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820-3115 - Not turning on / Fan goes to full speed
- Thread starter mushr00m
- Start date
"PP5V_S3 = 0V
PP5V_S0 = 5.05"
That is not possible!
S0 voltage derives from S3.
Unless you have a broken trace to the point where you've checked 5V_S3.
Any history available?
Do you get CPU core voltage?
Tested in SMC bypass mode?
PP5V_S0 = 5.05"
That is not possible!
S0 voltage derives from S3.
Unless you have a broken trace to the point where you've checked 5V_S3.
Any history available?
Do you get CPU core voltage?
Tested in SMC bypass mode?
I don’t have a detailed history of this machine — it arrived a long time ago, and I remember working on it briefly before setting it aside. Unfortunately, I don’t recall exactly what was done.
At some point, I replaced the U7200, but it might have come from a donor board and could potentially be faulty — I’m not sure.
Just to clarify, PP5V_S3 is reading 5V as expected. (My mistake somehow yesterday)
Regarding the CPU core voltage, I’m not sure which specific line you’re referring to.
I haven’t tested the SMC bypass mode yet.
Any suggestions on the next steps?
At some point, I replaced the U7200, but it might have come from a donor board and could potentially be faulty — I’m not sure.
Just to clarify, PP5V_S3 is reading 5V as expected. (My mistake somehow yesterday)
Regarding the CPU core voltage, I’m not sure which specific line you’re referring to.
I haven’t tested the SMC bypass mode yet.
Any suggestions on the next steps?