Hello guys,
first of all I'm not a professional in repairing electronics, but I do have formal electrical background. From time to time I have managed to repair something like PSU or laptops when faults were obvious or very easy to find with a multimeter.
However, recently I had a problem with 19V power rail shorted to ground. I was not able to find the cause, because a shorted component was somewhere deeper in the motherboard and this was handed to a professional.
I wonder if it is sufficient to check 8th pin on BIOS chip and pin on power switch, where 3.3V is expected and to test it against the ground to conclude that short is not on 3.3V rail?
Since 3.3V is produced from the main 19V, it is reasonable to assume that short on 3.3V can appear like short of 19V rail.
Thank you.
first of all I'm not a professional in repairing electronics, but I do have formal electrical background. From time to time I have managed to repair something like PSU or laptops when faults were obvious or very easy to find with a multimeter.
However, recently I had a problem with 19V power rail shorted to ground. I was not able to find the cause, because a shorted component was somewhere deeper in the motherboard and this was handed to a professional.
I wonder if it is sufficient to check 8th pin on BIOS chip and pin on power switch, where 3.3V is expected and to test it against the ground to conclude that short is not on 3.3V rail?
Since 3.3V is produced from the main 19V, it is reasonable to assume that short on 3.3V can appear like short of 19V rail.
Thank you.
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