Hello all,
Yet another macbook I could use your help with. This initially didn't power on. I found U5580 to be corroded, this was replaced along with C5580.SSD current sense circuit. I noticed after some work that R5585 is missing, not sure if because omitting or if I knocked it off during soldering. For the moment I have replaced this resistor but it has not made a change in my symptoms. After resoldering and replacing U5580 and C5580 the computer powered on but after a while it stopped working again. When it DOES power it does pass the hardware test. Applying a bit of heat to the mother board or handling it seems to make it work again. When it does NOT work the always on power rails are on and it seems to be S4 and onward that try to turn on but go back off. When I attempt to turn on I get a bit of a squeak coming from near L7310 and L7320. This noise is present when the computer runs too, its not super loud and I think it's somewhat normal. The intriguing part is when I remove the SSD the squeak goes away but the symptom doesnt. At the same time I have had some occasions where one of the chips on the SSD gets quite hot even though the rest of the computer seems to be off. I'm thinking something is weird with the current sense circuit still even after rework. Tried applying heat but hard to tell which part is the one that makes the difference. Next I plan on dissabling the current sense circuit for the SSD and maybe removing the switch for SSD voltage and see if that changes anything with the symptoms. This computer never fails to show charge/orange light. Your insight would be greatly appreciated!
Yet another macbook I could use your help with. This initially didn't power on. I found U5580 to be corroded, this was replaced along with C5580.SSD current sense circuit. I noticed after some work that R5585 is missing, not sure if because omitting or if I knocked it off during soldering. For the moment I have replaced this resistor but it has not made a change in my symptoms. After resoldering and replacing U5580 and C5580 the computer powered on but after a while it stopped working again. When it DOES power it does pass the hardware test. Applying a bit of heat to the mother board or handling it seems to make it work again. When it does NOT work the always on power rails are on and it seems to be S4 and onward that try to turn on but go back off. When I attempt to turn on I get a bit of a squeak coming from near L7310 and L7320. This noise is present when the computer runs too, its not super loud and I think it's somewhat normal. The intriguing part is when I remove the SSD the squeak goes away but the symptom doesnt. At the same time I have had some occasions where one of the chips on the SSD gets quite hot even though the rest of the computer seems to be off. I'm thinking something is weird with the current sense circuit still even after rework. Tried applying heat but hard to tell which part is the one that makes the difference. Next I plan on dissabling the current sense circuit for the SSD and maybe removing the switch for SSD voltage and see if that changes anything with the symptoms. This computer never fails to show charge/orange light. Your insight would be greatly appreciated!
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