Recent content by datatech85

I tried to recognized the MacBook in DFU mode. It is not. Is there something else I can do ? Thanks in advance

I checked all LDOs: LDO0_IN (PP1V1_SLPS2R) = 1,10V LDO1_IN (PP3V3_G3H) = 3,22V LDO2_IN (PP1V8_SLPS2R) = 1,79V LDO_CORE = 1,49V LDO0 (PP0V8_SLPS2R) = 0,79V LDO1 (PP3V_G3H) = 3V LDO2 (PP1V2_AWAKE) = 1,19V LDO3 (PMU_LDO3_OUT) = 1,79V LDO_RTC = 1,48V Are the values normal?

Hello ! I hope to find some help with this case. I've got a Macbook Air A2179 (820-01958) that got an electric shock. First mesurement show 5V / 0.016A. The first observation was the capacitor C78B7 with burn marks near U7800. There was a short cut on "PP3V3_G3H_PMU_VDDMAIN". I replaced the...

I removed UR730 and the short on PPBUS_AON dissapear. The MacBook is working right now. Thanks a lot !! :)

Do UR730 could be the culprit ? It seems it warm up to the thermal camera.

C5250 take 12.30V I also checked the line (from C5250 to C5257), all take 12V

Hi, I checked all the big coil. No one gives same reading as PPBUS_AON. Only L5840, L5820 and L5800 gives the same resistance that i already checked on PP3V8_AON but it's not surprising so far. Any suggest on components to check ?

Yes, battery and charger were disconnected. I've got 30,1ohm between PPBUS_AON and PP3V8_AON.

Thanks for your answer. I checked in diode mode PPBUS_AON and PP3V8_AON power rail. It seems that both rails are shorted (or at least low resistance). I've got 26,7Ω on PPBUS_AON and 29,5Ω on PP3V8_AON. Regarding the history, we don't have any informations on the operations carried out by...

Hello, We received a Macbook pro A2485 which has a power issue. Battery doesn’t take charge and all the USB C ports are stucked at 5V / 0.018A. We can’t get 20V. The Macbook has already been to a repair company and we note that the UG400 chip has been unsoldered. Here are the operations we...

I've replaced the U7410 chip and everything is working properly now... Thanks a lot for your help!

It's done, I removed U7410 and I have a resistance value between coils L7420/7410 and PPBUS_G3H that increases progressively until infinity! What's more, I no longer have a short-circuit between PPBUS_G3H and the ground :D Would you advise me to put in a new chip, re-solder the fuses...

I get 0 ohm between these 2 coils : L7410 & L7420 and PPBUS_G3H. Does it mean there is fried component between PPBUS_G3H and CPUGT ?

Thanks for your quick reply! I've used a thermal camera to detect a component that's heating up, but I can't find anything that's heating up. I have big coil near the CPU that gets the same reading to ground (L7420 and L7410) L9080 seems good as the resistance value starts at 1 mega Ohm and...

Hello, I am working on a Macbook Pro A1990 (motherboard 820-01041) which is not charging. The Macbook consumes 5V and 0.019A at USB-C. I've physically separated (by removing F7000 and F7001) PPBUS_G3H and the ISL9240 charging chip to see which side the short is coming from. Removing these...