only red light brief flash (periodcally) without battery, with battery white light 4 sec
+5VALW and 3VALW turns off
no shorts found
any ideas?
+5VALW and 3VALW turns off
no shorts found
any ideas?
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Re: Nm-a981
Review the DCin mosfets.
Measure the voltages on each of the points in the attached.
ACDRV should be ~25 volts to enable the DCin mosfets.Attached Files -
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Re: Nm-a981
20v
26v
20vComment
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Re: Nm-a981
"No shorts found" is a little less in my opinion. What's the resistance to GND of +5VALW, +3VALW, 1.8VALW and +1.0VALW to start withComment
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Re: Nm-a981
The light flash is the feature of many lenovo's-so dont indicate anything.Comment
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Re: Nm-a981
+5VALW >20k
+3VALW >10k
+1.8VALW > 40k
+1.0VALW 53ohm
notice that EC_ON goes on and offComment
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Re: Nm-a981
Does 1.8VALW and 1.0V ALW comes up too, or only 3VALW and 5VALW?Comment
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Re: Nm-a981
Well, then go ahead, and check the coils/power rails which were not mentioned before, the same way. so we maybe get a idea where it is Stuck.Comment
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Re: Nm-a981
found nothing of interestComment
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