Manual g R98 LCM_PCLK R99 LCM_HSYNC R100 LCM_VSYNC and R101 LCM_DE shall have correct signals like shown above ...

Page 35: ...ight control IC R67 shall be VBAT 4 0V i R68 LCM_LED_P is around 11V 14V j Pin 2 of R17 Backlight_DAC shall be around 1V k R69 LCM_LED_M is around 0 1 0 3V l Pin 5 of Q10 GP136_LOWLIGHT shall be low 0V if backlight of LCM is in the low light mode ...

Page 36: ...EEN_RED shall be high 2 8V and pin 6 of U21 GP145_PWM_RED_GREEN shall be high 2 8V R267 NO_RED shall be high 2 8V Pin 6 of Q6 shall be low b The green LED shall be flashing if phone camp to base station of GSM system Pin 4 of U21 PWM_MLPG1_GREEN_RED shall have PWM signal and pin 6 of U21 GP145_PWM_RED_GREEN shall be low 0V R26 NC_GREEN shall have PWM signal c The blue LED shall flashing if BT blue...

Page 37: ...lloscope Note You can run Vibrator test of MMI test program for testing or use vibrating setting while having in coming call a Pin 2 of R77 shall have 4 0V VBAT_CELL b When the vibrator is vibrating pin 2 of R81 GP126_VIBRATOR_EN shall be high 1 8V and pin 6 of Q1 shall be low around 0V ...

Page 38: ... First please check the socket of micro SD card is broken or not b R197 GP8_MMC_PWR_EN shall be high 2 8V c R198 VSDMMC_3V3 shall have 3 3V d When micro SD card is inserted pin 9 of J5 GP117_SD_DECT shall be low 0V e All signals SDMMC_DAT0 SDMMC_DAT3 SDMMC_CLK and SDMMC_CLK shall have correct signal high 3 3V low 0V ...

Page 39: ...st program for testing or test it through real TMC radio a Pin 1 of C173 shall have 3 3V b T59 GP137_TMC_EN shall be high 2 8V c Pin 2 of R203 shall be low 0V d Output of U28 will not enable since pin A1 1OE and pin B3 2OE is high connected to GP137_TMC_EN e Output of U27 is enable since its OE is connected to TMC_EN being inverter of ...

Page 40: ...t TMC cable is inserted 5 13 USB connection active sync Needed Equipments A Battery of P526 B Oscilloscope C Mini USB cable D PC a USB connection for active sync uses same connector with TMC cable Both signals R245 GP139_DOCK_PIN 4 and T59 GP137_TMC_EN determine which device will be selected The combination is listed below In USB mode R245 is low 0V and T59 is low 0V In TMC mode R245 is high 2 8V ...

Page 41: ... then repair the hardware trouble issues soon 7 Equipments require for identifying and repairing the GSM Edge hardware trouble issues of P526 7 1 Software requirement Phone Tool Modem Firmware Latest Version P526 repair tool 7 2 Hardware requirement Test Fixture Oscilloscope and Agilent Spectrum Analyzer Agilent 8960 or Anritsu 8820 ...

Page 42: ...GTC Service Manual 8 Test points Front End RF Switch part Including GSM antenna regions and Tx Rx traces ...

Page 43: ...GTC Service Manual PA GSM and Edge Power Amplifier part ...

Page 44: ...GTC Service Manual Transceiver part E syren signal from base band ...

Page 45: ...GTC Service Manual 9 Components displacement RF Part GSM antenna Pad GPS antenna Pad Front End Transceiver PA GPS area ...

Page 46: ...GTC Service Manual Front End RF switch GSM antenna Pad ...

Page 47: ...GTC Service Manual PA Component displacement plot 1 ...

Page 48: ...GTC Service Manual Transceiver 及 E syren part Component displacement plot 2 Component displacement plot 3 ...

Page 49: ...e To identify whether the GSM antaean trace is conducted or not the conductivity between R385 and C340 Component displacement plot 1 should be measured with the light meter If the conductivity between R385 and C340 is poor it means the MS156 RF connector is broken Please replace this one with a new MS156 After the replacement please check the conductivity of the GSM antenna trace again MS156 ...

Page 50: ...d the other is for DCS PCS bands Therefore to check if these two traces work correctly only the EGSM band and PCS band functions should be examined by the following steps As for the setup for the EGSM band is Channel 975 DAC 760 The setup for the PCS band is Channel 512 DAC 760 The setups of 8960 and 8820 are listed as the following pictures showing Band select The red light would be lightened if ...

Page 51: ...GTC Service Manual 8960 Select the item ...

Page 52: ...GTC Service Manual EGSM band select If the PCS band measurement choose the PCS band ...

Page 53: ...GTC Service Manual TCH band channel and PCL selecting If PCS band measurement choose Channel 512 and PCL0 ...

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Page 55: ...GTC Service Manual ...

Page 56: ...GTC Service Manual 8820 If PCS band measurement choose GSM PCS1900 ...

Page 57: ...GTC Service Manual For PCS band measurement choose Channel 512 For PCS band measurement choose PCL0 ...

