820-3023 - 3 beeps / Freezes with Graphical glitches / Power cycling

[Alan.L]

your board likely to have bad a PCH or CPU.

replacing the modules...just find that has same code.

read my thread.
https://www.rossmanngroup.com/board...20-3208-a-intermittent-3-beeps-liquid-damaged

 

[smiba]

Yeah I was thinking about the PCH/CPU, but if there are random I/O screw ups the patterns woudn't stay the same.

If video memory gets corrupted in the transfer I'd assume more glitchy-ness but the patterns are always these blocky kind of glitches. Also the video is still and not moving around with random patterns (As more common with I/O disruptions)

Also I've managed to make the issue worse by pointing my hot air at the memory ICs which could show the issue is with one of the chips.
Since the system detects this as "two memory banks", would it be possible to remove one half and see if that does something?

Obviously it says nothing if the CPU is still screwing up the memory, but memtest is able to find issues just in a couple of seconds


EDIT: Started memtest another time and it failed on exactly the same second, percentage in the same region of memory.
Is there a way of finding out what module is part of this region?

 

[Alan.L]

thats a actually good idea, i never thought of removing one of the memory banks permanently.... i'll try on my faulty board. hope this is possible
memtest is passed on my board tho.

 

[smiba]

Let me know how that works for you!

If memtest passes even after hours your memory is most likely OK though and the PCH is most definitely to blame. But if the board is trashed anyways, it can be a neat experiment

 

[Alan.L]

damn, doesnt work. now full beep all the time. do i need to remove something else

 

[smiba]

Did you remove Channel A or Channel B?

I'm not even sure if it supports running with one bank though, maybe apple's programming does not allow this. I think the CPU on its own should be able to POST with only one bank though...

 

[Alan.L]

channel A, right side. i think thats were the liquid got under them.

 

[dukefawks]

My input is that if you want to change all RAM chips then it will probably work. In my eyes this board is therefor junk.

 

[smiba]

Alright, I'll put it all the way down on the list in case I have time for it.
Just gotta put on some good music and time will fly

 

[dukefawks]

I have a bunch of these boards all working fine. If you are interested send DM.

 

[Alan.L]

Alan.L You sure you removed the right modules? Maybe Bank B contains the messed up part?[/QUOTE]

not 100% sure,,.. but OMG i dont want to change 16 rams. 8 is already enough.

i'am waiting for the DDR3-2 stencil to arrive.