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Asus ZS551KL Troubleshooting Manual
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Asus ZS551KL Troubleshooting Manual

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ZS551KL
EE Troubleshooting Guide
Introduction & Training
2017/8/9

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Summary of Contents for Asus ZS551KL

  • Page 1 ZS551KL EE Troubleshooting Guide Introduction & Training 2017/8/9...
  • Page 2 ZS551KL Outline • Component and PCB Board Introduction • Power On Sequence • BL Troubleshooting Guide • ASSY Troubleshooting Guide...
  • Page 3 PCB Board Introduction (TOP) Indicator LED P-Sensor Receiver CAM ISP SIM2/SD/SIM1 MSM8998 LPDDR4x Receiver NFC IC PMI8998 OVP IC Switch Speaker...
  • Page 4 PCB Board Introduction (BOTTOM) Flash LED laser MIC3 RCAM & G+G CONN Laser sensor MIC3 FCAM PM8998 CONN Side key Ecompass CONN PM8005 BATT SMB138 CONN WCD933 driver CONN Vibrator CONN...
  • Page 5 SUB Board Introduction (TOP) Vibrator springs Hall sensor USB_TYPEC_CONN...
  • Page 6 SUB Board Introduction (BOTTOM) PU3302 CONN Audio jack CONN Fingerprint CONN Main MIC USB_TYPEC_CONN...
  • Page 7 ZS551KL Outline • Component and PCB Board Introduction • Power On Sequence • BL Troubleshooting Guide • ASSY Troubleshooting Guide...
  • Page 8 POWER ON SEQUENCE...
  • Page 9 ZS551KL Outline • Component and PCB Board Introduction • Power On Sequence • DL/BMMI Troubleshooting Guide • ASSY Troubleshooting Guide...
  • Page 10 1001 Provision check fail-DL PC can’t detect USB COMPORT. Check your device manager for COM Qualcomm QDLoader 9008. If not, please check: Check the power supply/battery (4.2V) Make sure all fixture pins contact well, also check the connection of the IOFPC and Sub board If heavy current occurs when booting up, probe VBAT (T9603 or T9602) and VPH_PWR (C2402.1 or C2402.1) and search for short circuits.
  • Page 11 1002 UFS provision fail -DL UFS provision fail Please open the device manager on the PC and retry offline. Monitor QDLoader 9008 remains or not when provision. If not, check your power supply/battery, and the power key status (T2503). If retry fail, try to burn QFIL lite image (ask BSP). If success, we can narrow down to DDR problems.
  • Page 12 1004 DL image fail -DL Flash Factory image fail often known as SMT problems. Monitor the current before/after flash image. If there is heavy current, check CPU/DDR (U0201) and UFS (U1101) to search for SMT problems. If no SMT problems found, demount the shielding on the backside of the CPU. Check the power on sequence to check power rails below: (1) C0711.1 (VREG_S4A_1P8) (2) U0737.1 (VREG_S2A_1P125)
  • Page 13 (2) Check both fixture pins’ contact (T9613 & T9606) (3) Open the device manager and test offline with a panel connected. If the panel blackouts when showing ASUS log, please check the connection between IOFPC & SUB board.
  • Page 14 No display-BMMI Display blackout after a flicker, or just no display while ADB device can be recognized after booting up. 1. Check CON1602 for any short circuits, shift, or solder skips. 2. Swap the testing panel and also check the connector on the panel FPC. 3.
  • Page 15 724 SIM test fail-BMMI Check R2212 for SMT issues, and probe the detect pin’s C2212.1 status shown below.(1.8V)； If detect pin is high when tray inserted (normal), 1. Probe SIM1 power VDD_SIM(1.8V) or SIM2 power VREG_L10A_1P8 when either SIM inserted. Check U5401、PU8401 for any defects if any power unusual.
  • Page 16 824 SDCARD test fail-BMMI 1. Probe the detect pin’s status (same as SIM fail)； 2. Probe SDC2_VDD_CON C2208.1. Monitor the voltage when SD card inserted. (2.95V for few secs and back to 0V) 3. If 2. fails, check the appearance of U2201 to find any cracks, SMT issues, and also check inside the tray shielding to find any bent or shifted pin.
  • Page 17 835/853 Ecompass test fail-BMMI U1802 E compass can’t initial, or I2C bus error. Please check: Check the appearance of U1802, C1809 for cracks, short circuits, wrong polarity. Change U1802 if any defect found. If no defect found, probe U1803 4 pins and compare the impedance with normal PCB.
  • Page 18 931、932、907、908、994 MIC Fail - BMMI There are three MICs on the device, including on the SUB board AU3401(Main Mic), and also main board AU2701(2nd Mic)、AU2704(3rd Mic). These error code means Board_Mic_FREQ Fail Board_Mic_Volt Fail 1. Check the appearance of all MIC for wrong polarity, shift, and solder overflow. Besides, also check surrounding components.
