華碩電腦 GTC ■ Service Manual ASUS M930 Level 3 4 Trouble shooting Guide Ver 1.
華碩電腦 GTC ■ Service Manual CONTENT 1. OVER VIEW............................................................................................... 5 1.1 SYSTEM BLOCK DIAGRAM ............................................................................ 5 1.2 POWER DOMAIN BLOCK .............................................................................. 6 1.3 PLACEMENT TOP VIEW ............................................................................... 7 1.4 PLACEMENT BOTTOM VIEW .........................
華碩電腦 GTC ■ Service Manual 5. PHONE OFF ................................................................................................. 25 5.1 MODEM POWER ......................................................................................... 25 5.2 MODEM TO SYSTEM INTERFACE ................................................................. 26 6. POWER CONSUMPTION ......................................................................... 28 6.1 POWER OFF MODE ............................................
華碩電腦 GTC ■ Service Manual APPENDIX A .................................................................................................... 55 APPENDIX B..................................................................................................... 55 APPENDIX C..................................................................................................... 56 1. Introduction............................................................................................ 56 2. Set Slot ID.............
華碩電腦 GTC ■ Service Manual Forward The purpose of the troubleshooting guide just implement for the failure on the MMI Testing. We will show several cases to discuss the repair reference procedure. 1. Over view 1.1 System block diagram i. Figure 1.
華碩電腦 GTC ■ Service Manual 1.2 Power Domain Block Figure 2.
華碩電腦 GTC ■ Service Manual 1.
華碩電腦 GTC ■ Service Manual 1.
華碩電腦 GTC ■ Service Manual 1.
華碩電腦 2. SYSTEM Can’t Boot GTC ■ Service Manual The main of the reason always focus on the component short and incorrect Power-on Sequence. In personal opinion, the power consumption of M930 can be check before the Power on Sequence. Please check the Power consumption of the M930 via power supply in R&D comment. It always judges SMT component defective issue: short, open. In general, power range will below 1mA in the deep sleep mode (Not touch the Power key of the device).
華碩電腦 GTC ■ Service Manual Figure 3. Power On Sequence 1.2 Others 1.If all of the signal have checked and still not improve the status. Please check the below signal. C110.Pin1 32.768KHz R151.Pin1&2 26MHz 2. Please check the insulation tape is well between VGA Camera and FPC side. Please avoid the short issue. 3. If still can’t not improve the status, you should check the CPU and Memory status by X-ray machine.
華碩電腦 GTC ■ Service Manual 4. Figure 4. PMU-01 Figure 5.
華碩電腦 3. MMI Test item GTC ■ Service Manual 4.1 Micro SD Test The MMI test tool will be auto-executed by itself after we insert the MMI Micro SD card. If the phone can’t get the data on the storage device, we should check the pathway on below process. A. V_MMC 3.0V, CON27 Pin4 B. SD_DET# 0V, R54 Pin1. C. If item A fail, try to check open or short issue on the PMU. If item B fail, try to check the CON27 Pin13 & Pin14.In the general; it will short when we put in the card.
華碩電腦 GTC ■ Service Manual 4.3 Display Test The test item will focus LCM interface and backlight. If result is fail please check below item. A. VIO_LCD 1.8V, R143 both side. B. LCD_VSYNC LCD_HSYNC LCD_PCLK video clock, C238Pin1、C239Pin1、R111 both side on soldering issue. C. If the main screen backlight wasn’t executed, we can check below items on the LCD_PCB auxiliary board. (LED_V+) 12.1V MAIN_BL_EN 1.8V If something wrong with the result which we found, please check U1 peripheral components and circuit.
華碩電腦 GTC ■ Service Manual 4.4 Vibrator Test If the vibrator can not working, please refer to below items try to eliminate the error. U17 Pin1 3.0V PMU ( U31 ) open / short Figure 8. Vibrator Circuit 4.5 LED Test We can check the RGB LED function and keypad LED via this test item. The indication LED will show: Red-> Green->Blue->kpd White LED->Red…….etc. 2.5.1 RGB Led fail 1. 2. 3. 4. Please check R1, R2, R3 on soldering status. Check the Pin9 and Pin 10 on the U5.
