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  1. J

    820-02016 A2337 liquid damage weired behaviour

    Hello 2informaticos, This board was liquid damaged, with shorted P5V_PS2 line at U5700, shorted UP710, burned LP670 due to the screen and burned trace related to backlight ic UP800. Even the screen was not powering on because internal lcd IC chip was shorting PP5V_SW_LCD. I was able to fix all...
  2. J

    820-01521 A1932 no power 20V @ 75-85mA

    I have this board with no liquid damage, stopped on its own as customer reports. PPBUS_G3H 12,62V PP3V3_G3H 3.3v PP3V3_G3H_RTC 3.3V PP5V_G3S 5V PP3V3_G3S 3.3V PP1V8_G3S 0V / 0.318 PP1V8_S5 0V / 0.466 PP3V3_S5 0V / 0.320 PP1V1_SLPS2R 1.1V PP1V1_SLPDDR 0V / 0.365 Coils around PMIC PP1V8_SSD...
  3. J

    liquid damage 820-01814 A1990 stuck at 20V 100mA

    I have a Liquid damage board around U7230, Power button, U9000 and U9080 areas. Cleaned all corrosion (minor) and replaced R4922. 20V on usbc meter with 100-95mA on all ports. With battery current draw is only 500-700mA however battery seems a little bit inflated... P1V1SLPS2R_FB 1.1V...
  4. J

    820-00165 missing PM_SLP_S4_L

    This one has no liquid, is clean and just died one day on its own. Customer powered it off and it never powered on again. I 've checked all these signals for PM_SL_S4_L and they are present. PPVRTC_G3H RTC_RESET_L PCH_SRTCRST_L PCH_INTVRMEN PCH_DSWVRMEN PCH_CLK32K_RTCX1 PP3V3_S5 PM_DSW_PWRGD...
  5. J

    820-00840 A1708 PP3V3_G3H pulled down

    Liquid damage on this one, I found it difficult and time consuming. 1) It had a full short on C6990 PPVIN_G3H_P3V3G3H, replaced the cap and short gone. 2)Next, it had PP3V3_G3H low voltage around 2.2V. Diode mode was showing 0.340 very similar to other working boards however resistance to...
  6. J

    820-01521 A1932 boots only in safe mode

    Hi there, this was a liquid damage with PPBUS shorted at u7430 (Pin 5 CPUGT_BOOT2_RC was burned shorted with ground along with pin 6 PPBUS_HS_CPU). There was also minor corrosion at other spots like PMIC an TPS51980. Replaced U7430 and short gone. Cleaned also corrosion everywhere. The board is...
  7. J

    SOLVED - 820-01521 (A1932 2019) 5V 0.16-0.20A

    Got this logicboard with liquid damage, initially both CD3215 were shot, first one with one LDO shorted and second one with PP1.8V_SLPS2R shorted and an LDO shorted. First port was 5V 0A, second port was 5V going 0.2 to 0.43A. Replaced both CD3215 and I have no more short. Board is now stuck...
  8. J

    820-00840 No internal lcd image but Backlight present

    This board was liquid damage, no power, with the lcd flex burned, connector on the board is intact. I Fixed the liquid and managed to get the board to boot, however there is backlight but no image. I tested different screens known to be working. I also ruled out lcd flex cable, ssd, pram and...
  9. J

    820-02020 (A2338) liquid damage missing PP3V3_S2

    I received this logicboard with water damage. Initially it was stuck at 5V, ISL6294 had to be replaced and I restored the sensing resistors and traces witch bring back 20V and it is now able to charge a battery. Without the battery it stabilizes to 0.40A and cycle again . The fan spins very...
  10. J

    SOLVED - 820-00840 A1708 shorted U2800

    No water damage, this board was not powering up because it had PP0V9_TBT_X_SVR and PP3V3_TBT_X_S0 shorted to ground. Removed R5640 to isolate PP3V3_S0 and board powered on fine and charged great but obviously no usb Data or HDMI output. I replaced U2800 with a preballed one and put back R5640...
  11. J

