Weissnix4711
Member
Last Activity: 04-12-2025, 04:45 AM
Joined: 06-10-2023
Location: Shropshire
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ASRock B650I Lightning WiFi boardview
from [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-desktop-motherboards-graphics-cards-and-pc-peripherals/3604219-asrock-b650i-lightning-wifi-no-boot[/url]https://from [url]https://www.badcap...-no-boot[/url]... -
ASRock B650I Lightning WiFi no boot
Hi all,
I'm having some trouble with an ASRock B650 board, any help would be appreciated. Appears to boot at first, turns PSU on, fan spin, but does not post. no display output, beep codes, or anything.
Tracing signals after power button press,
PSIN and PSOUT work as expected,
SIO asserts PSON and the PSU turns on.
RSMRST# jumps to 1.5V then immediately starts decaying over ~200us.
SLP_S3# and SLP_S4_s5# stay high throughout.
Further power good signals:
ATXPGD, PWROK0 and PWROK1 (labelled O_PWROK1, SIO_PWROK and... -
Re: MSI Z690-A Pro DDR4 (MS-7D25
I'm not sure why I was on about ".6V" between the 0V82 rail and gnd, when I meant a resistance of .6 ohms. I guess it was a bit late lol. Also, I can't for the life of me figure out how to edit my posts. Ah well.
I've checked every cap on that net, none look weird to me.
I have some experience with BGA rework, but it's mostly flash chips and whatnot, nothing with quite as many contacts as this chipset. Also yeah, I wouldn't make much of a profit if I had to spend 40-50 USD on a new chipset, let alone taking into...Last edited by Weissnix4711; 06-14-2023, 01:50 AM. Reason: Apparently I can only edit my latest post :/Leave a comment:
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Re: MSI Z690-A Pro DDR4 (MS-7D25
I have found a short. Problem is, it appears to be on the chipset package.
I had initially measured PCH_0P82_VSB to be right around the correct voltage, but I did not until just now notice there's only about .6V between it and ground. Probing around other points in the area, I eventually discovered the lowest resistance to gnd of about .4V across one of the caps right on the chipset package. This is unplugged, with CMOS battery removed.
So either one of the smt components on the chipset package is creating this short, in...Leave a comment:
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Re: MSI Z690-A Pro DDR4 (MS-7D25
Hi,
> 3. PCH assets SLP_S3# - (pin 64 - input on SIO)
Do you mean the PCH pulls SLP_S3# low after PWRBTN# signal is received? Ie. the signal should be high (inactive) when standby power is available but before power button is pressed?
I also just realised I made an error in my original post, SLP_S3# is always low and is never pulled high. This leads me to believe it shouldn't be an issue with the PWRBTN signal as the issue appears to be somewhere earlier in the power sequence.
CPU and ram are good,...Leave a comment:
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Re: MSI Z690-A Pro DDR4 (MS-7D25
Hey, thanks for the reply.
I don't currently have a 1v8 adaptor on hand, so I can't read out the spi flash. However, I have tried probing both DI and clock pins of the spi flash, there is no activity whatsoever. I do also believe this very early initialisation should all be done by the SIO, right?
The board is basically immaculate. No cut traces anywhere I can see, or any corrosion / water damage.
The alcohol trick is an interesting one, thanks for that. I'll try later. For now I can tell you I could not feel...Leave a comment:
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MSI Z690-A Pro DDR4 (MS-7D25
Hi all,
My MSI Z690-A pro DDR4 motherboard is showing no signs of life. SIO is the NCT6687D, for which I have no datasheet. I'm just going off net names from the boardview I have for this mobo and the datasheet of the similar NCT6686D.
All relevant power rails seem good, incl. 5VSB and 3VSB. When PSIN# is pulled low, the PSOUT# signal is pulled low by the SIO. However, the chipset appears to do nothing. SLP_S3# and SLP_S5# always remain low.
The RTC crystal is working, RTCRST# and RSMRST# are high. Any ideas what else may be preventing the chipset from... -
Re: New Members - please post your introductions here
Hi all.
Just a another tinkerer / hacker here. Occasionally does electronics repair work.
Regards,
ThomasLeave a comment:
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