[SOLVED]820 3437 B, No backlight

Noguinfor

New member
Hey guys,

I dont have backlight in this board. No liquid damage.

D7701 - pin 1 = 7.07 pin 2 = 20.1V

Fuse ok !!

any idea ?
 

Noguinfor

New member
when i try to PRAM reset a padlock appears... i can enter in ios.. have to some way to know the password inside ios?
 

smiba

New member
Ask the customer for the EFI Lock password or if the login in OS X allows you to select "Other user" you might be able to try to login with the "root" user trick (User root, password empty. Try this two times), the device might not have updated yet :)
 

smiba

New member
Try to login onto the computer and set the brightness to full, at least that way we know for sure it isn't simply turned off.
I recommend just asking the customer for the EFI lock though so we can do a full PRAM reset....
 

Noguinfor

New member
good idea smiba, unfortunately don't work.. i already ask a password to client, i'm waiting.. but clients usually forget the firmware password.. ty for rply
 

Noguinfor

New member
Ok, i already remove a efi password and I already do a PRAM reset.... But don't have BKLT! after diode D7701 - pin 1 = 7.07 pin 2 = unstable 24v - 30V ... suggestions ??
 

dukefawks

Administrator
Replace LP8550. Although 30V should usually give some backlight. Known good LCD? Also check feedback trace to ball A5 on LP8550 of course.
 
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