華碩電腦 GTC ■ Service Manual Figure 9. Indication LED Circuit -01 Figure 10. Indication LED Circuit -02 4.6 2M Camera & VGA Camera Test We also test the item after assembly process. The main reason of the defective will focus on camera. Ex. Camera FPC fail 、 lens of the camera dirty 、can’t focus. If the pre-view image also shacking on the screen. Please check the defective or damage on the Coaxial Cable and follow procedure. i. VCAM_2V8 2.8V, C69 Pin1.If not please check the PMU.
華碩電腦 ii. iii. iv. v. GTC ■ Service Manual V_IO 1.8V, CON2 Pin6 2M camera and VGA common signal bus KEY_I2C_SCL、KEY_I2C_SDA、CAM_D0~D7 2M Camera ON CAM_2M_MCLK and CAM_XCLK Clock 2M_CLK_SHDN Low VGA_CLK_SHDN High VGA Camera ON CAM_VGA_MCLK and CAM_XCLK Clock 2M_CLK_SHDN High VGA_CLK_SHDN Low Figure 11. Camera control signal 4.7 SDRAM & Flash Test Due to POP procedure, there will not test point be explored. R72 1.8V If you can get 1.8V then check the open/short of the memory by X-ray machine.
華碩電腦 GTC ■ Service Manual 4.8 Audio Test Test 4.8.1 Headset fail Visual inspection earphone connector depends on soldering issue. a. If headset signal can’t be detected by phone. Please check the ， JACK_DET_1 and JACK_DET_2 1.8V. Please check the below components:R36、R93、C56、C240. b. Audio no effect on R/L pathway Please check the related circuit on U12, , ex:C40、C41、R37、 R38 both side to avoid soldering issue. Check the R30 Pin2 是 High ( 1.8V ) c.
華碩電腦 GTC ■ Service Manual Figure 13. Headset Circuit - 02 4.8.2 Speaker Most defective always related to the Speaker itself during the assembly period. Please check the below item. Speaker NO Sound R31、R32 Audio signal (oscillate scope) C46、C49 Audio signal (oscillate scope) If the C46、C49 can be check signal but SPK_P、SPK_N no be measured, please replace the U13 ( Class-D Amp). Figure 14.
華碩電腦 GTC ■ Service Manual 4.8.3 On-Board Microphone can’t record If recording quality is poor U15 NG. If recording function is fail, please check R39、R44、C55、C60. Figure 15. Microphone circuit 4.8.4 Receiver If Receiver no voice, please check the C1、C2 on the LCD_FPC. If still can’t find any signal , please check Soldering issue( open / short) on the PMU. Please replace the Receiver in the final step.
華碩電腦 GTC ■ Service Manual 4.9 Keypad Test Keypad is constructed by board-level test and assembly test. 4.9.1 Board level test: Check SMT issue and detect the each rows and columns function on the keypad matrix via driver IC. The pathway from driver IC to CPU via I2C protocol should be OK. We can use specify key group to verify the result. The purpose of the assembly test: Keypad FPC and Touch Feeling operated by end user. All of the buttons need be pressed. 4.9.
華碩電腦 GTC ■ Service Manual 4.9.3 Internal Qwerty Keypad The signal control by U31. If you have any problem, try to check soldering issue(Open / Short) by X-ray. Figure 17. Qwerty Keypad controller circuit 4.10 BT Test In general should be get follow bellow status Check C25 Visual inspection R80、R86 Check U55 Pin1 Pin9/Pin10 Short Pin6/Pin7 Short 26MHz clock Low Figure 18.
華碩電腦 GTC ■ Service Manual Figure 19. BT UART switch circuit 4.11 WiFi Test In general should be get follow bellow status D. Check R74 1.8V E. Check U10 Pin3 1.8V (High), If the result is true please check the U10 on the soldering issue. F. Check U8 Pin3 1.8V (High) Pin5 3.3V G. Check the signal of the R29 will get the dynamic wave by oscillate scope. H. Check R75 3.3V R142 2.85V Figure 20.
華碩電腦 GTC ■ Service Manual Figure 21.
華碩電腦 5. Phone Off GTC ■ Service Manual In the Vega2, the modem switch is control by CPU via UART/SPI interface command. It won’t cut off the modem power in the physical layer, we also check the procedure step by step: 5.1 Modem Power 1. 2. 3. 4. VBAT_MODEM 3.6V ~ 4.2V VBAT_MODEM_1 3.6V ~ 4.2V VBAT_MOD_EN 1.8V(High) Check the schematic related of the U40, try to rework with the U40. Figure 22. Modem Power circuit 5. VDDD_1V5 1.5V VDDE_1V8 1.8V VDDC_2V75 2.75V 6. MOD_POW_ON 1.8V(?) 7. RTC_CLK 32.
