Search results

  1. nbosna

    Ultrasonic Cleaner Stains

    Wondering if anyone has seen anything like this before. I keep seeing stains on my boards after running them through my ultrasonic cleaner and letting them dry - looks like this: http://imgur.com/kPMe9Tg. I use a CP500HT with Branson EC per Louis' recommendations. Is this a matter of not...
  2. nbosna

    [SOLVED]820-3115-B, No Chime, No Display, Fan Spins Faster and Faster

    I ran this one through another ultrasonic cleaner. It still exhibited the same symptoms, get a green light, and the fan begins spinning faster after 20-30 seconds. I installed it back into the laptop, and miraculously turns on and functions normally, with fan spinning at normal speed. You can...
  3. nbosna

    820-3476, Liquid Damage, No 3V and 5V rails

    Thank you for the response. I get 3.41 volts on pin 12 (SMC_PM_G2_EN), and between 0.6 and 0.8 volts on pin 23 (VIN).
  4. nbosna

    820-3476, Liquid Damage, No 3V and 5V rails

    Liquid damaged board for MBP 13" A1502, plugged into charger, I get a green, then orange light, no fan spin. I measured the following: PPBUS_G3H: 12.58 PP3V42_G3H: 3.42 PP5v_S5: 0 PP5v_S0: 0 PP3V3_S3: 0 PP3V3_S0: 0 Corrosion/build-up was around U7501 and Q7155. Cleaned up in ultrasonic, but...
  5. nbosna

    [SOLVED]820-3115-B, No Chime, No Display, Fan Spins Faster and Faster

    Sorry duke, terminology brainfart, I'm getting a solid 1.12V on ppvcore_s0_cpu
  6. nbosna

    [SOLVED]820-3115-B, No Chime, No Display, Fan Spins Faster and Faster

    A1278 2012 820-3115-B motherboard reported liquid damage. Board looks visibly OK, no corrosion that I see. I get a green light on the charger, and the fan spins normally for 10-20 seconds, then starts spinning faster. No chime, and no display. Bad SMC perhaps?
  7. nbosna

    Can anyone help identify this A1398 LCD

    had a spare A1398 assembly laying around and began removing the LCD. This is what I removed (http://imgur.com/4e2rTBh). Can anyone identify the year of this LCD? I ordered several replacement LCDs, and I was told one type will work for all models 2012-2014, and the other will work only for the...
  8. nbosna

    [SOLVED]820-3330-B Chimes and turns on, but no display

    With battery plugged in, I get 3.3V on pin 4 of the LCD connector as you mentioned. I thought maybe prodding everything has cleaned up some kind of minor oxidation. I turn on the laptop, and sure enough, the display works - excellent. I put it back together, but no more display - chimes, blinks...
  9. nbosna

    [SOLVED]820-3330-B Chimes and turns on, but no display

    Oy, idiot! I'm using a 65W for the 13" - back to the beginning of the thread - thank you.
  10. nbosna

    [SOLVED]820-3330-B Chimes and turns on, but no display

    0 voltage on R9010/11 as well. I tried checking the whole 3v3_s0 line, and 0 voltage everywhere. When I plug the charging cord in, the fans do not spin. If I plug in the battery, and turn it on, I get the chime, but no display - not sure if that helps the diagnosis.
  11. nbosna

    [SOLVED]820-3330-B Chimes and turns on, but no display

    Thanks for responding. There is no L9008 on this board - I think that's for the A1278 model, but I think I understand what you mean. The equivalent on this board is L9000, but as I mentioned there's 0 volts going through U9000, so none would reach the inductor L9000. I'm having trouble...
  12. nbosna

    [SOLVED]820-3330-B Chimes and turns on, but no display

    I get 0 volts on pin 2, 3, and 4 on the LCD connector, 0 volts on LCD_PWR_EN on U9000. Pardon the rookie questions, still learning to reason through a schematic. Next step would be to test wherever LCD_PWR_EN originates?
  13. nbosna

    [SOLVED]820-3330-B Chimes and turns on, but no display

    Louis, big fan, I appreciate all the content you're putting out for everyone to use. It's a big help as I venture into motherboard repair. Would love some help with a 2012 MacBook Pro A1286 (820-3330-B). It turns on, I hear the chime, but no display: 1) I tried another display - same result...
Top