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Hi, I´m working on this board that is staying at .02 A ppbus_g3h = 12.59 pp3v42_g3h = 3.4 smc_pm_g2_en = pulsing 3.3 pp3v3_s5 = Pulsing 3.3 already changed smc and no change...

Hi, I have this board and has every single power rail on page 7 but PPVCORE_S0_AXG. Reprogramed the BIOS still no change I have all the voltages for the board to work, but it just doesn't. PLT_RESET_L = 3.3 PM_RSMRST_L = 3.3 PM_SLP_S4 = 3.3 PP3V3_SUS = 3.3 PPVCORE_S0_CPU = 1.1 amperage going up...

This board has a problem on PP3v42_g3h, when D1900 in place PP342_g3h = 2,2v if I remove D1900 it goes high at 3,42 checked all the resistors involved and their values are OK, the only other thing on that line is U1100 is it worth to do something else? Im using 820-3478 board view and...

Hi, this board had liquid damage around U2800 and found a short on PPBUS_G3H that was caused by C9081. Now the board is taking 20v @.08mAmps, can access DFU mode, but get error message when I try to restore it...

Hi, this board is not creating the EDP_BKLT_EN signal required to enable the backlight chip U8401, is there a way to make a jumper or something so the backlight work again? I know the signal comes from the CPU is there anything that can be done to fix it? I´ve already tried the monitor with...

This board had little liquid damage, and its not turning on, ppbus_g3h = 12.6 PP3V3_G3H_SOCPMU = 3,3 PP1V2_S3 = 0 PPVCC_S0_CPU = 0 PP5V_G3S = 5,13 PP1V5R1V35_S0_GPU_MEM = 0 PPVCORE_S0_GPU = 0 CPU_PWRGD = 0 PMU_ONOFF_R_L = 1,3 PM_SYSRST_L = 0 PM_PCH_SYS_PWROK = 0 PM_PCH_PWROK = 0 PLT_RST_L = 0...

This board is not creating this lines: PP1V_SUS PP1V8_SUS according to me U7800 should create those lines using some of the following that are present: ppbus_g3h = 8.70v PP3V3_G3H = 3.3v PP3V3_S5 = 3.3v PP5V_G3H = 5 v PM_SLP_SUS_L = 3.3v

Hi, this board had liquid damage on U5701, after replacing U5701 and components near it, the backlight started to fail fixed that too and left it to try it another day. Now it doesn´t turn on and it is stuck at .29 A voltages not present: PP3V3_S0GPU = 0 PPVCORE GPU = 0 PPVCORE S0 CPU = 0...

Hi I have this board which was liquid damaged by customer, first it didn´t turn on, then it turned on and had no trackpad or keyboard, now I changed U5701 / Q5701 / U5750 and have a working keyboard/trackpad but no backlight... I even have PPVOUT_S0_LCDBKLT at 55v, but no backlight, just get...

Hi, I got this board, it changes from 5v to 19,5v, tries to run, but when it gets to ,500A it goes back to 0 and stays there PPBUS_G3H = 12,64 PPBUS_HS_CPU =12,64 PPDCIN_G3H = 20V PP5V_G3S = 5,139 PP5V_S5_LDO = 5,139 PPVIN_G3H_P5VG3S= 12,64 PPVIN_G3H_P3V3G3H= 12,64 PPVIN_G3H_P3V3G3HRTC= 12,64...

Hi, I have this board beeping 3 times Voltages on U7400 6= 1,8 12= 5,1 16= 3,3 17=3,2 This board was messed with before, because it had a short on the line PPDDR_S3_REG_R caused by a bad resoldered ram, I changed the 4 chips, but it is still giving me the 3 beeps... I messed up a little with...

Hi, I have this board with a pulsing PP3v3_SUS @1,0-1,3v. U8020 and PP3V3_S5 and P3V3SUS_EN voltages are present and stable, changed U8020, no change... what can be causing this behavior? Any experience like this? when I heat the pch a little it turns on... should I reflowit with flux?

IM INJECTING VOLTAGE ON PP3V3_S0 AND WITH MY THERMAL CAMERA I CAN SEE THAT PCH IS GETTING WARM... IS THAT NORMAL BEHAVIOR WHEN INJECTING VOLTAGE? OR DOES IT MEANS THAT PCH IS DEAD?

Hi, I have this board with no all_sys_pwrgd, the voltages and values of the resistors around Q8150 are ok, but I still get .700v at PIN 5 and 8 and acording to me the correct value should be 1,07. at PIN 1 Q8150 I get .690v which I think is good enough. Already removed 1 by 1 the resistors from...

THIS BOARD DOESNT SHOW THE SSD, SO FAR I HAVE: PP3V3_S0SW_SSD_FLT = 3.3 SSD_RESET_CONN_L = 3.3 SSD_CLKREQ_CONN_L = 3.3 SSD_PCIE_SEL_L = 0V (WHEN SSD PRESENT) 3.3 WHEN SSD REMOVED SSD_DEVSLP = 0V SSD_PWR_EN = 3.3 PCIE_CLK100M_SSD_N = 0V PCIE_CLK100M_SSD_P = 0V TRIED A DIFFERENT SSD, SAME RESULT...

When I connect this board, it tries to go on and gets back to stand by, when that happens PM_SLP_S5_L pulses. So I can´t get PP3v3_s4 because of that. Call for a dead cpu?

Hi, I have this board and a weird problem... when I use mu PSU it turns on, I get a green light on the magsafe cable and everything seems to be ok. When I connected it to the original magsafe 85w it damaged U7100 and high and low mosfets, all where shorted to ground, what can be causing this...

This board turns on but doesnt do chime or show image... edp_panel_pwr doesn´t come high when display is connected... cpu gets warm and so does the memory chips... is it a dead cpu yet?

Hi, I got this board, it was working fine, I just cleaned it with isopropilic alcohol and now it doesn´t turn on. I get .56A at my PSU but no chime, image or POST. I have all the voltages present even PPVCC_S0_CPU but I get nothing... should I reprogram the BIOS? This is so weird, it was working...

Hi, this is the first iMac that I get to repair so I don´t really know where to start. It powers on but sometimes it shows image on the screen, replaced the EG card with a working known one and it didn´t show image, the I have 2 leds on on the board, the last 2 doesn´t turn on. Where should I...