820-00840 no image

tlough75

Member
The other day I got in an 820-00840 that shows 20V .5A on the USB-C dongle but has no image. I can see the backlight is on but nothing on screen. No signs of liquid damage. When I plug in the charge I do get an audible tone like when plugging in an iPad. Trying to decide if this is an image problem or a no booting problem.
 

2informaticos

Administrator
Staff member
Confirm if has USB activity.
Also check external video.

Should be good to test known good compatible LCD assembly too...
 

tlough75

Member
So I took the logic board completely out and put the machine back together and it turns on and is running. Not sure what the hell I did but it is working. Weirdest thing.
 

tlough75

Member
Spoke too soon. While the board seems ok the screen looks great, when I close the display just enough for the screen to turn off and reopen it, the screen goes blank but can see backlight is on. I have to restart the machine to get the image to show up but it comes back every time. Seems like a worn out display cable to me.
 
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