Hi all,
I'm working on a rabbit-hole again, I have a 820-00165 board that has not been damaged (no liquid or other nasty stains).
It came with the story that it runs but freezes randomly, when we looked at it at first it came to the disk selection and then frozen now it won't display or chime at all. I removed the SSD and wifi and inserted a USB drive, no changes.
So opened it up removed the battery and when powering it on it gets fan spin but no chime and no image, looks brain dead to me...
on visual inspection the board looks mint
I Checked al the common voltage rails (mostly I just probe all coils) and look at the schematic if i see something weird.
In this case they looked fine. also the two vcore phases rails are present (1.2v). I inserted a USB thumb drive and noticed the led on it to go on and off again constantly. the CPU gets a little warm as I would normally expect. Than I took my oscilloscoop and probed the 5v usb rail which was present and stable, I also probed the bios MISO line (slave out) and there seems to be data.
to me it looks to be bootlooping but don't know why, (I checked all 820-00165 Rossmann videos but no clues)
I'm working on a rabbit-hole again, I have a 820-00165 board that has not been damaged (no liquid or other nasty stains).
It came with the story that it runs but freezes randomly, when we looked at it at first it came to the disk selection and then frozen now it won't display or chime at all. I removed the SSD and wifi and inserted a USB drive, no changes.
So opened it up removed the battery and when powering it on it gets fan spin but no chime and no image, looks brain dead to me...
on visual inspection the board looks mint
I Checked al the common voltage rails (mostly I just probe all coils) and look at the schematic if i see something weird.
In this case they looked fine. also the two vcore phases rails are present (1.2v). I inserted a USB thumb drive and noticed the led on it to go on and off again constantly. the CPU gets a little warm as I would normally expect. Than I took my oscilloscoop and probed the 5v usb rail which was present and stable, I also probed the bios MISO line (slave out) and there seems to be data.
to me it looks to be bootlooping but don't know why, (I checked all 820-00165 Rossmann videos but no clues)
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