Well then, April 2021 calling
Pretty great thread here. Thanks to everyone here already having added to the knowledge.
I was justed gifted a non-functioning ASRock Rack C2750D4I rev. v1.02 (including 32GB of RAM!) which wouldn't run anymore (since 2018). The owner added that the possible cullprit would/could be "CPU Heat Problems". That was the last thing he saw somewhere in some logs.
I had a look. The board was indeed unresponsive. BMC Heartbed LED was beating, though.
Found something I hadn't heard of: IPMI. That was also working.
IPMI showed a log of CPU Temperature problems <somethingsomething>"unrecoverable"... and those were the last entries in that log (dated 2018)
The IPMI interface also couldn't connect to the board.
I updated the IPMI firmware to 0.30.0, for good measure; this did clear the history log.
The story was "yaddayadda I had to reboot, but then it wouldn't come up anymore".
So, in retrospect, that sounds like he had this degraded clock-circuitry thing going.
I read that the ASRock C2750D4I (and possibly the whole line of C2000) had not 1, but 2 possible bugs, (or perhaps even 3 if CPU overheating is also a thing).
I read here (and elsewhere) people mentioning other boards with their manuals, and having a succesfully fixed their clock/problem. (and some who weren't succesful) This did gave me enough courage to have a go at it.
So from the last forum pages here (6,5, and 4), and the Youtube from EVVblog, my guess guess was to find the 'same' header/port/placeholder on this board.
The ASRock C2750D4I manual:
ASRock Rack > C2750D4I
On pages 6,7,8,9 you have the layout and a index/glossary/table for the onboard locations.
Nr 18 is the TPM Header.
Page 21 has a layout of the pins.
On this board, the TPM is actually populated with headerpins but a smaller formfactor than all other pins. Standard dupont female cables didn't hold at al. I had a go and soldered an 110 Ohm resistor to the pins (1 and 9). It was pretty non-invasive and non-destructive. can also be removed if needed.
But, alas, this did not help; Board is still unresponsive, IPMI still works.
I have no Osciloscope so can't check if there even is any clock pulse on it.
Currently even my multimeter is misplaced.
Also, my electronics knowledge is near-zero. ("pull-up resistor", wha..?)
I do have a photo (from my phone) of my little fix.
this did not fix my problem
- Was my interpretation of where I should do this wrong?
- Have I botched the 'fix'?
- Do I have the Flash-overwrite problem?
- Is my CPU indeed fried?
- How do I check all of these?
- If the CPU is fried, I'm giving up.(it's surface-mounted right?)
- But what people mentioned about the flash chip (was that this thread or another? It was an SMD chip available at Mouser) I would actually, dare to have a go at replacing that one. (it seems doable with a steady hand)
- If I need to retry with the Clock fix, perhaps I misinterpreted the location on the board, I would retry that too.
- Any help or pointers what to check, I would probably have a go at that too.
- I don't think I can find someone with an Osciloscope here.
Well, cheerio, and I hope for the best