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  1. nik1981

    Not a Mac but a charging circuit issue

    I've spent the last week trying to sort my sons brand new Acer laptop for a charging issue after liquid damage. Originally it wouldn't turn on but I found shorting caps on the 19VB_CHG circuit. Replaced those with the same and the laptop fired up fine, works on charger or battery but won't...
  2. nik1981

    820-3115 No CPU Vcore

    Can I take another bios chip off of the same board EMC 2554 to check that?
  3. nik1981

    820-3115 No CPU Vcore

    I've checked all resistors around the SMC including the other side. Took ages but it seems they are all okay. Is there any way to narrow it down?
  4. nik1981

    820-3115 No CPU Vcore

    All SPI Bus series termination resistors test as schematic. Traces look good, not sure what to check next. I have PP3v3_SUS
  5. nik1981

    820-3115 No CPU Vcore

    Pin 1 = 12.22v Pin 19 = 5.06v Pin 29 = 5.06v Pin 46 = 5.06v Pin 47 = 3.33v Pin 48 = 12.26
  6. nik1981

    820-3115 No CPU Vcore

    R7402 = 149k R7403 = 181k So they seem fine
  7. nik1981

    820-3115 No CPU Vcore

    also PPBUS_S5_HS_COMPUTING_ISNS is 12.45v
  8. nik1981

    820-3115 No CPU Vcore

    I have an 820-3115 liquid damage around SMC. Originally no magsafe light. Removed and reballed SMC, now I get magsafe and fan spin with the fan at full speed after 5 seconds. CPU has a little heat in it after a min or so. ALL_SYS_PWRGD = 3.29v PPVCORE_S0_CPU = 0.00v I'm stuck with this one...
  9. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    Took off the pad, dug down and separated the short. It had burnt the fiberglass layers under it so bad that it was shorting under the pad. I've removed the short now and i'll attempt to run trace wires in its place instead
  10. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    Unfortunately its a short within the layers under pad 1of C7220 :( Not sure if this will be fixable
  11. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    It's pulling 2.42a @2v but nothing seems to be heating up
  12. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    Do you think maybe remove U7410,20,30 to see if shorted?
  13. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    Had to edit the last post as my readings were wrong
  14. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    The closest to 0.002ohms are L7410 @ 4.8ohms, L7420 @ 4.9ohms and L7430 @ 4.9ohms. L7210-7210 are both at 10ohms. The rest are 60ohms on a couple and Kohms or Mohms to GND
  15. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    0.002ohms PPBUS_G3H_CPU to GND
  16. nik1981

    820-00875 dead short on PPBUS_G3H_CPU

    Hi I have an 00875 board with an exploded C7222. Removed the capacitor and others around it on PPBUS_G3H_CPU. PPBUS_G3H_CPU is still shorting to ground with them removed but I can't locate the short anywhere. Its 0.000v on diode mode. I've tried a little voltage an some alcohol to see if...
  17. nik1981

    820-00165 liquid, no fan spin but orange light [solved]

    Swapped out LP8550. (looking at the state of the LVDS connector originally, I'm not surprised it was dead) now works perfectly. As ever @2informaticos thank you for your help.
  18. nik1981

    820-00165 liquid, no fan spin but orange light [solved]

    Actually.. tried one more time and got fan spin back.. I now have screen active but no backlight. I can see it booting OSX
  19. nik1981

    820-00165 liquid, no fan spin but orange light [solved]

    Nope, get green and orange light but no fan spin. I'll have to start again
  20. nik1981

    820-00165 liquid, no fan spin but orange light [solved]

    Okay, I'll heat it up and give it a couple of taps and little nudges. Its dancing while at reflow
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