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Thanks for the clarification duke!! At the moment my board is missing 5v_s3 and this line is not shorted to ground. My Meter on diode mode with red probe on gnd and red probe on 5v_s3 gives me 0.430 I tried to see to see if the computer would turn on by injecting 5v into this line. When I did...

I have managed to remove the short by removing u4800 but now when I connect the charger to the computer, the short on 5v_s3 appears again and then disappears. Please note that I haven't replaced this chip. Is this chip important? From what I can see it's usb peripheral controller chip . Thanks...

Thanks duke!! I have re-checked 5V_S3 and its shorted to ground. I tried injecting some voltage (no more than 3v) into this line but it's hard to determine the faulty component since it only consumes 0.18A at 3.0v. I noticed that is getting a little bit warm u4800. Should I add more voltage? Any...

I got a water damage 820-3115 that doesn't boot up. It has a green light on the charger (PPBUS_G3H 12.57v , PPDCIN_G3H 17.08v, PP3V42_G3H 3.46v) and 3.42v on SMC_ONOFF_L pads. After doing some visual inspection I noticed that that the FireWire port power switch circuitry is f*cked. Its missing...

No Title Problem fixed!! I found the short on 5v_s3

Did I measure the resistance to ground correctly?

If I switch my meter to beep test and put my red probe on 5v_s3 and my black probe on a screw hole it gives me 2.2ohms. It also beeps. Is this what you mean? From what I can see, 5v_s3 gets initiated from u7201. I have taken some measurements on this chip and it looks like it's missing en1...

No Title If I switch my meter to beep test and put my red probe on 5v_s3 and my black probe on a screw hole it gives me 2.2ohms. It also beeps. Is this what you mean? From what I can see, 5v_s3 gets initiated from u7201. I have taken some measurements on this chip and it looks like it's missing...

Hello, I have a MacAir 2011 A1370 BRD: 820-3024-B that doesn't turn on. It doesn't have any history of water damage. Every time I connect the magsafe (60W) to the computer it flashes green and orange very rapidly. I have taken some measurements and from what I can see the computer fails to...