  • Page 19 950/986 TYPE C test fail-BMMI USB can’t connect through one specific side of the TYPE C connector. 950-Main board: Swap both Sub board and IOFPC to sort out the fault part. Probe both TYPE C CC pin’s (T1704 and T1705) impedance to GND (normally 2M Ohm).
  • Page 20 996 LID test fail-BMMI LID apk passed, but LID test fail. Use x-ray to confirm all components in the picture are mounted, or demount the shielding (the one with CPU & UFS) and check are there any lost components. Demount the shielding and check the appearance of PQ8004, PQ8005 and their surrounding components (wrong polarity, IC cracks, short circuits)
  • Page 21 2148 Fingerprint test fail-BMMI Fingerprint module no response usually are ASSY problems. Main board: Please swap the panel, sub board, and IOFPC on the testing fixture. Check CON1702 for any SMT issues. Sub board: Please swap the IOFPC and panel on the testing fixture. Check the contact between the FGP FPC and CON3303.
  • Page 22 2176 USB thermal fail-BMMI USB thermal alert circuit problem, please check: Main board : Swap both sub board, IOFPC, and reassemble the panel. Check PQ8002, PQ8006 using X-ray for SMT problems. Especially check PR8015, it should be mounted. Demount the shielding, power on, and probe the voltage of PR8015.1. The voltage should be when sub board connected.
  • Page 23 5015 Charger thermal fail-BMMI Usually PU8101(SMB1381) defects: Check PU8101 PRT8101 for any SMT issues (components shift, short circuits) Demount the shielding and probe the impedance between PRT8101.2 and GND (90~95K Ohm) Please swap PRT8101 then swap PU8101.
  • Page 24 5088 Audio Codec FAIL-BMMI Usually AU2601 Audio Codec problems: 1. Check AU2601 by X-ray for any short circuits, solder skip, or shifting of IC and it’s surrounding components.
  • Page 25 Camera fail - BMMI No matter which sensor fails, swap the modules and reassemble. If all three camera fail: Probably CPU and ISP issues (1) Check U1201 (ISP) and surrounding components R1239, PU9510, PU9507, PU9509, PU8202 for SMT problems using X-ray. Besides, check CPU U0201 for any short circuits.
  • Page 26 Camera fail - BMMI No matter which sensor fails, swap the modules and reassemble. If only sensor fails, there are two conditions : Black screen under camera APP, but APP didn’t shutdown. (sensor might be initiated, but not sending any frame.): (1) Possibly MIPI CSI problems, check U1201 (ISP) and R1223, R1224, R1225, R1226, R1227...
  • Page 27 857 Front Camera fail - BMMI I2C FrontCamera Fail 1. Check CON1401 for SMT and ASSY issues (shift, solder skip, short, cracks). 2. Swap the module. 3. Compare the impedance of CCI_I2C_SCL1, CCI_I2C_SDA1 with normal board. If any unusual net, demount the shielding of SoC and check R9804,R9805.
  • Page 28 857 Front Camera fail - BMMI FrontCam_Check Fail This fail means I2C bus is normal but no preview. 1. Check U1201 (RK) U0201 (SoC) by X-ray； 2. Demount the shielding U3002 and check the polarity and appearance (cracks, soldering) of U1201 (RK)；...
  • Page 29 856 Rear Camera1 fail - BMMI I2C RearCamera1 Fail 1. Check CON1301 for SMT and ASSY issues (shift, solder skip, short, cracks). 2. Swap the module. 3. Compare the impedance of CCI_I2C_SCL0, CCI_I2C_SDA0 with normal board. If any unusual net, demount the shielding of SoC and check R9802,R9803.
  • Page 30 856 Rear Camera1 fail - BMMI RearCam1_Check Fail This fail means I2C bus is normal but RearCam1 has no preview. 1. Check U1201 (RK) U0201 (SoC) by X-ray； 2. Demount the shielding U3002 and check the polarity and appearance (cracks, soldering) of U1201 (RK)；...
  • Page 31 856 Rear Camera2 fail - BMMI I2C RearCamera2 Fail 1. Check CON1301 for SMT and ASSY issues (shift, solder skip, short, cracks). 2. Swap the module. 3. Compare the impedance of CCI_I2C_SCL1, CCI_I2C_SDA1 with normal board. If any unusual net, demount the shielding of SoC and check R9804,R9805.
  • Page 32 856 Rear Camera2 fail - BMMI RearCam2_Check Fail This fail means I2C bus is normal but RearCam1 has no preview. 1. Check U1201 (RK) U0201 (SoC) by X-ray； 2. Demount the shielding U3002 and check the polarity and appearance (cracks, soldering) of U1201 (RK)；...
  • Page 33 ZS551KL Outline • Component and PCB Board Introduction • Power On Sequence • BL Troubleshooting Guide • ASSY Troubleshooting Guide...
  • Page 34 ASSY Troubleshooting Guide Boot up issues 15. Vibrator Reboot/Shutdown High current consumption Display issues Touch/Virtual key issues Fingerprint issues Camera issues G sensor test fail E-compass issues 10. USB issues 11. Charging issues 12. SD/SIM card detection 13. Flash LED 14.
