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Search: Posts Made By: dicky96
Forum: Abit - Asus - Aopen 03-06-2020, 12:25 PM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

This motherboard is no more. it's gone to meet it's maker. But do have a nice stash of MosFETs and other useful bits from it :d
Forum: Abit - Asus - Aopen 03-01-2020, 12:14 PM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

VTT comes from a FET that is basically acting as a series voltage regulator. Not a Buck regulator circuit. So there isn't a controller. Nor any ground connected to the FET.

I've checked...
Forum: Abit - Asus - Aopen 02-27-2020, 05:34 AM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

I got a bit further with this but still haven't found where the problem is

I desoldered the north bridge and afterwards I had a direct short on VTT. I used my bench PSU to put 1.2V onto VTT and...
Forum: Abit - Asus - Aopen 02-13-2020, 06:26 AM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

Thanks momaka, piernov - you helped me some more

I tried running the board without the cpu heatsink. It isn't a problem as the CPU only goes up to 45C even after the board has been powered up for...
Forum: Abit - Asus - Aopen 02-12-2020, 09:52 AM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

Actually I was using my 20MHz LG scope but I will look again tomorrow with my 100MHz Tektronix scope.

Vcore and VRAM are OK. I will have a look to see where the CPU reset signal comes from. ...
Forum: Abit - Asus - Aopen 02-11-2020, 05:25 AM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

I've come back to look at this again. Thanks for the board view files - I got them to open in Boardviewer and they helped me.

As far as I can see there is no system clock, I've looked around the...
Forum: Abit - Asus - Aopen 10-03-2019, 03:32 AM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

Sorry to be a pain, I have openboardview but when I open one of those files i just see a large square with a few capacitors (or similar) on it. How do I get the boardview with all the components?
...
Forum: Abit - Asus - Aopen 10-02-2019, 09:45 AM
Replies: 17
Views: 1,372
Posted By dicky96
Re: Asus P5S800-VM no POST

Thank you. That's much appreciated
Forum: Abit - Asus - Aopen 10-02-2019, 06:58 AM
Replies: 17
Views: 1,372
Posted By dicky96
Asus P5S800-VM no POST

Hi guys, here is the latest motherboard I'm trying to fix just for the hell of it

ASUS P5S800-VM

It turns on/off with the ATX power switch, but it doesn't boot (POST 00 on my diagnostic card)
...
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