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    A2179 820-01958 no audio from speakers experimentation

    So I had a bit of free time to look through some of my boards with weird issues and I had this 820-01958 which had sound only from headphones - no sound from speakers at all. Troubleshooting got me to SPKRAMP_RESET_L having an odd diode mode reading (0.002) and 20ohms to ground. Obviously went...
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    Macbook Air A2179 820-01958 Liquid Damage

    So I have an 820-01958 in for fixing now - was liquid damaged but customer neglected to tell us this before we opened the device and found it. So we had liquid damage and a burned port going to the type c ports - we also had liquid damage around the top CD3215 controller. I've replaced the...
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    820-02098 Water Damage, Charger Stuck 5V 0.2A Draw

    Got an 820-02098 in which had liquid damage. I've gone through the board under the microscope cleaning all areas I could find any issue with and i've run the board through the ultrasonic. I ran through the power on sequence on the repair wiki and found that PPBUS_AON was shorted - i've...
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    820-1521 Dead Stuck at 5v

    So I got an 820-1521 in today - completely dead no sign of liquid anywhere. No damage visible - the machine is stuck at 5V on both ports. PPBUS is 12.31 PP3V3_G3H_RTC is present. PP5V_G3S and its associated enable is missing. Awake and Sleep voltages are also all missing. Not detected at all...
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    820-01949-07 Not starting up

    Got an 820-01949-07 in today - problem is it won't start up - stripped it down to just the board and charger and it takes 20V 0.09A current draw. Popped it under the thermal camera and the only thing which is heating slightly is U9080 - nothing visible shorted on the NAND power lines either...
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    820-00850 Left Fan Won't Turn off and runs full speed

    So i got an 820-00850 in today - was originally fully shorted out stuck at 5V which I identified to a burned cap. Now the board turns on and works fine but the left fan as looking at it from the bottom runs at absolutely full speed (right one working normally) and also continues to run after the...
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    820-00165 Won't Turn On

    Posted this in the wrong section by accident somehow so apologies for that! Reposting here: Got an 820-00165 here on the bench which is causing some confusion. Green Light is there which turns orange as normal, ppbus present 8.6V. Visual inspection revealed tiny amount of corrosion around...
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    820-00165 No Turn On

    Got an 820-00165 here on the bench which is causing some confusion. Green Light is there which turns orange as normal, ppbus present 8.6V. Visual inspection revealed tiny amount of corrosion around u1930 - pulled this off replaced from a donor board and still no power. Pulled it off again and...
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    820-00165 PP3V3_S0 Low

    so i've got an 820-00165 in which had no power - I located a short on PPBUS_G3H and blown F7140. Located the short down to a shorted out cap and replaced, also replaced F7140 after confirming there was no further short. Board powers up enters S0 state has fan spin but CPU VCORE is missing also...
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    A1990 No Image After Liquid, Board Chimes!

    So i've got an A1990 with I think it's 820-01041 (will have to double check that) board. It was liquid damaged top area of the board above the cpu. Also the main screen cable was not damaged but the backlight cable which goes from the screen on one side was corroded. I have replaced the...
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    820-3536 No Display

    Got an 820-3536 in today with no display. System chimes as normal but there is nothing on the internal screen. Visual inspection revealed some liquid damage on the JTAG connector which has been cleaned up, i've also cleaned the screen connection and tried another LCD - still no display. I'm...
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    820-00430 No Power

    Got a bit of a strange one here 820-00430 iMac 21.5" Logic Board. We have replaced the PSU in this iMac previously a few months back but it has been brought back in with no power - no lights on the logic board but the PSU is outputting 11.85V and PP12V_G3H is present. PP12V_S5 is not however...
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    820-2850-A Won't start

    Got an 820-2850-A board in last week which the customer told me was intermittently not charging. Was no green light on it at all. Found a problem with the ISL6259 (DCIN Pin3 was 3ohm short to ground when ISL6259 was on board) which i've replaced and now getting the green light but it still wont...
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    A1534 2015 SSD Not Writable

    Got an A1534 2015 edition with 250gb SSD and whilst the SSD is detected in internet recovery and also in my test external ssd with mac os it's reading as read-only and I cannot erase it, format it or partition it. I'm presuming this is a dead SSD and assuming this is there any possibility of...
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    820-01521 Water Damage No Display

    So i've got an 820-01521 in today from a Macbook Air which was water damaged. Fixed the short on ppbus which was preventing it from turning on, it switches on now and works on external display but nothing on the internal screen. The LCD connector is clean and no sign of liquid there however Pin...
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    820-01700 U5450

    So today I received in an 820-01700 from a Macbook 16". Is liquid damaged but only in a small area of the board around U8400. I've found U5450 is completely burned to the point that even the traces on the board aren't there and will need to be repaired. That being said does anyone know where I...
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    820-3302 Wont start

    Got an 820-3302 today - won't start up - there is one green diagnostic led - when I press the power button the fan spins a little then stops - no activity on any other diagnostic led's that I can see. Nothing immediately visible i'm wondering if this points to a PSU issue?
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    820-3787-A shutting down

    Received a Late 2013 Retina Macbook Pro 15 inch today. It's randomly shutting down which I have replicated. I've read around and i'm seeing U7310 listed as a common failure point on these boards. The only issue i've got then (assuming correct diagnosis) is that I cannot find the recommended...
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    820-00875A Pulsing S5 rails

    Another liquid damaged macbook in today this one 820-00875A. Was a lot of liquid damage focussed around keyboard connector. Keyboard connector was burned and has been replaced. Board has been Ultrasonic'd for 4 minutes. The issue is the machine won't start, the S5 3.3V and 5V rails just pulse...
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    820-00840-a Wont start missing PP5V_S5

    so i've received a liquid damaged 820-00840-a in today. Liquid damage was focussed around the U7650 area. I've cleaned it all and visibly inspected the area - resoldered U7650 as pins 31 and 26 were not shiny anymore. If I connect charger it negotiates to 20v as expected but with a tiny spike...
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