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  1. TCRScircuit

    820-3115 power cycling and I don't know why.

    Right now im thinking the CPU is dead. There was corrosion on the fets and C7523 was burned. It worked fine in inital testing but I have a feeling it was dying all along. That would explain the power cycling as of right now. This one is a thinker...
  2. TCRScircuit

    820-3115 power cycling and I don't know why.

    Both nice and clean and at spec.
  3. TCRScircuit

    820-3115 power cycling and I don't know why.

    I had a 820-3115 come in with heavy corrosion on the edge where most of the liquid will come in. Cleaned all the areas up with flux and heat and ran it through the USC. All working. Replaced quite a few corroded and burned components and all was working. There was corrosion on the CPU fets so I...
  4. TCRScircuit

    820-2850 No PPBUS_G3H

    Probably bad ISL since it doesn't power on from Battery.
  5. TCRScircuit

    [SOLVED] 820-3435 - not seeing battery. boot from charger ok.

    Yep RIP SMC as Louis said. :(
  6. TCRScircuit

    [SOLVED] 820-3435 - not seeing battery. boot from charger ok.

    Diode mode to GND on CHRGR_CSO lines?
  7. TCRScircuit

    820-2915-B no chime no display

    Don't waste your time on it. You can try to reflow the ram in case it was dropped and has a dropped solderball. Still may be the GPU even after you heated it.
  8. TCRScircuit

    820-2915-B no chime no display

    RTC area? RTC power present? History?
  9. TCRScircuit

    820-2879 no power after ultrasonic.

    You replace the SMC and the MCP89 will be dead as well.
  10. TCRScircuit

    Macbook pro A1502 no screen

    Soldering the MagSafe adaptor to a regular laptop power supply was probably a stupid thing to do. Get a genuine apple charger.
  11. TCRScircuit

    [SOLVED]820-3115 - no green light after charged to 100%

    Willing to bet it's the magsafe board.
  12. TCRScircuit

    820-3330 short on 3v42

    Get it from donors... I have a 3330 with a SMC coming in that i bought from eBay
  13. TCRScircuit

    820-2936 no green light.

    PPBUS is 12.25... SMCs not coming on. What is SMC RESET_L measuring?
  14. TCRScircuit

    820-2915 Liquid Damage, All S0 Power Rails Present No Post

    So it has quarter fan spin? Check power to RTC and inspect clock chip
  15. TCRScircuit

    820-2915 video distortion,but not the typical kind?

    MUX may be bad? Reflow it
  16. TCRScircuit

    820-3476 3 Beeps not passing post

    Check if your ram is getting power if so, Preheat the board in the oven @275 for 5 min then put lots of flux and reflow the ram. If the Ram is not getting power, Investigate that.
  17. TCRScircuit

    [SOLVED] 820-3435 macbook air, green light , not turns on

    Before going further, Learn how to find a short. Here is what a buck converter is https://www.youtube.com/watch?v=B5eWpRFC9Aw&list=PLkVbIsAWN2ltOWmriIdOc5CtiZqUTH7GT&index=11
  18. TCRScircuit

    [SOLVED] 820-3435 macbook air, green light , not turns on

    Let's look at page 52 of the schematic... Notice the pattern?PP5V_S4RS3 Missing. PP3V3_S5 missing. PP5V_S5 low.. Let's think here... Why would a rail go low? Perhaps the buck controller is screwed up? Perhaps there's a short pulling the line down?
  19. TCRScircuit

    [SOLVED] 820-3435 macbook air, green light , not turns on

    PP3V3_S5 @ C3550 0v..... Hmm.... Let's think about that. What component generates your 3v and 5v rails?
  20. TCRScircuit

    820-3115-b powers up, starts loading os, then cuts power completely.

    Check Current Sense resistors in u7000 area
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