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So restored the firmware again... it finished doing the installation, the computer showed the folder with question mark and suddenly turned off. Now if I press the power button the fan spins, but there is no image on the screen... U1200 is getting very hot... should I reball that one? update: I...

It did... with the battery I had to keep pressed the power button (then pressed it many times) and it turned on, but it did it 2 times, then it stopped turning on... is ppbus_g3h at 12.6 normal on this model?

I tried it again and was able to restore, but nothing shows on the screen. There is a weird thing... when the restore finishes, instead of having DFU icon it shows a lock... this board is driving me crazy! I don´t get why it lets me access it in DFU but won´t turn on...

Yes.. with the battery connected if power button pressed for a few seconds it turns on but its laggy and show the question mark folder, tried internet recovery but couldn´t complete... without the battery on my bench it just keeps stuck at 20v @40mAmps

All capacitors are good, replaced a couple of them, but no difference... Still not getting PVCCIO_EN and already changed U7800 this is driving me crazy... what voltages are requiered on U7800 for it to create that line?

The corroded area is aroud U3000, u3500.

I didn´t had PVDDQ_EN so I reballed U7800 just in case... the board turned on, I connected it into the case... it showed the apple and question mark folder... now I am trying to turn it on again but it won´t. It´s stuck at 5v @250-450mAmps

The only 2 coils that get some voltage and have correct values are L7030 and L7660 no other coil pulses I even checked with an osciloscope and I get nothing... don´t know what to do...

Please help me understand what´s happening with this board... it is apparently trying to start but when I connect it to the USB C meter it gets to 5v @120-240 mAmps then makes the transition to 20.1v @200mAmps top and drops to 30mAmps. I think there is something wrong when it is at 5v. It...

Ok, i just tried SMC bypass and It just doesnt do anything... its the same behavior goes to 200 mAmps then drops to 30 mAmps...

I checked the reactions when connecting the usb c charger on both rails no pulse or voltage I checked them shorting PMU_ONOFF_L to ground and no pulse or voltage came out of those lines. PMU_ONOFF_L is high at 3.3v I will try to bypass smc, just don´t know how to do it in this models...

ok, thanks anyway!

Tried triggering PMU_ONOFF_L PM_SLP_S3_L = 0 PM_SLP_S4_L = 0 on my usb c voltage meter when I connect the computer i get this 5v transition to 20v with a .200 Amp consumption for 2 seconds then drops to 30 miliamps...

sorry: PP1V05_S0SW is not present on the PMU I get all PMU voltages but that one and I´m not sure but it seems to be created in U7800 is that right?

I dont get voltages on big coils exept for: L7030 and L7660 PP1V05_S0SW is not present on the PMU I get all the voltages but that one and I´m not sure but it seems to be created in U7800 is that right?

So for sure that is working, because it worked with the other board... is the EDP_BKLT_EN a signal or an enable voltage?

I don´t have the working board anymore so I can´t compare the voltages Is there a way to make a jumper to the enable of U8401 ?

LCD is good, I connected another working logic board to it and it worked fine... EDP_PANEL_PWR drops at the same time that the lcd voltages

I was able to access it in DFU mode, the firmware was restored correctly, but never saw image on the screen, then tried to connect it to a external hdmi screen but it´s not turning on... can you please tell me which voltages are needed on the power sequence in that model? Thank you!

DP_INT_HPD = 0 (pulses to ,600 drops to ,250 then to 0v) diode mode LCD connected pp5v_s0sw_lcd = ,406 pp3v3_s0sw_lcd = ,453 diode mode LCD disconnected pp5v_s0sw_lcd = ,570 pp3v3_s0sw_lcd = ,668 DP_INT_HPD = ,781 EDP_PANEL_PWR = 0 (pulses to 3.3 and drops)