Search results

  1. it-solve

    SOLVED: A1990 820-01041 No Audio, Macbook Speakers detected under Sound settings after liquid spill

    Although the measurements were identical to a comparison board, something in U6500 was holding SPKRAMP_INT_L low which must be the reason it was detected but not operating either of the channels. Although I reballed both amps. Went and replace it and now sound is back. For reference -...
  2. it-solve

    SOLVED: A1990 820-01041 No Audio, Macbook Speakers detected under Sound settings after liquid spill

    What I was referring to was in general. If a signal has _L or _H in the end does it means that to be enabled it needs low or High? Or does it means that it stays at that level as default and needs to flip to operate. I could not find reference to this and is not clear to me. So basically...
  3. it-solve

    SOLVED: A1990 820-01041 No Audio, Macbook Speakers detected under Sound settings after liquid spill

    I have Replaced U6500 and no low resistance at SPKRAMP_RW_AREG anymore SPKRAMP_RW_AREG - 0.55Vdc SPKRAMP_RESET_L - 0.048V - ..._L should stay low to operate right? I cant make sense of it. Diode readings are similar to another board I have. Also, to the left side channels. Cant figure out if...
  4. it-solve

    SOLVED: A1990 820-01041 No Audio, Macbook Speakers detected under Sound settings after liquid spill

    Device turns on and works. Except audio. Would T2 partial failure allow system to work ok?
  5. it-solve

    SOLVED: A1990 820-01041 No Audio, Macbook Speakers detected under Sound settings after liquid spill

    Very heavy liquid damage around U6300, U6500/50, and whole bottom edge of the board. Some around right USBc ports but they seems to charge Charge chip was blown, replaced/ Now Mac turns on and everything seems ok, apart than sound. Replaced U6300 and U6550 as I have 0.88Ohm resistance on...
  6. it-solve

    A2179 - 820-01958 - Heavy Coffee Damage - 20V 0.05A->0A->0.05A Fluctuating PP5V_G3S

    Active low being low when it needs to communicate (being active) and should not stay low most of the time? I get on both boards' same readings for these SPKRAMP_INT_L - 0.46Vdc SPKRAMP_RESET_L - 0.43Vdc To compare the signals I will need a scope, I have a signal analyzer but I doubt it will be...
  7. it-solve

    A2179 - 820-01958 - Heavy Coffee Damage - 20V 0.05A->0A->0.05A Fluctuating PP5V_G3S

    Went through majority of the test points mostly match, some doesn't but i dont have them marked as test points on the board view so cant confirm what they are for. Looking around these corroded ones in C6415,C6406 area. I do not have any short to the PPBUS_G3H there and chip is not shorting...
  8. it-solve

    A2179 - 820-01958 - Heavy Coffee Damage - 20V 0.05A->0A->0.05A Fluctuating PP5V_G3S

    Any suggestions? This is a data recovery case, The Customer is desperate.
  9. it-solve

    A2179 - 820-01958 - Heavy Coffee Damage - 20V 0.05A->0A->0.05A Fluctuating PP5V_G3S

    Tried DFU with no luck, both with a jumper on SOC_FORCE_DFU and a spare keyboard 1.8_G3S Pulsing 3.3_G3S not Pulsing Resoldered most MOSFETs and ICs that had liquid around. Reflowed U28/2900 too Reballed CD32's. They had quite a crap accumulated underneath. The last reflow BGA left is T2 but...
  10. it-solve

    A2179 - 820-01958 - Heavy Coffee Damage - 20V 0.05A->0A->0.05A Fluctuating PP5V_G3S

    I have reflowed the BGAs CD32s/U6400/U6860 which had liquid around. Is there other way to localise why PP5V_g3S is fluctuating without a short? Or do I need to keep pulling these BGAs out and resoldering them back?
  11. it-solve

    A2179 - 820-01958 - Heavy Coffee Damage - 20V 0.05A->0A->0.05A Fluctuating PP5V_G3S

    Merry Xmas, Healthy and Prosperous New Year. PPBUS_G3H ok PP5V_G3S - 5V -> 0V -> 5V T2 heats up and down. Heavy corrosion around the Tpad/KBD board Corrosion around: U31/3200, U3060, C6406/6415, R5410 area, U9060, Q7660/80, Q7065, Q7401, R7430 There are no shorts anywhere. U7800 Diode mode...
  12. it-solve

    820-00165 liquid damage around SMC 0.02A died after UC

    Just tried this morning and it turned on, I will test furthermore. I have UC'd only the SMC area, just to make sure corrosion is not underneath. Thanks again,
  13. it-solve

    820-00165 liquid damage around SMC 0.02A died after UC

    Seems all the drama happened around the SMC Corroded track on R5193/R5117/R5177/R5100 replaced and rewired broken joints U3710 had a bad track to SMC_OOB line, rewired that After all this was repaired, it turned on and seemed ok, so I ran it over Ultrasonic Cleaner, then 0.02A and dead...
  14. it-solve

    A1932 820-01521 5V 0.2A.

    I can see it gets to it. When I connect the usbc meter to the top port and Apple conf to the bottom one, closer to the trackpad. The usbc meter reboots after 10sec with the keyboard shortcut to DFU.
  15. it-solve

    A2485 820-02100 Liquid Damaged 5V 0.03A

    yes jumping at around 0.2-0.3V with removed RC260. PP5V_S2_MAIn - 0V
  16. it-solve

    A2485 820-02100 Liquid Damaged 5V 0.03A

    I can confirm that P5VS2TPS_PWR_EN is also oscillating P5VS2_PWR_EN too is oscillating PP1V8_AON - 1.79V
  17. it-solve

    A1932 820-01521 5V 0.2A.

    yes tested with only bare board with SOC_DFU_FORCE pull up to 1.8V. Also in the case with disconnected audio and battery only. There is no oxidation residue apart than U8200. But again it seems to be washed with something like aerosol can as feels oily.
  18. it-solve

    A1932 820-01521 5V 0.2A.

    Yes all SLPS2R are present from U7800 CPUAWAKE are at 0.75V SRAMAWAKE is at 0.8V 1.2, 1.8, 3,3 and 0.7 VDDCPU awake as well are present
  19. it-solve

    A2485 820-02100 Liquid Damaged 5V 0.03A

    Not turning on, a liquid around UF500, opposite side of U7700, underneath U5000 Corroded and knocked off R8170, replaced it. PPVBAT_AON - 0V PPDCIN_AON - 5,19V PPBUS_AON - 12.9V PP3V8_AON - 3.79V PP5V_S2_MAIN - Jumping voltage at about 2.5V PP1V2_AWAKE - Jumping too under 1V I dont see any...
  20. it-solve

    A1932 820-01521 5V 0.2A.

    Thanks. I have replaced U3100 with another one still stuck at 5V 0.23A on both ports. Still missing 1V1_LDO_BMC . Only different now under IR is that both ports seems to heat up T2 evenly, unlike before. Looking at the bootup sequence - https://logi.wiki/index.php/CD3215_Bootup_Sequence I went...
Top