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Hey, this one is the second time it comes back!!! First time the problem was C7376 shorted i replace the capacitor and realize the machine only work's with my fake charger! I replace the Q7180 2 times no changes, only works after to replace r7012. After 2 weeks this one comes back with same...

Hey, This one is fixed! it was not making sense this symptoms!! I double check the board and found R7821 pin 1 with a little corrosion! i replace the R7821 and the machines work's normal!! Thank you!!!

this by serial number is early 2014! i think the asd tests only goes to 2013 right ?? tis one it's rare to pass image.. when don't pass image fan continues sniping! i try to start in bypass mode and same history only fan spin!! with or without battery! you have a bios for this model with...

i have a known good battery here! now, even with a good battery i have the issues i say above! with only battery or charger or with bought the machine "some times turn on some times no! When start work's perfectly but when i turn it off and try to turn on again i can see the fan sniping 1 sec...

Hey, working on 820 3437 motherboard, No liquid damage. corrosion and no one touch on this motherboard before me! i don't replace any component too because i need first your opinion! This one first time i had in store come with problem no charge and goes off suddenly but i realize that...

already test this board in other working mac (2012), and no changes! Fan sill working in maximum! the only errors i have is TH1H AND this: https://drive.google.com/file/d/1YMHr6rt1loALq7D03BVuirdSYruJMdNm/view?usp=sharing ALS ? what you mean? J3402 checked and it seems to me that it's...

VP0R - Fixed - (replacing Q5300) IO'R - Fixed - (Replacing u5410) TH1H - non Fixed !! already replace u5520, R5520 = ok and traces, R5521/22 = ok and traces! (This area don't have any corrusion). already replace Q5520 and check traces to u5520 it's ok and for descharge i solder 2 wires on...

coming back to this, and what solve the problem was replace 51125! On this moment the machines turn's on but show this errors on ASD testes! https://drive.google.com/file/d/1-ndgFdoxmL5qRc0CpkqaplzaDmeHUnup/view?usp=sharing can you advice me what can be?? thanks

Thank you Mr.Vali ! i agree with you.. i hate this new models with PCH integrated in CPU! If the PCH was separated off CPU i can easily replace for a new one.. but this processors are the only ones i don't know to remove without bent! You can close this post Best regards

hey, without U6200 this board don't turn on! only turn on the first led! Could it be bios problem? i think, I will assume as a processor problem!!

Yes i check for usb activity and I assure you that it has no connectivity. already check in exernal monitor as also with original LCD! when i turn on the motherboard with only DC power supply only consume 0.6A .. already try to boot in bypass but same history no usb activity! It's not the...

PP1V2_S3 = 1.193V ALL COILS have voltage!! this one don't have external rams! Rams it's onboard! thanks

3V3_S0 - 3.3V 5V_S5 - 5.072V PPCPU_VCC_S0 = 1.742 (BOUGHT COILS) PP1V05_S0 = 1.050v

Hey, working on 820 4668 and this one came with the problem don't turn ON! "only with first led on" i connect the power supply on board and i noticed that u6201 get's hot! i try to replace for a new one but went wrong the component "burn" again but the machine turn's on without press power...

Yes i did! i have already tried 3 new Q7180 and same history the resistence float!! i remove Q7180 of working board and i measure R7180 and i noticed that resistance don't float! i think the problem only can be on ISL6259 or the connection pin2 R7180 to the gate Q7180! But the problem is U7100...

hey, after run the ASD the machines don't show any error! but even worse is that the laptop started working well after that! i have tested this mac on last 2 days and he works well with battery + charge and only battery! I have a lot of fear in these cases. i don't want to send this mac for...

hey , already replace q7180 for new one no changes! R7180/R7181 - resistance float 21k - 55k check with another working board and the values don't float! What could be wrong? R7185/86 - 470K/330K

Hey, working on 820 3476 no charge! already repair this one with C7198 shorted to ground. i replace for a new one the machine comes to life but after 1 week came again! now, with only charge the machine work's well! with battery + charger i don't have green light and don't start! fake...

hey, with battery + charger - error asd: https://drive.google.com/file/d/1MAj4Xm4osN1vx3xDQiJdyCAs7x-oQMbF/view?usp=sharing

Yes already test a good battery!! i try to boot with external HD with internal disconnected and with battery freeze even without external HD or internal HD! but without battery works well on internal HD or EXternal HD! If i run the mac without battery when I'm on osx, plugging the battery...