Recent content by isc

  1. isc

    820-4924 NOT POWER ON

    "Some people complain this board didn't start without both charger and battery connected. " yes exactly true must both be connected. it works fine but i replace both 7100 and 7501 thanks for your support.
  2. isc

    820-4924 NOT POWER ON

    PCH_INTRUDER_L 3.04v , and PCH_INTVRMEN 3.23v. PM_SLP_S5_L , PM_SLP_S4_L , PM_SLP_S3_L PM_SLP_S0_L none of them pulse when i trigger SMC_ONOFF_L stay at 0v level .
  3. isc

    820-4924 NOT POWER ON

    PM_PWRBTN_L , SMC_ONOFF_L , are 3.34v PCH_SRTCRST_L , RTC_RESET_L are 3.3v PCH_CLK32K_RTCX1 is 0.43v PM_PWRBTN_L drops to 0.36v when SMC_ONOFF_L triggered
  4. isc

    820-4924 NOT POWER ON

    PCH_DSWVRMEN, PM_RSMRST_L , PP3V3_S5, SMC_PM_G2_EN, S5_PWRGD, S5_PWR_EN, all 3.33V but P5VS3_EN, P5VS3_PGOOD is 0V what else to test?
  5. isc

    820-4924 NOT POWER ON

    S5_PWRGD, SMC_S5_PWRGD_VIN, PP3V3_SUS ARE 3.34V. BUT ALL_SYS_PWRGD LOSSED,
  6. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    Fan starts normally and rapidly go to full speed due to CPU gets hot. I try more than SSD all not detected in Disk Utility and its works fine in other machine properly. REBALLING SMC THEN REFLASH BIOS FIX THE PROBLEM THANKS 2informaticos
  7. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    Also PM_BATLOW_L control by pch may be cpu chip defective? note: mac can boot from battery but ssd not be detected and temperature of cpu is very high and fan full speed spaining.
  8. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    I check it 10k ohm and fin connected to surrounding components and the impedance between PM_BATLOW_L and ground is about 3M Ohm, also i check PP3V3_S4 transistor Q3000 no problem.
  9. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    Yes I use original charger and test other charger but the same situation When I trigger SMC_ONOFF_L pulse of PM_PWRBTN_L drop from 3.41 to 0.34 but no boot up fan not spin IT STARTS NORMALLY FROM BATTERY BUT NOT DETECTS SSD. I APPLIED SMC RESET AND PRAM RESET BUT NOT BOOT FROM CHARGER
  10. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    ALL TESTS ON AC ADAPTER ONLY PM_BATLOW_L --- 0.03 PP3V3_S5 --- 3.33 PP3V3_SUS --- 3.23 PM_RSMRST_L --- 3.30 PM_PWRBTN_L --- 3.41 PM_DSW_PWRGD --- 3.41 PCH_DSWVRMEN ---- 3.23
  11. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    Thanks for your reply Resistance between pins 17/18 2.4 ohm 27/28 14.9 ohm. U7100 voltages; pins 1, 0 2, 14.37 3, 3.88 6, 0 9, 0 12, 3.41 13, 3.38 14, 3.38 15, 0 17, 8.58 19, 8.58 20, 5.02 27. 14.37
  12. isc

    Macbook Air 820-00165 not work from adapter and works on battery

    when AC adapter connected fan not spain and charging led turns to red without attaching battery , when battery is attached charging led go to green and macbook works ,when i remove battery mac still working , in other hand macbook boot up and ssd not recognized and cpu temperature is so high...
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