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  1. J

    SOLVED - 820-3437 charging slowly 20:00 until full

    Yes sorry, sure here is the voltages: With magsafe 45W - no magsafe light: Pin 4 Q7010 - DCIN_ISOL_GATE_R: 0,769V PPDCIN_G3H at pin 5 Q7010 and pin 1 R7012: 0,769V DCIN_ISOL_GATE at the cathode of D7012: 0,769V PPDCIN_G3H_ISOL at the drain pin 1 of Q7010: 0,083V With magsafe 85W magsafe light...
  2. J

    SOLVED - 820-3437 charging slowly 20:00 until full

    Hi 2informaticos, R7012 is 64kOhms R7010 and R7011 are 100kOhms and 10kOhms Will replace Q7010 and the nano D7012 diode as corrosion may hit them in this area. But what's confusing me is ppdcin_g3h not showing up with 45watts charger... If it doesn't show up, I guess it means charger is not...
  3. J

    SOLVED - 820-3437 charging slowly 20:00 until full

    This board is driving me nut, it came back for no magsafe light. when I tested it it was working perfect until I discover that it won?t take 45W and 60W known good working chargers... it only work great with magsafe light with 85watts chargers. With battery removed and 45 or 65 Watts charger i...
  4. J

    Need new BIOS image for 820-00165 (seems corrupted, machines runs fine with donor)

    Hi Paul, Please try the first one, it's your original Bios with ME fixed in case it was corrupted. The second one is a new clean bios with all your FSYS info transfered into. Both should work, but i prefere always to try the first one in case there is differences I am not aware of. But never...
  5. J

    SOLVED - 820-3437 charging slowly 20:00 until full

    Without battery plugged in PPBUS_G3H= 8,56V With battery and charger plugged SMC_BMON_DISCRETE_ISENSE: 0V SMC_BMON_ISENSE: 0,060V On another working board with the same battery I got: SMC_BMON_DISCRETE_ISENSE: 0,152V SMC_BMON_ISENSE: 0,049V I replaced Q7155 and U5601 and that solved the...
  6. J

    SOLVED - 820-3437 charging slowly 20:00 until full

    This is a liquid damaged board It had No backlight, charging forever and restarting when you shut down laptop from macos Apple menu. I am leaving Backlight issue at the end. I focused on the restart issue and fixed it by reworking theses signals: SMS_INT_L SMC_TCK SMC_TDI SMC_TDO...
  7. J

    820-2936 starts only in smc bypass mode

    Pff this one was a bitch, I was about to put back the logicboard for no fix and discovered PP5V_S3 present at L7260 but missing at U7300! Run a wire and the board is back to life. What a luck after 2 hours + ultrasonic :( Thanks for everything
  8. J

    820-2936 starts only in smc bypass mode

    Hi 2informaticos! AVREF_SMC signal is 3.3V 2.1 v at VP0R output Witch looks good according to the voltage divider 2.77v at VD0R output Witch also looks good according to the voltage divider Thanks
  9. J

    820-2936 starts only in smc bypass mode

    This board had water damage on bottom side, but no corrosion. Doesn?t start (no fan spin) even if I am in S0 state. In SMC bypass fan does spin but no chime. I get green/orange light, ppbus is 12,56v. ISL was a little bit greenish, but seems to work good, with battery and charger. I checked the...
  10. J

    820-2850 with one ram slot ram giving 3 bips error second slot is ok

    Yeah solder on the corners look ok. No cracks
  11. J

    820-2850 with one ram slot ram giving 3 bips error second slot is ok

    Hi, This one is not liquid damaged, fixed charging circuitry and it's back to life, However, only one slot (bottom) is working. If I insert a ram stick in the top slot, it will give 3 bips errors. If I put no ram stick on both slots, I have the normal one bip missing ram. Only If I use the...
  12. J

    820-3437-B Not detecting MacOS (weird)

    Air 13?? 820-3437-B can be mid-2013 or early 2014 no issue there. Air 13?? 820-00165 start at 2015, 2016, 2017, don?t know for later. For Os not detected are you sure it?s not an EFI update / new Apfs file system issue? If not sure about it, you may try a clean install from internet with HFS+...
  13. J

    820-3476-A Won't Charge Battery/Run Off Charger

    You can also check scl/sda lines diode mode, they should be really close one each other, usually around 0,489-0,500. Check resistor values R5380, R5381. Check for any short on both lines. Make sure U7100 is well soldered.
  14. J

    820-3115 smc troubleshoot

    I am lucky on this one it was U7000 ISL fully shorted on sda pin! Diode mode on SDA is back to normal and exactly same as SCL line. I just have to put backa new ISL6259, test the board, sensors etc. You can consider it solved! Thanks 2informaticos?
  15. J

    820-3115 smc troubleshoot

    Oh so sorry! with fuse in place it was 12.22V with F7049 removed it was same thing 12.28V I am confused with macbook air:) there seem no short on ppbus_g3h with 0.424 on diode mode. Sorry about that. I just replaced U7200 and the board turns on an chimes! One variable less! U7200 was messing...
  16. J

    820-3115 smc troubleshoot

    Hello 2informaticos, for the internal short, there was a burning hole right next to R5410, ppbus_g3h was dead short to gnd. I gently scraped the burned hole and isloted the shorted track. This bring back normal diode mode 0,440 on ppbus_g3h. I had to reroute 2 wires to U5410 and of course to...
  17. J

    820-2850 can?t wake up after putting it in sleep mode

    Hello, looking for first steps I should look to for this issue. Laptop doesn?t wake up anymore after it enters sleep mode. Even when I restart it, it will stay stuck in sleep mode. Unless i disconnect magsafe + charger it will boot again. This happens with and without battery. Lost how to tackle...
  18. J

    820-3115 smc troubleshoot

    This one was water damage, no magsafe light, with two shorts : first on PP3V42_G3H (U7941) and second one was an internal short on PPVIN_S5_HS_OTHER_ISNS. Fixed these issues and we are back with green light but ppbus_g3h was 8.22V :( Before messing with smc, I checked smc_reset_l and it was...
  19. J

    820-3476 No PPBUS No PP3V42

    For your VIN being low, something is going wrong on 3V42 circuit, check carefully all resistors caps around U7090. Nothing wrong, no short with pp3v42_g3h rail? Yes you can disconnect R7005 to isolate ppbus_g3h. You can also remove D7005 and inject 16,5V on pad 3 of removed D7005 and check how...
  20. J

    820-00165 corrupted bios Bios?

    I kept original Me and Fsys but it did'nt work, same issue. So I opened my Medusa package and started playing with it. It ended up being an ME corruption, I just copied back the original non working Bios to the donnour board testing bios that was already soldered on the board. I tested it as...
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