Re: XFX RX 580 8GB GTR Black Edition 8gb OC+ - no display
Isn't 0.6ohm on the GPU too low? It's basically the resistance of the probes. I thought that only the newest GPUs have 0 ohm resistance.
Beton
Member
Last Activity: 04-12-2022, 03:00 AM
Joined: 12-07-2021
Location: Budapest
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Re: Asus p5g41t-m lx motherboard no post
Well, you have to check the voltages generated by the mb to see that all of them are present. If yes then try to flash the bios chip somehow.
Here is the boardview file....Leave a comment:
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Re: Finding a dead short component
Wouldn't applying such high amperage destroy the traces? I know these VGAs in question might be already totally dead but in case I run into something else with similar problem.
Btw it just occured to me that the testing probes were hot when I injected voltage, I mean I could feel it but nothing serious... but not the VGA.
My psu on paper is capable of 30V/10A.Leave a comment:
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Re: Finding a dead short component
I tried with 1V, I know it has to be equal or lower than the rail voltage itself. But it doesn't matter because the short protection lowers the voltage on the psu.
I tried the alcohol method, ipa is isopropyl alcohol.
Btw a 0.1 ohm resistor was the hottest (barely noticable hot) by my observation with ipa but the resistor is fine.
I haven't tried the flux atomizer yet.
I'm asking this because as I said a 0 ohm dead short not gonna get hot, that's the whole point....Leave a comment:
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Finding a dead short component
Hi guys!
I searched for the term "dead short" in the forum but no specific thread came up however if I'm just blind and couldn't see the thread talking about this please forward me to that direction.
So my problem is I don't know how to find the source of a dead shorted voltage rail. Dead short = ~0 ohm resistance.
I have two VGAs (HD 4850 and HD 4870), both dead shorted to ground on the memory rail. I have the boardview file for the 4870 and the memory rail consists around ~7892346 capacitors...
I have a bench PSU and if I try to inject voltage the voltage...Last edited by Beton; 12-10-2021, 01:10 PM. -
Re: Dead Rx480
May I ask what kind of pre-heater you bought? I can't find any for $10.
If you can't use a link here then a search word for aliexpress would be good.
Thanks.Leave a comment:
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Re: Interchangeable BIOS chip?
Thanks. These two MBs are fairly old (<2009) and they use BIOS and not UEFI. UEFItools doesn't show the descriptor region where the VSCC table would be.
Later on updating the BIOS can be an issue yes although in my mind this is like replacing a a 1MB disk with a 2MB disk consisting the same 1MB program. I might try it later.
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Interchangeable BIOS chip?
Hi guys!
This might be a stupid question but nevertheless I would like to know the answer.
Recently I bought a bunch of spare or repair motherboards.
One of them misses the BIOS chip. The chip is the [B]MX25L4005A[/B]. Every voltage rails are fine on the motherboard but obviously it won't post without the BIOS. And even with the BIOS chip it's not guaranteed to boot up, somebody removed the ic for a reason.
So I have another one motherboard which has a somewhat similar BIOS chip, the [B]MX25L8005[/B]. The [B]only [/B]difference is that the former is a 4mbit while the latter...Last edited by Beton; 12-09-2021, 09:43 AM. -
Re: Biostar BT-250 got heated as soon as plugged in
I've encountered this exact problem with exactly this ic (1117) on a few different boards, this LDO converts 5VSB to 3VSB on all of them. I attached the schematic for this board....Leave a comment:
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Re: New Members - please post your introductions here
Hi guys!
Repairing things is a new hobby to me and I'm hoping to get better with the help of this forum.Leave a comment:
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