華碩電腦 GTC ■ Service Manual Figure 23. Modem RTC circuit 5.2 Modem to System interface The main inter phase which connected from CPU and Modem is constructed by U58 and U59. Please check the soldering condition on the BGA package of the chips(U58、U59) by X-ray detection. Figure 24.
華碩電腦 GTC ■ Service Manual Figure 25.
華碩電腦 6. Power consumption GTC ■ Service Manual We will support two mode to check our device in the power consumption test. In the Power Off mode, the value should be approach 0 mA. Insert the SIM card and Micro SD before the power on .The Sleep mode active tool will be automatic executed by itself in the Micro SD card. It will take 3 second when the screen turn to blend, system convert to sleep mode. The value should be approach 2~3mA in the lowest level.
華碩電腦 7. RF Repair requirement GTC ■ Service Manual 7.1 Software requirements requirements： uirements： U250_U360_E_Tool Modem Firmware：Latest Version(include：APP and ACC GDFS File) 7.2 Hardware requirements： requirements： RF Connector and RF cable High Frequency Probe with DC Block (connect with a 0603 1µF capacitor) Power Supply Contact 7.3 Equipment： PC Test Fixture Oscilloscope Communication tester：Agilent 8960, CMU200 or Anritsu 8820 Digital Multi Meter Power Supply Spectrum Analyzer (up to 3.
華碩電腦 8. Block Diagram GTC ■ Service Manual 8.
華碩電腦 GTC ■ Service Manual 8.2 GSM/GPRS/EDGE(EGG) Block Diagram 1.8V Key Components TX- RX FEM (U801) 1. Quad-Band GSM/GPRS/EDGE 2. Polar EDGE modulation 3. Low input power range ~ 0 to 6 dBm Tx attenuator 1.U811：5dB 2.
華碩電腦 GTC ■ Service Manual RXSAW Filters 1. 850： ：BPF800 (BG) 2. 900： ：BPF801 (TA) 3. 1800： ：BPF803 (SW) 4.1900： ：BPF802 (LF) RFIF_TRANSCEIVER_RF3000 (U800) 1. Zero-IF receiver 2. Polar modulation transmitter 26MHz Quartz Crystal (OSC800) 1.
華碩電腦 GTC ■ Service Manual 8.3 WCDMA Block Diagram Key Components Duplexer (U900) 1. TX to ANT Insertion Loss (1920...1980MHz) 1.2dB 2. ANT to RX: Insertion Loss (2110...2170MHz) 1.9dB 3. TX to RX: 57dB WCDMA Transceiver RF3100 (U906) 1. Single band application (UMTS band1) 2. 3GPP release 5, power class 3 3. Zero Intermediate Frequency WCDMA PA (U903) 1. VCC：2.75V 2. VDD：1.8V Coupler (U905) Coupling：19.30 ± 1.
華碩電腦 GTC ■ Service Manual 9. GSM & WCDMA RF Tx/Rx Path 9.
華碩電腦 GTC ■ Service Manual 9.
華碩電腦 GTC ■ Service Manual 9.
華碩電腦 GTC ■ Service Manual 10. Test & Repair Flow Chart 10.1 10.1 Conductive & Antenna Test Procedure Conductive & Antenna Test Procedure (Wireless) The phone is ON, but (Conductive) Change New Antenna Insert test SIM YES Registration OK Tx/Rx signal is normal 1. Confirm whether the spring keeps in touch with FPC well. 2. Confirm whether the matching circuit (C823, L811 and C822) is correct.
華碩電腦 GTC ■ Service Manual 10.2 GSM/GPRS/EDGE GSM/GPRS/EDGE Test & Repair Procedure How RF signal is transmitted and received between components on M930 PCB will be explained in this section. It is important to realize RF transmission path (Tx) and receiving path (Rx) before starting out to repair NG PCB, because engineers need to choose proper test points which assist us to catch the signal quickly Before beginning to repair, because we have no way of knowing questions.
華碩電腦 GTC ■ Service Manual 2. Placement on the PCB 3.