Page 58: ...GTC Service Manual 850 EGSM loss fill in the positive number DCS PCS loss fill in the positive number ...

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Page 61: ...r 8820 the semi rigid with DC blocker and the Spectrum analyzer should be used to do the following measurements The setup of the spectrum analyzer are shown as below Band select The red light would be lightened if the connection between the PC and ...

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Page 64: ... Purpose To make sure that the RF signal emitting from the front end module D1016 is correct The TXP value got by the measurement would be 8 12 dB smaller than the TXP value shown on the 8960 or 8820 faceplate If the Ref level requirement is not 50 dBm it would be remarked ...

Page 65: ...nd measurement result Test point C456 for 850 EGSM band C457 for DCS PCS see component displacement plot 1 Purpose To make sure that the RF signal which emits from the PA and PA output circuit is Tx measurement result 2 Tx measurement result 1 ...

Page 66: ...GTC Service Manual correct EGSM band test result PCS band test result Test points C450 for 850 EGSM bands C451 for DCS PCS bands as component displacement plot 2 ...

Page 67: ...ce Manual Purpose To make sure the RF signal emitting from the PA is correct EGSM band test result PCS band test result Test points C312 for 850 EGSM bands C313 for DCS PCS bands as component displacement plot 2 ...

Page 68: ...he test results of C313 and C451 By this comparison it could verify whether the PA works correctly or not In this test the reference level of the spectrum analyzer should be 20 dBm EGSM band test result PCS band test result Test point R308 as component displacement plot 2 ...

Page 69: ...sceiver is correct This Vramp signal is the control signal for PA to be functioned well In this test use the oscilloscope The amplitude of the measured signal would change with the different DAC values The amplitudes would distribute among 1 5 1 8 V EGSM and PCS bands test result ...

Page 70: ...e To make sure the control signal emitting from the E syren to the transceiver is correct In this test use the oscilloscope The amplitude of the measured signal would change with the different DAC values The amplitudes would distribute among 1 5 1 8 V EGSM and PCS test result ...

Page 71: ... are three traces for the GSM and Edge functions One is for 850 EGSM bands another is for DCS band and the other is for PCS band Therefore to check if the three traces work correctly the EGSM band DCS band and PCS band functions should be examined by the following steps As for the setup for the EGSM band is Channel 975 DCS band Channel 512 and PCS band Channel 512 The setups of 8960 and 8820 are l...

Page 72: ...GTC Service Manual 8960 Rx test setup ...

Page 73: ...GTC Service Manual 8820 Rx setup At DCS band test fill in 1805 267 MHz at PCS band test fill in 1805 267 MHz At DCS band choose GSM DCS1800 At PCS band choose GSM PCS1900 ...

Page 74: ...GTC Service Manual At DCS band fill in 512 CH DL 1805 267MHz At PCS band fill in 512 CH DL 1930 267MHz ...

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Page 76: ...GTC Service Manual ...

Page 77: ... point C339 C344 for 850 EGSM C350 for DCS C354 for PCS as component displacement plot 1 Purpose To verify the received RF signal is correct after the D1016 RF connector EGSM band test result C339 C344 Rx measurement result 1 ...

Page 78: ...GTC Service Manual DCS band test result C350 PCS band test result C354 Test point RN300A D as component displacement plot 3 Rx measurement result 2 Rx measurement result 3 Rx measurement result 4 ...

Page 79: ... is correct In this testing both the spectrum analyzer and the oscilloscope could be used As for the reference level setup of the spectrum analyzer it should be 50 dBm EGSM band test result by spectrum analyzer EGSM band test result by oscilloscope Rx measurement result 5 Rx measurement result 6 ...

Page 80: ...GTC Service Manual PCS band test result by spectrum analyzer PCS band test result by oscilloscope Rx measurement result 7 Rx measurement result 8 ...

Page 81: ...GTC Service Manual Test point C367 as component displacement plot 3 Purpose To make sure the 26 MHz signal is correct In this test use the oscilloscope Rx measurement result 9 ...

Page 82: ... of the repair tool Besides the dsp value should distribute among 60 70 In this test the cell power of 8960 should be 80 5dBm the output power of 8820 should be 80 5dBm c If the dsp value is lower than 60 re heat D1016 RF switch first and then do the Rx measurement again with the Pegasus repair tool d If the re heat does not work do the measurements of test points C340 C339 C344 C350 及 C54 as comp...

Page 83: ...oscope If the test result is not the same as Tx measurement result 9 do the following step e k Do the Tx trace measurement of R384 with the oscilloscope If the test result is not like Tx measurement result 10 change the E syren with a new one If the test result of step e is correct but the test result of step d is not correct change the RF Transceiver HD155154NP l After the replacement of the E sy...

Page 84: ... APC will go on then Besides the Edge RF function works with the same Tx trace as GSM function Therefore in the Edge Tx trace test the only tests should be done are the step d f of the 3 GSM APC fail c While 8820 is used to do the 2G ATE23 RF function calibration the calibration program would do the Edge APC calibration first When the Edge APC calibration is finished the GSM APC will go on then Be...

