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initially, the board couldn't see the original apple charger but works well with PSU/fake charger. so I changed Q1780 and it still didn't work then I changed ISL and works for a few hours with original apple charger but later on, it stops working. then I changed Q1780 and ISL at the same time in...

going to use the original smc, checked SMC_PM_G2_EN on the chip is 0.700

i would try another U8900. you might have used a bad U8900. this is the mux chip.

Yeah i know. I guess i better not to inject voltage and risk of burning another trace. I’ll have to run a long jumper underneath the SMC.

i've removed u7941 its still low, then i removed smc its still low. board has a internal short? should i inject 3v to SMC_PM_G2_EN, see where get hot?

yes U7941. sry

i found Pin2 of u7841 in diode mode is 0.059 dead smc

u7941 pin1 - 3.45 pin2 - 1v pin3 - 0v pin4 - 3.4v pin5 - GND pin6 - 0v pin7 - 0v pin8 - 0v

ops sorry 3.45v on pp3v42. pins 17/18 and 27/28 = 3.2 ohms and 20 ohms

not liquid damage, no corrosion. there is green light. fan doesn't spin. light doesn't change to orange when i connect to a battery. pp_bus_g3h= 12.59 sys_onewire = 3.431 pp3v42 = 3.45v pp3v3_sus = 0 pp3v3_s5 = 0 SMC_BC_ACOK = 3.4v PPVRTC_G3H = 3.53v PP5V_S5 = 0 PP5V_S3 = 0 smc_reset_L = 3.42v...

i think you definitely have to desolder the bios chip when using TL866 as i do it all the time. there might be another programmer that uses a lead but probably pricey.

see link, you will need a USB stick, go to disk utility and restore this image. link deleted* to do a bios dump, you will need a bios programmer like a TL866.

can you try the Blank Board Serializer ? not sure if this will work on 2015 boards tho but worth a try. if doesn't work then you will need to dump the bios and add the serial manually. also, can you give me a copy of this bios, i always wanted a blank serial 820-4924 dump because they are worth...

Heaven benchmark will crash after a couple of minutes and sometime when I run normal apps will crash. I've already tried reflow and using new solder on U8900. I've tried new RAM as well and using my own external osx drive. Passed ASD OS. Heaven doesn't crash when using Intel HD Graphic only.

you soldered to a wrong test point. replace the chip and run a jumper from FB line to PPHV_S0SW_LCDBKLT. (check if you have continuity before you do this) also, your soldering bob is too big and that looks like a mess you are creating a short. to

mmm one of the pin is suppose to be missing, i guess it's ok to use after bending the pins back.

i tried low melt..there is solder on the other side a swell. lol..brute force didn't work on a donor board, i guess its time to order some from aliexpress...

after try cleaning it more. now its stuck on headphone mode only. say goodbye to this port. what is the best way to remove a headphone port from a donor board without melting the grey plastic?

removing R6330 hasn't worked. it just turns off the optical red light. so the only way is to replace the headphone port?

didn't work. I can still see the red light in the port and digital out is still showing in the setting. i forgot to mention, I can hear chime on the internal speaker and headphone is also working. it changes from digital to headphone when i insert a headphone jack, edit. not L6607 neither...