華碩電腦 GTC ■ Service Manual 4. Truth table of the circuit diagram (‘1’ is 1.8V & ‘0’ is near 0.2V) Transmission Receiver & Monitor Vapc only exists during that time transmitting (the value can’t over 1.5V). 5. Finally, according to its state form, which kind of wrong we can judge first. 6. 26MHz Crystal Suppose if there is no signal to appear, first, confirm whether crystal is on normal operation.
華碩電腦 GTC ■ Service Manual 10.3 EGG TX Path In M930 because PA has already included in SKY77513, there is no component in TX path. Only a low-pass filter exists in high band path. This filter consists of three components ： C819, C820, and L808. In addition, there is an attenuator on each path. Because it is difficult to obtain high-frequency probe, so I use the probe made by myself (Fig2) to detect power.
華碩電腦 GTC ■ Service Manual 10.3.1 Probe 0603 1µF/16V A 0603 1µF/16V Capacitor Fig2 10.3.
華碩電腦 GTC ■ Service Manual 10.3.3 Measurement Result EGSM900 Ch62 DCS1800 Ch700 Pay attention to this value only for confirming whether the component is normal, does not represent real power value. From reading the value, we can judge from it whether their wave and relative value are correct or not. In accordance with the specifications of the probe used, the value of measurement is also not the same. First, waveforms must be a normal bust, and low band should higher than high band about 1dB.
華碩電腦 GTC ■ Service Manual Enlarge the TX of Fig2(振幅：amplitude & 寬度：width) Range of Vapc is as follows： 1. Low band 850/EGSM ：PL5 Vapc=1.29(V) ~ PL19 Vapc=0.27( V ) 2. High band 1800/1900 ：PL0 Vapc=1.28(V) ~ PL 15 Vapc=0.
華碩電腦 GTC ■ Service Manual 10.4 EGG RX Because there are only four filters on RX path, so when the question happens, confirm the exactness of the packaging on filter at first. Later, according to RX of Fig1, confirmed that operation was normal, and observe the frequency of crystal is working or not. Rx Filter packaging is as follows： 1. BG：850 2. TA：900 3. LF：1900 4.
華碩電腦 GTC ■ Service Manual 10.5 GSM/GPRS/EDGE GSM/GPRS/EDGE Repair Procedure EGG Board Level Check relevant components on the path Repair Procedure Check 1. C826 is 3.8V 2. C802 is 2.75V and C805 is 1.8V 3. R828 has 26MHz No FEM has R、T、M waveforms YES Rx Check the four Rx filter Tx or Rx path fail Tx U811 (low band) should higher than U810 (high band) about 1dB YES Check range of Vapc： Low band 0.25(PL19) ~ 1.
華碩電腦 GTC ■ Service Manual 10.6 WCDMA Test & Repair Procedure WCDMA part in M930i, only support band1, its component is much more than EGG part. The main component is as follows, PA, duplexer, TX filter, RX filter, coupler, isolator, and RF3100 etc. WCDMA uses code to distinguish user, each user uses the same frequency, so especially need to pay attention to the control of power. And then, I will use the same analytical method of EGG. The same as EGG, we observe the state of FEM first.
華碩電腦 GTC ■ Service Manual 10.7 WCDMA TX Before repairing, please confirm one thing first. WCDMA RF reference clock (26MHz) is offered by RF3000, so please check R800 to be 26MHz first. 26MH Then, we will analysis the component characteristic on TX path; The signal will include its relative value. First of all, we probe into some characteristics of WCDMA transceiver first. Its power parts are divided into two parts: Analog (check R909 is 2.75V) and Digit (check R919 is 1.8V).
華碩電腦 GTC ■ Service Manual Using probe (Fig2) to check TX SAW Filter output (R912), can see a WCDMA signal. Pay attention to the value only for confirming whether the component is normal, does not represent real power value. Check PA output (C927(it’s a resistor R)) Conductive Power is 23dBm (CON900) PA Gain Condition： In high power mode is more than 27dB.
華碩電腦 GTC ■ Service Manual Check Duplexer output (R920) Pay attention to this value only for confirming whether the component is normal, does not represent real power value. In TX part, the main components are all passive, except PA and RF3100. So must especially discuss the operation principle of PA finally. This is divided into two parts：One is power supplied and the other is power detector. DC/DC converter is used to reduce WCDMA power consumption.