    820-01521 usb-c J3300 connector soldering

    This board came with liquid damage on the ports side, the flex and the connector (port A portion) on the board were burned and shorting the 20V rail. I Replaced the flex and the connector on the board and the short went from the 20V rail. The laptop boots ans charges. However when charging the...
  12. J

    820-3330 manual serial replacement Bios edit

    This 2012 15'' 820-3330 was brain dead with all rails, not booting, no usb mouse activity. I read the bios with the medusa and had an "Error read blockxxxx not found..." (apologies didn't write exactly the error)... Tried a random testing 820-3330 bios and it worked and booted correctly. I...
  13. J

    820-01987 all power rails but no boot

    Got this liquid damage board. I have 20V on usb-c meter. With battery I get 20V 2A so it seems charging well, the fan spins also with and without charging cable. Without battery I get 20V 0.55A. Board reacts to power button, opening the lid, pressing the trackpad or a keyboard key. I can see...
  14. J

    iMac A2115 2019 27'' 820-01236 EFI and hard disk detection

    This iMac comes from companies returns. It was EFI locked, I did the mistake to solder the bios to an adapter and read it with the medusa 3. Instead of getting an incompatible error message because the medusa 3 doesn't support it (at least the firmware I have), the medusa read only half the chip...
  15. J

    A2289 820-01987 liquid 20V 0A

    Got this board slightly water damaged, It is stuck at 20V 0A. PPBUS_G3H is 12,60V PP3V3_S5 is 0V and no short diode mode is PP3V3_G3H_PMU_VDDMAIN 3.3V PP1V1_SLPS2R 1.1V PP1V1_SLPDDR 1.1V PP3V3_G3H_RTC 3.3V PP1V8_SLPS2R 1.8V PP3V3_AWAKE 3.3V PP5V_G3S 5V PMU_ONOFF_L 3.3 V I must admit I really...
  16. J

    820-00840-A A1708 20V 0A no PPBUS_G3H

    This board was liquid damage with 5V 0A. Corrosion at cd3215 and nearby, also the PI3USB32 chip (the one we don't see on schematic &brdvw) was corroded. Reflowed both of them and replaced all resistors around both CD32s. Now I get 20v 0A and ppbus_g3h 0V with no short (diode mode 0,410)...
  17. J

    820-01598 - 2020 A2159 shorted Internal ssd RIP?

    This board was 5V 0A with PPBUS_G3H missing and full shorted to ground. No liquid at all. Traced back the short to U9080 TPS62180 ssd's regulator, it was visually totally blown. Once I removed the short on PPBUS_G3H I noticed both SDD nands U8600 and U8700 were totally shorted (very hot)...
  18. J

    820-00840 20V 0A in S0 state

    This one is a liquid damage board. PPBUS_G3H is 13,06V, I got 20V and it charges the battery just fine. Without battery it is stuck with 20V@0A I am in S0 state and all rails on the power rail page are present except for the cpu: PPVCCPU_S0G = 0V PPVCCSA_S0G = 0V PPVCCGT_S0G = 0V On U7800...
  19. J

    SOLVED - 820-01521 air retina stuck at 5V 0A

    This one looks clean, I have 5V 0A. PP1V8_SLPS2R is missing and diode mode is 0.330 seems a little bit off from 0,390 so I am not sure... resistance to ground is high on both boards arounf 500kOhms. PPBUS_G3H is 0,42V with no short, diode mode is 0,455 same compared with other board. PP3V3_G3H...
  20. J

    820-00165 doesn't power on with magsafe

    This logicboard had water damage causing backlight issue, crap near SMC and ISL6259 but no heavy damaged components. Cleaned everything reflowed SMC to make sure. At this point, it boots all ok with battery, it charges when magsafe is plugged in. AHT test doesn't show any error. It will start...
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