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[solved]820-3115 no video, backlight is working
- Thread starter spakhnyuk
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JorgePayar
Member
Louis wrote this in 2013 
"Image, no backlight = motherboard
no image, no backlight = screen
no image, backlight = cable
This isn't exact, but most of the time.
Unplug the video cable, and plug it back in. Keep the battery unplugged, of course."
I would check the cable first, for that you have to remove the screen. Or try plugin it to another motherboard if you can.
Hope that helps
"Image, no backlight = motherboard
no image, no backlight = screen
no image, backlight = cable
This isn't exact, but most of the time.
Unplug the video cable, and plug it back in. Keep the battery unplugged, of course."
I would check the cable first, for that you have to remove the screen. Or try plugin it to another motherboard if you can.
Hope that helps
Last edited:
Holy crap,where did you find that? I remember typing that.. I have no idea where.
How did this come to you? Drop, liquid damage, out of the blue?
First thing is to try known good screen/cable. because this is a board repair forum, I am going to make the assumption that you have already done that, and not suggest it(but if you haven't, I'm going to kick your ass).
Second thing to check is 3.3v on pin 2/3 of LCD connector. Not 1v, not 1.5v, not 2.7v, but a full 3.3v.
Third thing to check is that the little clock filter on the LVDS line is good. My favorite way to check if it is good is to just replace it since it takes less time to do that than to drive myself nuts.. but this machine is too "new" for that to go bad.
How did this come to you? Drop, liquid damage, out of the blue?
First thing is to try known good screen/cable. because this is a board repair forum, I am going to make the assumption that you have already done that, and not suggest it(but if you haven't, I'm going to kick your ass).
Second thing to check is 3.3v on pin 2/3 of LCD connector. Not 1v, not 1.5v, not 2.7v, but a full 3.3v.
Third thing to check is that the little clock filter on the LVDS line is good. My favorite way to check if it is good is to just replace it since it takes less time to do that than to drive myself nuts.. but this machine is too "new" for that to go bad.
What do you get using displayport to vga adapter?
Q9707 wouldn't allow backlight through without vcore. I am guessing it chimes.
spakhnyuk
New member
There wasn't any corrosion around the LVDS connector. I can replace it anyway just be sure. It's just odd that I'm getting a black screen with the backlight working as opposed to the white screen that I should be getting. Plugged it into another display and it does the same thing. Display is confirmed to be good.
PPVCORE_S0_AXG is what voltage? Also, displayport to vga, do you see anything?
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