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When U7400 isn?t on the motherboard the voltages don?t pulse and the fan spins continuously but there is no vcore because u7400 isn?t there to generate it i put u7400 back and tried smc bypass and no change still power cycling only the fan spins faster i tried to connect a USB mouse and it...

yes i compared and it's the same. i noticed U1800 gets warm, but i think it's normal? where should i start looking or testing? is there anyway to check to see if U7400 is functioning? since C7511 was burnt the U7400 can be shorted. i tried to remove U7400 and turned the motherboard on and the...

"unfortunately i did try to turn it on without C7511" Do NOT do it again. You are very lucky if Q7510 is not shorted now. i think L7510 is shorted to ground since i get 1.6 ohm? i soldered Q7510, Q7515, Q7550, Q7551 back on the motherboard, are they should i remove them again and check the line...

thanks for your reply "checked with diode mode and it shows 0,001 and with ohm mode it shows 1.6 ohm so i think it's shorted?" Do you mean between cap pins, or L7510 to ground? L7510 to ground I hope you didn't power on the board without C7511; also check R7511 integrity. i tested R7511 and...

hi everyone i have a Macbook pro 2012 820-3332_A came in as water damage device, it used to turn on with no keyboard connected so we replaced keyboard and it worked for awhile and then it stopped working, it shows green/orange light and fan spins for a second then stops then spin again and...

i measured on F7140 and it has 8.5V also PP18V5_DCIN_ISOL_R shows 17V

hi everyone I've got a Macbook air 820-3437-B water damage didnt turn on at all U1950 was corroded replaced it and the mac now turns on and charge but i noticed when i connect the charger with no battery connected it shows orange light but the fan doesn't spin and it doesn't turn on even if i...

Thanks for that mate you saved my time i doubted the CPU itself can be shorted but i wan't sure, now i can give up on this and work on something else thanks alot

i injected 3.7V to PP1V05_S0_PCH_VCCACLKPLL_R and U8080 got hot but U8080 is not connected to PP1V05_S0_PCH_VCCACLKPLL_R directly so i checked the cap beside it (C8081) that has P5VS0_FET_RAMP on it and it was shorted to ground i removed U8080 the short on P5VS0_FET_RAMP and...

Thanks heaps i programmed the Bios with this file and it worked, thanks so much for your help, i would appreciate if you answer one more question please: so in next time if i face same problem do i need to create a clean ME and write the serial in a working Bios and install it and it will work...

yes i already did that and pin two is shorted to ground and when i inject voltage in only the CPU gets hot

Thanks for replying back, i removed all the tantalum caps and the short is still there there are some iC's on s5_computing_isns they can cause the short but i'm afraid of the PCH itself is shorted from inside, i looked for corrosion around CPU and it looks clean

hi i have got a macbook air 820-3437-B with liquid damage when you connect it to the charger green/orange light turns on but fan doesn't spin there was some corrosion around U6100 and SMC so i cleaned it up, on L7140 i got 1.8V that meant so i removed L7140 and pin number 2 is shorted to ground...

Thanks for your reply here is the working Bios File link https://www.4shared.com/file/ke0hsur8fi/820-3437-B-Good.html and here is the Password for not working macbook air : C1MNQ370G086

Hello everyone I got a macbook air 820-3437-B with some liquid damage around U6100 and U1900, when you connect it to the charger the fans spin and green/orange light turn on and it light up USB mouse i tried to clean all the corrosion around U6100 and replaced U1900 but no luck then i replaced...