820-00850 no image, no touchbar image

george-a

Member
Hi guys,

nice to be here again, need to update myself to latest development and there is no other place for that.

I have a 820-00850 that switches to 20V only when the battery is connected. It will then draw 0.8-0.9A (possibly fully charged batt) and will give PPVCC_S0_CPU 1V. The fans spin and I get mouse light but no image internally, externally (if I disconnect the lvds) and no touchbar image.

F9000 is at 12.59V.
Board is clean from liquids. Customer said one day was working next day not.

Any pointers?
 

george-a

Member
I managed to flash it using Catalina, macbook pro 13" 2014 and RECOVERY mode.. works only on external maybe internal gpu is toast.
 

2informaticos

Administrator
Staff member
So machine works good with external monitor?
On internal LCD, no image, or get image without backlight?
Did you try known good compatible LCD assembly?
 

george-a

Member
there is no image I believe but I think you cant really verify this on these LCDs with a flash light right? BKLT voltage at 55V. And unfortunately no spare LCD as these are hard to get by even damaged ones.
 

2informaticos

Administrator
Staff member
"BKLT voltage at 55V"
Open line to LEDs strip; possibly flex issue.
Check first if machine is still covered by Apple change screen program.

2016/17 LCD assembly can be used for test.
 
Top