華碩電腦 GTC ■ Service Manual RF3100 has two RF _ DAC must be paid attention to：RF_DAC1 and RF_DAC2. DAC1 gives PA, and DAC2 gives DC/DC converter. In 23dBm, both of DAC1 (R910) and DAC2 (R905) are all 1.27 V；In 11dBm, DAC1 is 670mV and DAC2 is 570mV. Power detector is used to feedback power to DB3150, to transmitter correct wanted power.
華碩電腦 GTC ■ Service Manual Check WPOW_SENSE (U910 input) = PA output power - 20dBm ： Coupling is 20dB. Check power detector output (R904) = WPOW_SENSE – 15dBm ： Attenuator is 15dB.
華碩電腦 GTC ■ Service Manual 10.8 WCDMA RX Finally, we will analysis the RX characteristic. In WCDMA RX part, both of I and Q channel are HPSK signal (R924, R926, R930, and R931). On RX path, only one RX filter is external. It has a LNA (16dB) within RF3100 that amplifies the RX signal. Because the strength of RX signal is too small, so spectrum must have some extra setup. In order to observe the signal easily, must strengthen BCH to - 30dBm.
華碩電腦 GTC ■ Service Manual 10.9 WCDMA Test & Repair Procedure Check relevant components on WCDMA Board Level Repair Procedure FEM has waveforms R920 has power Check 1. C905 and L901 are 3.15V 2. R909, R900 are 2.75V and R919 is 1.8V 3. R800 is 26MHz No YES Tx or Rx path fail Rx Check L900 and RX filter Tx Change U906 RF3100 Check R912 power YES YES Check U905, U904, and U900 by relationship.
華碩電腦 Appendix GTC ■ Service Manual Appendix A Appendix B Band WCDMA ARFCN 9612 9750 9888 Conductive Power(dBm) 23.5 23.5 23.
華碩電腦 GTC ■ Service Manual Appendix C 1. Introduction This document describes the operating method by using E-Tool for EMP U360. 2. Set Slot ID Step 1 The E-Tool V1.0 dialog box will show when you execute P_E_tool.exe. Step 2 Choose Function->Slot ID, and click it to Set Slot ID automatically.
華碩電腦 GTC ■ Service Manual Step 3 It will show the following dialog , click “確定” to continue. Step 4 It will show the following dialog, turn on inactive DUT, to click “Abort” to continue. Step 5 If it shows the following dialog , click“確定” and please repeat Step2 through to Step4 .
華碩電腦 GTC ■ Service Manual Step 6 If the following dialog appeared, it represents Set Slot ID successfully. 3. Switch to TP Mode Step 1 The E-Tool V1.0 dialog box will show when you execute P_E_tool.exe.
華碩電腦 GTC ■ Service Manual Step 2 Choose Function->TP Mode, and click it to make the DUT switch into TP mode. Step 3 It will show the following dialog, turn on inactive DUT, to click “Abort” to continue. Step 4 If it shows the following dialog , click“確定” and please repeat Step2 through to Step3.
華碩電腦 GTC ■ Service Manual Step 4 If the following dialog appeared, it represents DUT switched into TP mode successfully.
華碩電腦 GTC ■ Service Manual 4. Operating Method GSM PART Step 1 The E-Tool V1.0 dialog box will show when you execute P_E_tool.exe. Step 2 Choose Function->U360->GSM, and click GSM to show GSM_U360_form dialog box.
華碩電腦 GTC ■ Service Manual Choice comport number to communicate with M930 (seen by computer).
華碩電腦 GTC ■ Service Manual Set GSM Switched RX Reset the GSM Radio 63 ASUS Proprietary
華碩電腦 GTC ■ Service Manual WCDMA PART Step 1 The E-Tool V1.0 dialog box will show when you execute P_E_tool.exe. Step 2 Choose Finction->U360->WCDMA, and click WCDMA to show WCDMA_U360_form dialog box.
華碩電腦 GTC ■ Service Manual Step 3 Choice comport umber to communicate with M930.
華碩電腦 GTC ■ Service Manual POWER Sense ADC Read Result is showed as below 66 ASUS Proprietary
華碩電腦 GTC ■ Service Manual Step 5 Reset WCDMA Radio 67 ASUS Proprietary
