Can a hot PSU cause problems to the monitor?
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Can a hot PSU cause problems to the monitor?
I have a 400w PSU (skyhawk), and trying with differents setups to reduce the noise. The problem is... with this PSU the monitor starts to create interferences or something.. is like waves or 'turbulences' along the screen... more visible with bright colors and appears only when the CPU is doing some task (more W required from PSU i think)... and only when the PSU is running with more temperature... but i'm not sure
I measured the temp from the 2 PSU heatsinks in full load.
1- 47ºC
2- 43ºC
Is this temp too high??
This is with a Papst 8412NGL @ 7v ,too little airflow I know, but the PSU its modified with a BIG heatsinks.
Any ideas please? I have spent much money and time modding this PSU, this problem drives me mad
PD: the monitor is not connected to the PSU.
CRT monitor
CornerStone 21''
I tried with 3 different PSU's in the same setup .. no problem.
Its the first time that i see a problem in a monitor due to a PSU change
I tried with different resolutions and refresh times... nothing changes... well yes, if i down the refresh time the interferences are more visible...
damn..
So you dont have the problem with different power supplies? Sounds like you found the source of the problem. Ive never heard of a problem like that before, maybe someone else has experience with power supplies causing monitor problems? I guess you could just replace the power supply with a different one, problem solved.
ahhh... thats really incredible
The cause is the temperature...
When one of the PSU heatsinks reaches 40ºC more or less ... interferences start to appear alonng the screen. The more temp more interferences.
I plug the Papst fan at 12v ... and just when temp down to 38-39 interferences dissapear... turn off papst, temp rise 40ºC interferences again....
PSUs when are hot creates more ripple or something like that??
I'm shocked
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Since you spent time and money modding the PSU to make it very quiet. You could take measures to reduce the heat inside your PSU so that it stays below 40oC where you don't seem to have any problems.
If it has bottom vents sucking hot air from the CPU you could seal it. Also you could try dividing your case so the top compartment is completely sealed with a piece of wood or foam so that no extra heat is entered. Let the PSU cool itself.
Anyway this is the first I have heard such a problem with a PSU heat causing interference.
Seems like you have to do more work to avoid the interference. You could turn up the fan, but that's probably much worse.
If it has bottom vents sucking hot air from the CPU you could seal it. Also you could try dividing your case so the top compartment is completely sealed with a piece of wood or foam so that no extra heat is entered. Let the PSU cool itself.
Anyway this is the first I have heard such a problem with a PSU heat causing interference.
Seems like you have to do more work to avoid the interference. You could turn up the fan, but that's probably much worse.
Hi all. It's me, TerryW. Long time....
My thoughts on your predicament.
I have heard that in rare occasions that elevated temperatures could cause extreme ripple (AC voltages) on the DC lines. The +5VDC is highly suspicious, as the +5 feeds all the digital control circuits such as the CPU, RAM, video, etc.
It is conceivable the ripple may pass through the R/G/B video lines and/or the horizontal & vertical sync lines.
I also concur with MikeC's notations. Could be EMI - is the PSU cover off? Also, if you plug into seperate outlets, the EMI/RFI can also travel down the AC powerlines. This can be avoided with the use of a good powerline filter on your computer. Do not plug your monitor into the same outlet connection as your computer box.
Gekkani - as you are in Spain, what is the ambient temperature outside your computer case? If say around +30 Celsius then you may need more fans to cool the PSU to a tolerable level.
More food for thought. Good luck.
TerryW
My thoughts on your predicament.
I have heard that in rare occasions that elevated temperatures could cause extreme ripple (AC voltages) on the DC lines. The +5VDC is highly suspicious, as the +5 feeds all the digital control circuits such as the CPU, RAM, video, etc.
It is conceivable the ripple may pass through the R/G/B video lines and/or the horizontal & vertical sync lines.
I also concur with MikeC's notations. Could be EMI - is the PSU cover off? Also, if you plug into seperate outlets, the EMI/RFI can also travel down the AC powerlines. This can be avoided with the use of a good powerline filter on your computer. Do not plug your monitor into the same outlet connection as your computer box.
Gekkani - as you are in Spain, what is the ambient temperature outside your computer case? If say around +30 Celsius then you may need more fans to cool the PSU to a tolerable level.
More food for thought. Good luck.
TerryW