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2936 that does not detect webcam, already tried 2 different display assemblies. Where should i start?

Fixed, it was U7770. Thanks again guys

Pin 1 has 3.2v but pin 3 has pretty much zero v

No voltage is present on L7770. I checked and you are right, there is no audio also. I tried to test for a short to ground and did not detect one, To me it matched up with a known good board but i have never tested for a short to ground before so I'm not positive i did it right.

No power on pin 16, 0v

R4533 and 36 check out but U4510 pin 6 is 0v

Yes actually it does spin up

Hello, I have a late 2011 820-2936-A that will not detect any internal hard drive, It can boot from a usb and then work fine except it will not see the internal hard drive. I have tried 5 different cables and hard drives with no luck. Where should i start?

I feel dumb but a PRAM reset brought backlight back. Thanks guys!

Have 820-3300-B with image but no backlight Has no sings of liquid damage, already tried known good lcd Only strange thing I have found is that pins 38, 39, and 40 have 25v when on a known good board they have 33v

Yes it does beep when ram is removed. I do hear the HD spin up not sure if that matters. When i plug usb mouse in it lights for a fraction of a second during the plugin process and then goes off Sorry no history on this computer. I got this in a bulk lot

I get 1.11v

I am new here but have a 820-2850-A that has green light and fan spin but that is it. No chime, No video. Where should I start? There is no liquid damage. also wanted to note that a usb mouse does not light up when plugged in