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  1. J

    SOLVED - 820-02536 A2681 M2 Air - No power 5V 30-40mA

    This one has no liquid and just died suddenly. Inspected the board and found out C8430 dead shorted. Replaced the cap and no more short (0,442 diode mode value). However usbc meter is still showing 5V with 30-40mA. I noticed the rail PP5V_MPMU_BSTLQ_XW is only 2V, schematic says 5V but I don't...
  2. J

    A2681 - 820-02536 Air M2 5V 35mA

    This board came in liquid damage near the daughter board and slightly on the logicboard. Cleaned everything, checked for shorts and plugged in usbc charger, I see only 5V 35mA. Don't know where to start with this board. I took this measurements but it doesn't give me any clue and have no other...
  3. J

    820-4924 A1502 2015 PP5V_S3 PM_SLP_S4 missing

    Got this board and hesitated to repair it as they are becoming cheap. Opened the case and found a big burned spot on magsafe board and DCin circuit, no liquid at all. I restored all dc-in circuit: F7005, D7010, R7121/R7120 (sensing), R7105. U7190 was replaced also because I got 4.6V on L7195...
  4. J

    A2179 820-1958 No audio

    I had this board in for repair, a liquid damage one. Both speaker amp controllers on audio board and logicboard (U6400) were shorted. I replaced them and all shorts went away except for SPKRAMP_RESET_L it is shorted right from T2 U3900. Audio volume button is not greyd out, I can put it up or...
  5. J

    820-00281 A1707 missing PP3V3_SUS

    I got this board repair witch original issue was full shorted PP1V_PCH_REG_R. Traced that up to the PCH. Customer stated liquid damage but I don't see liquid anywhere. I replaced the PCH and short gone, cleaned also ME. When I power up the board I get 20V 90mA. I am missing PP3V3_SUS. At U8200...
  6. J

    820-01958 A2179 no power

    This board came with no liquid damage. It was stuck at 5V. Noticed a short on the PP1V1_S3 it was coming right from U2300 ddr chip. When I removed the shorted chip the short was gone, I had to replace both of them as it was Micron 8GB ddr and I had only Hynix 8GB ddr known working donnour. I...
  7. J

    a2289 820-01987 liquid damage

    This liquid damage board was not powering on. PPBUS_G3H rail was fluctuating between 12,56V and 12,23V and PP5V_G3S was following the same patern between 5V and 4,89V. I cleaned/reflowed U9080 and U9000 area and compared some diode value with samet esting board. After that 12,56V became stable...
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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...
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
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