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  1. R

    [SOLVED] 820-3435 No video but backlight

    without ssd and alt button press, always nothing on the screen, i make PRAM same issue. I wait 2 minute too same.
  2. R

    [SOLVED]820-2523 no boot

    Hi, this motherboard is clean, no liquid, the customer say after change his battery the macbook won't start. I check PPBUS_G3H=12,5 PPBUS_CPU_IMVP_ISNS=12,5V PPDCIN_G3H=16,8V PP3V42_G3H=0 When i short pin 5 J5713 the mac don't start SMC_PM_G2_EN=0V SMC_ONOF_L=3V3 nothing burn on the board. where...
  3. R

    [SOLVED] 820-3435 No video but backlight

    Hi, i have this macbook air with problem on the display (external & internal) black screen no image but i see the backlight. I have chime on start, fan turn, no liquid spill on the board very clean. I check PP3_V3S0SW_LCD_UF=3,35V , PPHV_S0SW_LCDBKLT=22V. i check resistor near lcd connector...
  4. R

    820-00045 no boot, no activity

    The CPU is warm (between 40°c 104°F and 50°c 122°F ).
  5. R

    820-2838 Green led no boot

    PP5V_S3_REG=0 indeed. when i short power pad (R5015), the fan do nothing and the power rail S3 and S0, always to 0v.
  6. R

    820-00045 no boot, no activity

    No Title i check the service manual guide (i have a friend who work for apple service center). you can look the minimal configuration talk about a 5W power adapter. it's not very important, heat a 40°c (thermalgun), i think it's the CPU. normal? PP5V_S0SW_LCD, PP5V1_S4SW,PP1V05_S4SW, this...
  7. R

    [SOLVED]820-00840 liquid

    i solve the problem with ultra sonic clean. now work good. thanks
  8. R

    820-2838 Green led no boot

    Hi this board liquid near U7000 & U7201, i change the caps damage. I have green led G3 rails are good, S5 rail too, but S3 rails are 0V except PP5V_S3_REG, and S0 rail at 0V SMC_PM_G2_EN=3,433V PM_SLP_S4_L=0V PM_SLP_S3_L=0V Y2810 pin1 =1,569 . pin2=1,750V I try to short the power pad but...
  9. R

    820-00045 no boot, no activity

    I don't undetand duke sorry i already check the PPxxx with 0V is not short. I check each signal where voltage is generate but i find why the signal is 0V. When you say S4 rail, it's all signal with S4 in the name? or other thing? i try with motherboard only with connector usbc and power adapter...
  10. R

    [SOLVED]820-00840 liquid

    Board liquid spill PPBUS_G3H=13V normal? i can't find information on the schematic. thanks
  11. R

    820-00045 no boot, no activity

    I check all rails except PPVBUS_E85,PP5V1_S4SW_CC1,PP5V1_S4SW_CC2 i can't measure. all rails are good except PPVIN_G3H_P3V3G3H=20V PP5V_S0SW_LCD=0V PP5V1_S4SW=0v PP1V05_S4SW=0V i have only the power adapter without battery
  12. R

    820-00045 no boot, no activity

    sorry the light is very low, i see it when i'm in the dark. i check all rails and i post my result
  13. R

    820-00045 no boot, no activity

    Pp3v3r3v0_aon = 3,262v
  14. R

    820-00045 no boot, no activity

    Hi, i try to solve my first macbook, when i plug the original power adapter 87W, i have nothing on the display. I dissassemble the mac, the logic board is clean (no liquid). the customer say before this problem, the mac shutdown intermittent. i measure this Voltage: PPDCIN_G3H=20V...
  15. R

    820-2532 No boot

    I have an issue with this board. Q7102 & F7040 is burn, i change it now I have F7040 and remove Q7102 but i haven't this component. Q7102 is it necessary to boot? because when i short power pad, fan don't spin or another dead component, C7771 = 1.05V No liquid on board. thanks
  16. R

    820-3536 Video issue and SSD not detected

    no it's not caused by liquid, clean board. The customer apply 12V on a usb port, is it crash the CPU? can i change the CPU? thanks
  17. R

    820-3536 Video issue and SSD not detected

    Hi, i have 2 problems on this board, i have video issue (like the picture) and the SSD is not detect by the motherboard (i don't have another macbook pro to test the ssd). the customer say maybe the problem come after put a board supply by 12V. i seems it's strange, if that the board will be...
  18. R

    [SOLVED]Backlight 820-3208

    Ok i change LP8550 now the light come back, i test it all the night and i come back tomorow, thanks
  19. R

    [SOLVED]Backlight 820-3208

    I remove LP8550 U9701 but C13 is missing TP_BKL_FAULT i don't see on schematic if this net is necessary. Can you confirm if i put a new one, the missing pin is stopping the device from working?
  20. R

    820-2850 no backlight

    yes the image is dark but with flashlight i see. BCKLIGT_EN_DIV= 12,08V LCD_BCKLT_FUSED= 12,50V PPBUS_S0_LCDBKLT_PWR=0,3V
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