so customer brought in this macbook, doesnt start with normal power button, but can turn on, in smc bypass, took out the logicboard, found that the trace cr5479 and r5479 is gone, so i jumper it, because there are corrosion near smc, I has tried reballing smc, but still only start at smc bypass..
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820-4924 only start in smc bypass
- Thread starter Yoel Ren
- Start date
What is the voltage at C5479?
Check traces continuity for R5477-79.
Also check AVREF_SMC voltage.
Don't forget to check exact resistance between pins 17/18 and 27/28 of U7100.
Check traces continuity for R5477-79.
Also check AVREF_SMC voltage.
Don't forget to check exact resistance between pins 17/18 and 27/28 of U7100.
Check for short at AVREF_SMC.
If yes, C5125 and C5021 are the first suspects.
If no short, change U5110.
If yes, C5125 and C5021 are the first suspects.
If no short, change U5110.
You're welcome!