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I have a 820-2877 board with all S3 power rails missing. The S5 ones are fine. P PDDR_S3_REG is 0.3V, all the other S3 rails are 0V. On Q7260, pin 5 is 12.60V, all other pins are 0. On Q7910, pin 3 is 3.322V, pin 4 is 3.344, all the others are 0. On U7200, pin 21 is 0V.

Let's say I have a board with some problem on a certain state Six ( G3h, S5, S3, or S0). Some of the power lines are ok, some have a voltage close to the value expected, but still out or range ( for example 30%-40% below the expected value) , some have a voltage in the mV range, some are 0V...

I have some 820-2877-B boards to repair and a 820-2361-A DC in jack. Are the compatible? The connectors are physically compatible, but on eBay if zI search for A1342 (820-2877-B) dcin jacks, I get 820-2627-A. Is that the only one I can use on these boards?

I have a board with all of the G3H powerails present, but on of the S5 rails present. I have the following measures from U7200: Vin (pin 16) =12.61V; Vref(pin 3)= 0V; Vfb2(pin 5) = 285mV; Vreg3 ( pin 8)= 260 mV; Vreg5 (pin 17)= 17mV; Veno(pin 13)= 14mV. Is this indication of a bad U7200? How...

I have a mackbook A1278 820-2327-A and I 820-2530-A loose board which needs repairing. My question is: Can I use the magsafe dc-jack from the 820-2327-A macbook with the 820-2530-A board? Are they compatible? How about the peripherals? Both boards are for A1278 macbooks. Does it mean the...