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MacBook is starting but I get a grey screen ( looking at the back, apple logo i have a backlight) but no image I have done a lot of measurements This is what I find very strange U9270: pins 5 & 6. = 1.08v voltage at the same time (lcd plugged in) U9270 replaced but no difference U9600) is...

When I start the MacBook it show the Apple logo than the bootbar for 75%, then I get a blank screen. After that the system turned off and repeat the same again. Or is this due the graphic BGA. Any suggestion where to start ?

This is the outcome of my tests busy for day's ( pHfff) PM_DSW_PWRGD, PCH_DSWVRMEN, PM_BATLOW_L, SMC_ADAPTER_EN and PCH's RTC signalsv = Ok. ALL_SYS_PWRGD=0V PLT_RESET_L=0V PM_PCH_SYS_PWROK=0V CPU_VCCST_PWRGD = 1.05V CPU_VR_READY = 1.08V PP5V_S4RS3=5V SMC_ONOFF_L 3,43v PM_PWRBTN_L 3,42v...

Does anyone know where to download teh ASD S3156 and te latest testfiles for Apple. It can be paid or free version is welcome. I have to test MacBook Air from mid-2013, which have a high fan spin

Hi I am new to this forum. I am from the Netherlands, and a very newbee in repairing on motherboard level. This is my problem I have three beeps on startup and no screen. I have already reflow the memory modules, without success Is there a way to find out which memory module is may be faulty...