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no, i wrote everything on the 1st post.

yes cpu getting little warm. you reckon U7210 has killed the CPU? the resistance between PPBUS and PPVCC_S0_CPU: 1.0 M ohms

change when the MacBook tell you to. so don't bother changing unless it says "replace now"," replace soon" and "not charging"

I assume you checked the fuse for the screen right, also how did you remove the screen flex cable? you suppose to slide the cable out or slide in. do not use the latch as this will damage the connector. use a torch and shine a light to the screen to see if you get an image. if doesn't work then...

try this: look a the screen cable, there is a conductive foam and there are exposed pins on the connector of the logic board, cover with Kapton tape.

unplug the internal screen then check picture with an external screen

the laptop was liquid damaged but I can't find any liquid on the board. The board was still working then customer changed the screen because liquid got into the screen then a few days later the touch bar has stopped working then the customer reboot the laptop and has stopped powering on. fan...

R7050 = 0.5 ohms. - good isl has good contact between r7051/r7052/r7050

pin2 of R7051 did not connect to R7050. fixed with a jumper. pins 17/18 of ISL now is 3.3 ohms U7000 pin15 = 4.2v" i haven't replace the ISL yet. so the SMC from the donor has gone bad because the ISL has killed it?? Would I need to replace both together?

yeah i am aware, 17/18 should around 3ohms. i'll check properly once i have time. very likely the ISL is bad. i've already replaced SMC when Duke asked me to.

i guess he didn't press "disconnect battery" button before disconnecting the trackpad flex, used a tweezer and shorted PPBUS_G3H_TPAD or other power rails. check USB data line to see if is shorted, and try a new trackpad. The power button is working because it doesn't really require a trackpad...

u7000 - pin15 = 3.368v i assume you mean C7022 pin1 = 16.53 PP3v42_g3h = 3.404v resistance between 17/18 of U7000 = 7.60 ohms resistance between 27/28 of U7000 = 20.5 ohms

i did swap the battery, old battery was liquid damaged. charging, running off the battery, reading battery status in osx is good. R5429 = 300k, good R5439 = 45.4k, good can it be ISL?

can someone confirm if that works? i have a full unit here gathering dust. i guess these wires bypass backlight circuit since thats one of the main functions of the GPU.

thanks 2informaticos, you lead me to PP3v3_S5 power supply.

board is fixed. C7518 was missing. previous repairman didn't put that back in :mad:

no power on ALL_SYS_PWRGD nor on PP1v8S3. ALL_SYS_PWRGD show nothing on o-scope.

thank you Duke, it is working:)

Try another airport card or isight airport cable. These are common failures on Macbook pro from 2008-2010. these cable are too thick, when one wire break it will short the uninsulated ground wires.

someone on other forum says don't believe ASD OSX. it has many bugs etc and has false failures. can a bad ME region causes this? i really want to get this board fixed, its an i7 as well. the board works well on Windows 10, just not OSX nor safe mode.