Hello
I have Rtx 2080 and the problem is explained below.

Gpu boots up and works perfectly on load without any issue. But when i turn off my computer and turn on again after short time it do not gives display.

When i turn on pc after 8 to 10 hours it gives display and works again perfectly.

Its passing Mats and not giving errors on any memory bank.

Please tell me what could be the problem with my gpu.

Bad bios chip maybe?

I also suspect bios chip. Is there any way to check it before replacement?

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Posted after 2 hours 35 minutes 49 seconds:
I checked with multimeter while no display it gives 3.2v on 5v inductor.

So now you know where to look. Check 5v convertor and everything around it for possible problem.

3.2v on 5v rail and short on pex.

Are you sure that you are measuring everything correctly? What is pex resistance?

You don't have to replace the vBIOS chip. You can hook it to a CH341A and a test clip to read the contents and compare them to some vBIOS image on the internet. But first I recommend you to check if everything is being powered with the correct voltage. Perhaps you have a bad chip.

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Posted after 1 hour 11 minutes 34 seconds:
I searched around the internet and found a BIOS file. I'll attach it. If you are gonna flash it, please backup the content on the chip, it is very important if my file doesn't work.