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  1. R

    820-00239 mac work but no USB power for HDD external

    my hub work on a good mac and the hub of my customer don't work too.
  2. R

    820-00239 mac work but no USB power for HDD external

    yes all four port work to charge the macbook pro. yes i have always 20V all usbc without battery but never the 5V for old usb.
  3. R

    820-00239 mac work but no USB power for HDD external

    no the mouse and pendrive not work, and i try a tester USB3 i haven't 5V. i try on a good know macbook pro, i can see the 5V on the tester.
  4. R

    820-00239 mac work but no USB power for HDD external

    Hi, i have this board with a problem with external Hard drive, no power for external hard drive. I have a tester for usbc port, the power supply charge the battery (20V 1-2A). but nothing for external hard drive. i don't understand why it work only in one way. The motherboard contact with liquid...
  5. R

    820-00239

    ok i understand. do you think the display is burn too? thanks
  6. R

    820-00239

    No it's not backlight rail burn, it's EDP_INT_AUX_N burn, i check all PM_SLP_Sx it's all at 3,3V my friend have the same mac, it work on external display. i don't understand why you say "No dedicated GPU, so external video missing too"
  7. R

    820-00239

    Hi, i have this board with liquid spill near U7100, i change C7100 and R7100 now the board seems start but no display ALL_SYS_PWRGD is OK. i haven't noise (dong) when i plug power cord but i have 20V and between 1and 2A. the display cable is burn, i change it. i'm afraid the display is dead...
  8. R

    820-00138 fan start, no chime, no display

    i check with this board for help but U1930 is unmount (i verify on a donor board, no component on U1930) I can't find R1930 :-(
  9. R

    820-00138 fan start, no chime, no display

    where is it? In the boardview of 820-00138, R1930 & U1930 is not present.
  10. R

    820-00138 fan start, no chime, no display

    CPU_PWRGD = 0V, PP1V05_S0_CPU_VCCST=1,05V, CPU_VCCST_PWRGD= 0V U1100 is dead? i don't understand if it's U1100 who make the CPU_PWRGD signal or U1930 for CPU_VCCST_PWRGD. can i jump R1800 to 1,05V?
  11. R

    820-3299

    i use an tektronix tbs 1102B and i don't see anything on PM_SLP_S4_L. Garbage or try to change U1800 by donor? thanks
  12. R

    820-00138 fan start, no chime, no display

    PM_PCH_PWROK = U1950/pin 5 = 3,4V R1947 is good 0ohm XDP_CPU_VCCST_PWRGD = 0V on R1800, maybe U1930 but can't find it PP1V05_S0_CPU_VCCST = 1,05V
  13. R

    820-3299

    sorry i copy just a start sequence find on a website. PM_PWRBTN_L fall when i short SMC_ONOFF_L, i tell you on previous message :)
  14. R

    820-00138 fan start, no chime, no display

    PM_PCH_SYS_PWROK = 3,41V i don't find the signal PM_PCH_PWROK because my board file is not the same like 820-00138 board. do you have the good brd file? where can find it? on vinafix is not good. thanks
  15. R

    820-3737 video issue

    do you try on external display?
  16. R

    820-3299

    finally i check power sequence like this example G3H/RTC rails + 32kHz RTC clock → {SRTCRST, RTCRST, INTVRMEN, INTRUDER#, DSWVRMEN} → S5 rails → S5_PWRGD → DPWROK → SLP_SUS# → SUS rails → RSMRST# → BATLOW# → PWRBTN# → SLP_S5# → SLP_S4# Some signal are not present on this board. all seems good...
  17. R

    820-00138 fan start, no chime, no display

    Hi, this board is clean no liquid spill, the customer say, the mac make beep memory after an install system. Now I have just fan spin, no chime and no display. i make this measure: PPBUS_G3H 12.8v SMC_ADAPTER_EN 3.38v PM_BATLOW_L 3.3v ALL_SYS_PWRGD 3.38v PM_DSW_PWRGD 3,4v PM_MEM_PWRGD 0,8V...
  18. R

    820-3299

    ok i have no pulse on all PM_SLP_Sx_L. i think it's power sequence problem. I try to find it this day. i have a question for power supply, can i use a external power supply and apply 12V on the board? without the real supply because it's hard to check signal on the iMac. thanks
  19. R

    820-3332 video problem

    ok thanks for your help, it work well. i try to read other forum thread but i'm not already connected to read all.
  20. R

    820-3299

    PM_PWRBTN_L fall down when i push button. PM_RSMRST_PCH_L stay always high
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