Search results

  1. TCRScircuit

    820-00875 Dead

    I wouldn't waste time with this. These boards (00875 and 00840) are awful. Almost every one I see in my shop has a shorted CPU or does not post from a dead CPU.
  2. TCRScircuit

    820-2914 No image

    Same symptoms before GPU replacement?
  3. TCRScircuit

    2013-2019 MacBook Air A1466 / A1932 graphical glitching RESEARCH TOPIC

    That is a possibility, I will check with people and see if it is a netflix and safari issue alone. I have heard of this same issue on both 1466 and 1932, so I just wanted to see if maybe, both machines were running the same MacOs version #.
  4. TCRScircuit

    2013-2019 MacBook Air A1466 / A1932 graphical glitching RESEARCH TOPIC

    I have seen several of these machines that exhibit graphical glitches (typically green) while playing full screen video. The machine will otherwise behave normally with no other issues. I suspect this is either one of 2 things. A. Driver issue related to a specific MacOs version OR. B...
  5. TCRScircuit

    820-3332-a ...

    We use Unigine Valley to stress test machines. No issues software wise crashing on known good hardware out of thousands of machines. Was U8900 replaced before or after replacing the GPU? This could be a internal trace issue between GPU / VRAM / U8900 or bad / cracked ball under VRAM.
  6. TCRScircuit

    820-3115B No power

    Something isn't right with the SMC install. More flux and reflow it again. If it does not work, reball it or just grab a new one.
  7. TCRScircuit

    General question about reflow

    600-615C is too hot!!!!!!!!!!!! I use 430C at 120C. 1-2 min is too long, you should have most everything pulled within 30 seconds. See this video. This is a extreme case. These chips are likely the hardest to remove on the board due to the heatsink. https://youtu.be/_QC_KcnPQmE?t=274 Also...
  8. TCRScircuit

    820-3115B No power

    This is a bit confusing. You did replace the SMC on this board? With one with a ripped pad? This is obviously SMC related. What is SMC_RESET_L? As far as the keyboard issue goes, is PP3v3_S3_PSOC present on pin 22 and 49 of U5701?
  9. TCRScircuit

    820-3787 CPU FETs, what are the number of the pieces to replace

    6708 of course. Havent tried that hibernate deal. Will on the next ones i get.
  10. TCRScircuit

    820-3787 CPU FETs, what are the number of the pieces to replace

    I have had much better luck with these. I have done many, and none have come back so far. I've caught a few in testing that have still done it after the replacement, but so far none have come back. How I test these. At least 1hr of prime 95 large FFT and unigine valley running at the same...
  11. TCRScircuit

    820-2850 dim green light.

    SMC batlow should go high with a battery or the use of a 85w charger. 4.9v isn't right. That is a 3.3v signal. Are your meter batteries low? That reminds me. Are you using a real 85w charger with this? When the fan spins, does PLT_RESET_L go high?
  12. TCRScircuit

    820-2850 dim green light.

    This will likely suck. Recheck current sensing on pins 17/18 27/28 of the ISL should be 3-5 ohms / 20 ohms. Also, resistance to ground on CPU and GPU VCORE.
  13. TCRScircuit

    820-2850 dim green light.

    If you hold the power button down when it is doing this, does it start up normally? My very first board repair would do this, and you held the power button down, and it would start normally, ended up being a bad ISL. Had another machine that would do this, and power on normally if the power...
  14. TCRScircuit

    820-00840 5v not turning on

    It's normal. Of course it's going to get hot. Nothing is shorted. If you still have 5v when plugged in, plug in the USB C the other direction. Does it work? Something is likely messed up with the CD3215 replacement or the redriver replacement.
  15. TCRScircuit

    820-00840 5v not turning on

    OK, let's slow down here. You said it worked with a battery, and now you say PPBUS G3H is shorted. Does it turn on? If PPBUS is shorted and the CPU is getting hot then this is done for. If it turns on and you get image you are getting trolled by your meter.
  16. TCRScircuit

    820-00840 5v not turning on

    You replaced the redriver and both CD3215s correct? What does it pull without the battery plugged in? Both voltage and amps?
  17. TCRScircuit

    (SOLVED) 820-3115 no image

    Glad this is solved. Broken traces can troll you!
  18. TCRScircuit

    (SOLVED) 820-3115 no image

    Do you have continuity from pins 17/18 of the LCD connector to the other side of L9080? Black screen/backlight on these can very well be a dead PCH or crap under it. I presume you have tried another display?
  19. TCRScircuit

    820-00840 pulsing rails 20v at 0amps

    This could be many things. Given it's history, check all rails for shorts. If you have a short down stream, this will happen.
  20. TCRScircuit

    820-00045 no display

    I've had the same things with me. I think on some its possible that U4700 is half dead and hangs up POST. For the rest I have no idea
Top