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  1. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Waiting on board from China. I took q7110 off of the board and it didn't get rid of the short on PPBUS_G3H still have around 140 Ohms
  2. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Sorry that was to ground I think this is right Q7110: S1/D2 --> D1 = 0 Q7110: S1/D2 --> S2 = 472 Q7120: 1 --> 4: 636 Q7120: 1 --> 6: 634
  3. O

    820-00840 won't turn on

    Both caps seem fine
  4. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Q7120 Diode = 205 Q7710 Diode = 445
  5. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Red on ground = 203 black on ground = 212 Yes PPBUS_G3H = 4.6V How do you check if Q7110/20 are good ?
  6. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Could that be a short from the chip
  7. O

    820-00840 won't turn on

    What are the filter caps... sorry kinda new to this
  8. O

    820-00840 won't turn on

    The resistance between PP3V3_UPC_XA_LDO and PP3V3_UPC_XB_LDO = 17.6 OHMs
  9. O

    820-00045 12" Retina PPBUS_G3H is 20v

    PPBUS_G3H = 4.6v it only has 147 OHMS of resistance
  10. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Now its not even getting 20v
  11. O

    820-00045 12" Retina PPBUS_G3H is 20v

    Resistance between R7120 and R7150 is 113 KOhms
  12. O

    820-00045 12" Retina PPBUS_G3H is 20v

    PPBUS_G3H is 20v, and I've narrowed it down to the u7100 chip because that is where it gets created, but the schematic is very confusing. It's getting power because it's letting power through, but I can't tell if its a buck converter afterward or the chip itself. The schematic is very confusing...
  13. O

    820-00840 won't turn on

    all three are showing around 8.6 OHMS C3208, U2890 and PP3V3_UPC_XA_LDO Resistance to ground
  14. O

    820-00840 won't turn on

    C3208 -- 8.6 OHMS C2890 to ground resistance 8.7 OHMS PP3V3_UPC_XA_LDO -- 8.5OHMS to ground
  15. O

    820-00840 won't turn on

    U3200 is still receiving 4.97 V
  16. O

    820-00840 won't turn on

    R7020 PIN 1 and 2: 0V nor pulsing u3200 chips: PP1V1_UPC_XB_LDO_BMC = 133.8 KOHMS PP1V8_UPC_XB_LDOD = 63 OHMS PP3V3_UPC_XB_LDO = 9 OMHS Yes it has been dropeed also an update its not reading any voltage for PPDCIN_G3H anymore
  17. O

    820-00840 won't turn on

    Sorry about that, bear with me I'm learning very quickly all sorts of stuff I can't keep track of it all lol, but okay I'll check. C3121: Diode - 568 F3000 and F3010: 4.97 V
  18. O

    820-00840 won't turn on

    PPDCIN_G3H: C3121: 116 KOhms, 1.97V C8121: 146 KOhms,1.99V C8123: 135 KOhms, 1.72V
  19. O

    820-00840 won't turn on

    Would I have to replace this with the exact same resistor from a donor board or what could I put there?
  20. O

    820-00840 won't turn on

    just checked the first one on the board that I saw and it appears that C3121 is missing completely. No voltage on PPDCIN_G3H anywhere else on the board.
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