прямо
Badcaps Veteran
Last Activity: 04-13-2025, 12:57 AM
Joined: 09-06-2022
Location: Jakarta
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Don't need to be sarcastic. Just tell me that I'm wrong, I can accept. I'm an adult, not a 5 year old kid.... -
That's the protection mode kicking in, because 10.8V for 12V rails is an under voltage condition....Leave a comment:
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Also worth to check the 5VSB feed back as well just to make sure nothing is wrong with it. Next to its output caps there should be a TL431 and a voltage divider resistor network that set its 2.5V reference voltage, which then get feed back to the TNY chip through an optocoupler.
If one of that voltage divider resistor network fails (very rarely happens), or if the TL431 itself fails, or the optocoupler fails (happens quite often), then the TNY chip will not be able to regulate 5VSB to the correct 5V voltage.Leave a comment:
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Replace the 5VSB output caps....Leave a comment:
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That is normal. 120V AC / 0.707 = 169V DC.
It will be boosted by the PFC controller chip when the PSU is starting such as when you jumper PS_ON to ground.
If the boosting doesn't happen, check the supply voltage of the PFC controller chip. I don't know what chip it is, but the usual voltage is around 15V DC. Also, when you check this voltage, because the PFC controller chip is located at the primary side, the black lead of your multimeter should be at the negative pin of the bridge rectifier.
Be very careful though when poking around the high voltage side....Last edited by прямо; 04-09-2025, 07:06 AM.Leave a comment:
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You will need a scope to trace the HDMI signals on the monitor controller PCB (where the VGA and HDMI ports are located) to see if any of them is missing when the no signal symptom is happening.
Also, does it also happen with VGA input?Last edited by прямо; 04-08-2025, 06:07 AM.Leave a comment:
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Sounds like the issue is with the graphics card if the monitor goes out with a no signal error message.
Have you tried the monitor with other computer or a game console?...Leave a comment:
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It's most likely 1N4148W.Leave a comment:
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Just so people don't keep sending me a chat message about disabling the USB over current auto shutdown.
The ZIP contain the modded BIOS CAP files for PRO and PLUS, latest version 4622. They have been verified to work by user [USER="276031"]Fernon[/USER]
Fernon...Leave a comment:
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If you are doing a recap, you might as well replace them all. Those caps that are measured ok for now, will be bad in the near future and then you will have to open up the PSU again.Leave a comment:
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twist3r[USER="228049"]twist3r[/USER], why not look at the datasheet?
[ATTACH=JSON]{"data-align":"none","data-size":"medium","data-tempid":"temp_378094_1742812695528_857"}[/ATTACH]...Leave a comment:
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You can buy it from LCSC. I trust them better than Aliexpress.
[url]https://www.lcsc.com/product-detail/USB-Converters_Microchip-Tech-USB3343-CP_C633347.html[/url]https://You can buy it from LCSC. I ...347.html[/url]Leave a comment:
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Nevermind. Circuit doesn't work at all regardless of what I do.
I set the output voltage at 12V, and connected a 12V fan as a load. Voltage immediately tanked to 2.3V
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Help me understand this linear supply circuit.
Was looking for a simple CV CC linear supply to build and came across this one.
[url]https://oshwlab.com/svalentin544/lab-power-supply-0-38v-0-5a[/url]
I etched the provided board design and populated it.
The output voltage adjustment works.
The output current adjustment however, doesn't behave like I expected it to be. If PR2 is going clockwise, the output voltage decrease. Adjusting R5 has no effect.
I don't have a load connected to the output at all.
Can someone explain how the current adjustment... -
Doesn't make any sense, unless you don't know how to measure current with the multimeter.
...Leave a comment:
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CM03AX is a MOSFET, from the same manufacturer for the PFC+PWM chip.
Your 150W bench test load is probably too low for the PSU, hence the problem doesn't occur.
Increase the load.Leave a comment:
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Here's an ATX power supply schematic that shows the pinout of the 2003 PWM controller + supervisor combo IC....
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Diodes can be measured as ok with DMM but in reality they maybe not. I just repaired an ATX PSU a few days ago that had a Zener diode failure. It failed to clamp the dropped high DC voltage and gave me a random low voltage below the minimum voltage to start the PFC+PWM IC, but the diode itself is measured ok with DMM. Still is in fact. 0.7V voltage drop and OL the other way around. But it simply doesn't work. After I replaced it with a new Zener diode from my stash, the PSU is working again.
To stop the fuse from keep blowing up, use a dim bulb in series with the mains.
...Last edited by прямо; 01-31-2025, 05:27 AM.Leave a comment:
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+5USB is most likely the USB ports 5V supply.
I don't think it is the same as the 5.5V standby voltage.
I also don't see any board at the bottom right in the picture you provided. Or did you mean bottom left?Leave a comment:
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