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Hello everybody I have 3 different 820-2828 board with iMac 27" same issue, - sometimes when load OS reboot - sometimes when waiting login password enter reboot - sometimes when working simple app like safari What we tried - known good Video board ( pulled from working machine) 3 different...

Hello every body I m working on 820-3115 turn on when charger plug. I tried; Pram reset SMC Reset Known good charger and battery Replaced SMC and ISL Replaced BIOS Tried with no connected keyboard ,trackpad. But nothing change , Shutdown computer normally when pluged charger runs on again...

Hello everybody I m working on liquid damaged 820-3115 board with no green light problem PPBUS_G3H = 12.26V PP3V42_G3H = 3.48V SMC_RESET_L = 3V SMC_BC_ACOK = 3.4V ADAPTER_SENSE = 3.4V P3V3S5_LL = 0V SMC_ONOFF_L = 3.4V no 5v and 3v enables Tried 5 different SMC,known good Magsafe board and...

Hello everybody Working on this board wtih fan spin&stop loop. I don't know history but worked some one on it. (not liquid sing or like that) PPBUS_G3H 12.6V and stable PPVRTC_G3H 3.3V and stable PP5V_S5 5V and stable PP5V_S3 5V then 0V over again PM_SLP_S5_L is up and down continuos.. but...

Hello I m working on 820-3476-a few months ago liquid damaged and cleaned by another service. Board worked 1 week only then stopped . Machine working only safe mode (when you press shift key machine booting) other way when you see desktop or login screen freeze computer. Tested known good ...

Hello Board was liquid damaged U6201 area and can not boot. Cleaned board and replaced U6201 now boot and load OS. But now headphone only working when machine boot headphone connected. If you disconnect headphone jack after boot headphone cant detect so only internal speaker works. Note: If...

I m working Mid 2012 retina 15" 820-3332-A with random freeze problem when using who application need more GPU power. ASD report GPU problem but you know apple no more replacing boards. Replaced 2 times GPU with new one but now when loading OS freezing and EFI ASD not report error:( ( Chines...

Hello Everyboady Working on 820-2914 with no backlight problem. Some one worked on this board before us and connected PBUS_S0_LCDBKLT_EN_DIV to direct ground so when machine turn on direct start LCD backlight and when sleep computer LCD backlight not turning off. ( but machine working...

Hello everybody; Working on this machine come service with fan noise and %400 kernel task use problem. ASD OS not shows error, ASD EFI shows Th1H sensor is reading above the high limit Checked and replaced, Q5501,Q5503,U5550 nothing change. Where can i check next step? Note: not liquid sign...

Hi, When installing OS stop with "check for hardware error " tried several OS version ,different install disks , and know good harddisk but same problem. I can boot with installed OS but this time crash OS when updating or any app installing ASD report is; SATA: SATA PCI Register Test (test...

Hi , no drop no liquid sign. When checking current sensing circuit R7122 was 300K measured and replaced with 10ohm but nothing change. (R7121,R7151,R7152 ok) PPBUS_G3H = 12.5V and stable PPVIN_S5_HS_COMPUTING = 12.5V and stable PPVRTC_G3H = 3.43V and stable PP5V_S5 = 5V and stable PP3V3_S5 =...

Hello I m working on 820-3787-a board. Its came service for topcase replacemen and workingt but now not turning on. Fan spins then stop loop. When checked voltages PP5V_S4 enable signal turning on and off, its come from SMC but i cant be sure why SMC defect suddenly. My brain burned any idea...

Hello Everybody This machine came from no picture problem at display (chime ok) . Someone reflowed or reball GPU. Its looking like generic GPU problem so replaced chip (216-0810005) now LCD backlight is ok but no picture. (LCD back round is black like new macbook s boot screen ) replaced 4...

Hello everybody I m working on liquid damaged 820-3332 , board is turning on, chime, usb mouse light is ok but no picture LCD. When checked voltage and heat GPU is cold and no GPU voltages, measured U8900 voltages and no GPUVCORE_EN. Its come from U9100 reballed and replaced also U9100 but...

Hello everybody I m working on can not detect SSD problem macbook air 13" . Not see liquid damage sign, tested known good two different SSD, cleaned connector with degreaser solution , SSD little warming. PP3V3_S0SW_SSD is ok Replaced U3710 , U3711 , U3740 nothing changed Any idea for next...

Hello Every body I m working on graphic issue like pictured (I dont know how can i describe it:) , i know it not cause from GPU because ASD pass and not freezing or like that. Tested know good complete LCD and cable with cover Replaced LVDS connector Replaced GPUMUX (U9600) Preheat GPU...

Hello Everybody I m working on liquid damaged 820-2936-B SMC area around, cleaned by ultrasonic now fan spin and turn off loop. Stable voltages : PPBUS_G3H 12.5V PP3V3_S5 3.3V PPVRTC_G3H 3.3V But PM_SLP_S4_L up 3v and down 0 Already replaced SMC and looked bad parts nothing changed, any...

Hello Everybody Working on liquid damaged 820-3476-a . After cleaned SMC area and u1900 around power on but now slow working and fan works high. ASD errors like this, Sensor Group (test #5) - Limit with Core Load Test Verifies a group of sensors defined in SensorGroupLimits.prm. The test will...

Hello Everybody Working on A1278 820-3115 with slow charging problem ( System says 10 hours for charging time). SMBUS_BATT_SDA is surging 3.4v to 3.1 v , SMBUS_BATT_SCL is surging 3.4v to 3.3. tested known good battery and magsafe board. Disconnected BIL CONNECTOR Replaced...

Hello Everybody Working on 820-3662 backlight problem. no liquid damage .. PPBUS_SW_BLK 0V PPBUS_SW_LCDBKLT_PWR 12.5V LCDBKLT_EN_L 12.5V PPBUS_S0_LCDBKLT to ground resistance is 5.4 Mega ohm BKLT_EN_R 3.3V Also replaced , J8300,Q7706,L7710,D7701,Q7701,U7701,U7750 Tested known good LCD, I...