  • Page 35 Boot up issues - ASSY Make sure the battery FPC contacts well with the connector CON9601. Also check if there are any SMT issues. Please check the battery voltage (> 3.7 V) by probing T9603 or T9602. Also remember probe C3304.1 if a USB cable is connected to check the 5V input. Check the KEY FPC LCM FPC...
  • Page 36 Reboot/Shutdown - ASSY Shutdown Battery is connected to the connector firmly, check if the battery FPC is interfered by the sponge. Swap your battery to check if it’s a fault battery. Please check: MB: Check CON9601 for any SMT problems, foreign matters. Battery: Check for any torn parts on the battery FPC, and check if the connector Reboot:...
  • Page 37 High current consumption - ASSY Suspend current & off current: Remove all connectors to check if there are any fault key parts or functions. If there are fault parts, please check if there are any damage on the FPC/connector/sub board/IOFPC, and also swap parts to double check. If there are no fault parts, check the appearance of the MB to find any SMT/ASSY issues (bumped off IC, bending springs).
  • Page 38 Display issues - ASSY Display failure: Make sure if LCM FPC contacts well with CON1602. Check CON1602 to make sure there are no defects (sunken pins, cracks, SMT issues) Swap panels to make sure the parts are functionally normal. Probe VREG_WLED (PC8906.1, 6.1V), DISP_P_OUT (PC8904.1, 4.6V), VDISP_M_OUT (PC8905.1, -2.5V) to make sure all voltages match.
  • Page 39 Touch/Virtual Key issues - ASSY Touch screen with no response: Check CON1602 to make sure there are no defects (sunken pins, cracks, SMT issues) Swap panels to make sure the parts are functionally normal. Virtual key with no response: Check CON1602 to make sure there are no defects (sunken pins, cracks, SMT issues).
  • Page 40 Fingerprint issues - ASSY Fingerprint module (FGP) is fixed to the touch panel. If FGP can’t detect / no response: Check the FPC if there are any ripped area. Make sure CON3303 and FGP FPC contact well. Check CON3303 and make sure there are no defects (sunken pins, cracks, SMT issues).
  • Page 41 Camera issues - ASSY There are two conditions of camera failure: Camera APK shutdown (Camera power, I2C interface) (1) Please check both camera FPCs and connector are inserted well. (2) Check CON1401, CON1301 to make sure there are no defects (sunken pins, cracks, SMT issues).
  • Page 42 G sensor test fail- ASSY Camera module PCB bending is the main cause of G sensor inaccuracy: Zeus G sensor is on the rear camera module, so please check if the rear CAM is working (for checking FPC contact). Remove the FPC and insert again. Check CON1301 to make sure there are no defects (sunken pins, cracks, SMT issues).
  • Page 43 E-compass issues - ASSY E-compass no response / cannot initial. Usually SMT/ASSY issues. Make sure U1802, C1809 is not bumped off Change the IC if there are any cracks on the package. Probe VREG_LVS2A_1P8 (C1809.1) to check the voltage 1.8V, also check if there are any short circuits.
  • Page 44 USB issues - ASSY No USB device on PC: Swap your USB cable, USB port to avoid external NG parts. Check the contact of the IOFPC (might result in no VBUS input) You may check the connectivity between MB/IOFPC/SUB by probing (1) R3301.1 &...
  • Page 45 Charging issues - ASSY No charging: Swap your cable, adaptor/USB port to avoid NG parts. Check the contact of the IOFPC (might result in no VBUS input). Check CON1702, CON3201 to make sure there are no defects (sunken pins, cracks, SMT issues). Probe C3304.1 for 5V input.
  • Page 46 SD/SIM card detection - ASSY SMT problem are the main cause of SD card detection. Probe SD_CARD_DET (R2212.2) to check if it pulls high (1.8V) when tray is inserted. Check U2201 for cracks, short circuits, SMT problems. Also check: SD card: CON2206, CON2202, SIM card: CON2204, CON2203, for any...
  • Page 47 Flash LED - ASSY Check cracks or defects of the appearance of the LED. Make sure there are no pin shift, short circuits. Probe the LED test point (T1301)by using the diode meter, make sure the LED can light up.
  • Page 48 P-sensor issues - ASSY 1. Check if there is a possibility to pass under stress test (5~10 times). 2. Observe the window to see any obstacles blocking the sensor (sensor rubber, dust, fingerprints). 3. Reassemble and calibrate again to make sure if it is functional. 4.

  • Page 49: Vibrator - Assy

    Vibrator - ASSY There are two conditions of vibrator problems: No vibration/ unusual vibration: Check whether both springs (U3305, U3304) contact well with the vibrator. Please assemble again to double check the RF cables don’t interfere with the SUB board. Swap the vibrator to avoid NG parts.