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820-01041-A NO POWER

2click

2click

Member
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
 
2click

2click

Member
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...
 
2click

2click

Member
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?
 
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2click

2click

Member
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 reflowed U1200, now I´m getting 20v @650mAmps. no image on screen... do you think that is a step forward?
 

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2click

2click

Member
Don´t have a donor board for that model, anything that can be done? U1200 is heating up to 50ºC power button now turns on and off the fans, but brain dead... anything else I can do? I enter DFU again and restored it, still getting 650mAmps and no image... what do you think happened? It was the PCH all the way ?? Did I killed it? I didn´t inject any voltage or anytthing...
 
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