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820-3662-a backlight but probably no picture (?)

estelanim416

estelanim416

Member
Hi,
Thank you for the quick reply!
I tried that bios as it supposed to arrive quicker than the programmer. At least some progress :)
I've dumped the BIOS - I hope I have done it right - chose first model after running autodetect. File is too large for me to upload here but here is the google drive link to it
https://drive.google.com/open?id=0B8-MfTNhrDhZbFZsbmY2MnRGMXM

I would love to learn to program them right myself - checked a few videos already. Do you have a recommendation on learning material?
 
estelanim416

estelanim416

Member
Hi,

Thank you for the bios.
I've programmed the chip, poped it on and it booted straight away.
Issue is it wont do that again. I shut it down and its back to square one :/
the chip is on the board - checked the legs and pads.
No chime now :/
 
estelanim416

estelanim416

Member
ok. when i unplug the battery and let it like that for a couple of minutes then it boots again, only once thou. But i can alwatys repeat it and it starts up. ASD is showing some new errors: Detected Trackpad Error (trackpad works), ERROR 8000000E when testing SensorGroupLimits.prm. Biggest issue i guess that when asd tried testing Sleep?wake it went black - fans spinning and nothing - had to disconnect the battery after 20 min
:( I know next to nothing about the board repair - my guess is that some static builds up and wont drain until I disconnect the battery - when i disconnect the battery and touch the bios legs with a metal tool I can plug the battery back in and it boots without waiting
 
Alan.L

Alan.L

Member
Could it be a faulty trackpad? I've fixed a macbook air that only enter safemode. The faulty trackpad's cursor is working fine. But its keep entering safemode and making system super slow to boot. so i swapped the trackpad then did a pram reset and everything working afterward. Yes without pramreset, the system still entering safemode.

I then put the faulty trackpad into other macbook for testing and its causing entering safemode again and pramreset was require.
 
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D

dukefawks

Administrator
Yes BIOS has clean ME. I doubt the trackpad would cause this, but disconnect it. Fans will run high and machine will be slow but it should work.
 
estelanim416

estelanim416

Member
I did disconnect the trackpad - chime, white screen , no logo, but i think its because it was off for long. when trying again i got no chime black screen.
I will go through the whole board again maybe I missed something
 
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