Page 85: ... issues of P526 and then repair the hardware trouble issues soon 13 Equipment requires for identifying and repairing the GPS hardware trouble issues of P526 13 1 Software SiRFDemoPPC GPS Firmware GSW3 2 4 or GSW Instant fix 13 2 Hardware GPS active antenna Oscilloscope GPS signal generator Digital Multimeter ...

Page 86: ...GTC Service Manual 14 Test points 14 1GPS Active Path ...

Page 87: ...GTC Service Manual 14 2 Passive Path ...

Page 88: ...GTC Service Manual 14 3 SiRF StarIII 4 Power part test points ...

Page 89: ...GTC Service Manual 14 4 GPS Power part Testing signal from baseband ...

Page 90: ...GTC Service Manual 15 Component displacement GPS Antenna Testing signal from baseband ...

Page 91: ...GTC Service Manual GPS Function Block ...

Page 92: ...GTC Service Manual 16 Test points displacement plot GPS Antenna Testing signal from baseband Test point displacement plot 1 Test point displacement plot 2 ...

Page 93: ...GTC Service Manual GPS Function Block Test point displacement plot 3 ...

Page 94: ...eck whether the GPS function works or not 1 Re download the GPS firmware as Appendix B and then check if the GPS function or works or not 3 Active Path Fault Finding Chart Put GSP active antenna into CON301 and then make the active antenna near the window or open sky To get the fine GPS signal Make sureU315 Pin6 Low 0 2V Pin4 High 2 5V OK The C N0 value got by the SiRFDemo 35 NO NO Replace U315 wi...

Page 95: ... NO Replace the GPS antenna with a new one Check if C393 Pin2 and C419 Pin 1 get connection directly NO YES Change CON302 with a new one YES Check if the voltage of C399 is 3 10 V NO Check if the voltage of C385 Pin1 is 2 85 5 V NO Replace U310 with a new one YES YES Check if the voltage of C785 Pin1 is 2 85 5 V YES Replace U314 or do SIRF StarIII Fault Finding Chart ...

Page 96: ...voltage of R374 1 6V Do SiRF StarIII Fault Finding Chart or change U318 Replace U320 with a new one NO Check if the voltage of C414 1 5V NO V_bat is not on Check if the voltage of C415 is 1 5 5 V NO YES YES Replace U319 with a new one Do SiRF StarIII Fault Finding Chart YES 5 Power Part Fault Finding Chart ...

Page 97: ...Checnk C382 2 85V 5 C383 1 5V 5 C389 2 85V 5 OK Do Power Part Fault Finding Chart Measure C401 Pin1 OK Replace X301 with a new one Measure C406 Pin2 OK Replace X300 C810 C818 with new ones Measure T305 T306 OK Replace U312 with a new one Re Download GPS Firmware YES YES YES YES YES NO NO NO NO ...

Page 98: ...GTC Service Manual 18 Measurement results of all test points Test point T305 Test point T306 ...

Page 99: ...GTC Service Manual Test point C401 Test point C406 ...

Page 100: ...ouble issues of P526 and then repair the hardware trouble issues soon 20 Equipments of BT repair 20 1 Software requirement Modem Firmware Latest Version P526 BT repair tool 20 2 Hardware requirement Power supply Agilent Spectrum Analyzer 21 Test points 21 1Main test point U5 BT antenna pad Schematic about BT ...

Page 101: ...GTC Service Manual 21 2 Components placement Figure of P526 board ...

Page 102: ...out BT debug 1 1 Use the software to set the device under BT Test mode 1 2 Choose the designed channel 1 3 Touch the BT Antenna pad U5 with a RF probe 1 4 Measure the signal by a spectrum 1 5 Compare the signal level to a golden sample 2 Steps of entering BT Test mode 1 Enter the BT_Pegasus_test mode Step 1 ...

Page 103: ...GTC Service Manual 2 Choose the designed channel and then click Yes 是是是是 Step 2 3 Click Run Step 3 ...

Page 104: ...GTC Service Manual 4 Now the device is under BT test mode Step 4 3 Measured Graph ...

Page 105: ...GTC Service Manual 4 RF Board level examination procedure Flow Chart ...

Page 106: ...GTC Service Manual Appendix A Put SIRFDemoPPC at Micro SD Card 1 choose SiRFDemoPPC 2 choose OK ...

Page 107: ...GTC Service Manual 1 choose OK 1 choose Connect 1 choose Done 4800 or 57600 ...

Page 108: ...GTC Service Manual SiRFDemoPPC plantface 1 choose Signal GPS signal receiving ...

Page 109: ...GTC Service Manual The green signal means the signal has been demodulated When all tests are finished 1 choose setup 1 choose Exit ...

Page 110: ...GTC Service Manual ...

Page 111: ...GTC Service Manual Appendix B GPS firmware download 1 choose Pegasus_DGPS exe 1 choose Browse ...

Page 112: ...GTC Service Manual 1 choose Instant Fix GSW3 2 4Pat2_3 1 00 12 SDK001P1 00 20061227 NMEA57600EE s 1 choose Start The re download begins ...

Page 113: ...GTC Service Manual The re download is finished Mobile re boot A ...

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