Computer Power Supply: ST P3NB80FP
My power supply just went dead. Opened it and found a dead transistor marked ST P3NB80FP. I am having a hard time finding it locally, I would like to know what alternative I can use?
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Re: Computer Power Supply: ST P3NB80FP
Is there any chance of posting a photo or two? We might be able to figure out what role it had, and recommend some replacement.Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - Shenanigans -
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Re: Computer Power Supply: ST P3NB80FP
Another 800V, 90W, 2.6A, 4.6 RDSon N-MOSFET, such as something ripped from the high voltage section of a junked PSU, possibly with a part number of the form 2SKxxxx or Kxxxx? How about old junked Antec SmartPower or SolutionSeries PSUs?Comment
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Re: Computer Power Supply: ST P3NB80FP
the on resistance of that fet is total junk,
a lower on-resistance is better because it will generate less heat.Comment
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Re: Computer Power Supply: ST P3NB80FP
From information given, I am having a hard time determining what brand and model power supply this is, and how many watts it is supposed to be. The 800 volt rating on the transistor makes me think it is not the 5vsb switching transistor, but the 3 amp rating makes me think it is not the main switching transistor. The only thing for sure is ..... the power supply is dead.Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
Hello!
i got a damaged Manson NTP-5561 (60V, 1,6A DC output) and and the main issue is that the controler IC for the LCD display has a short. The controler IC PIC18F87K90 is mounted on the back of the back of the LCD. Vss-Vdd = 3 Ohm. The 5V and 3,3V power line was killed as well, but that is not a problem. A new LDO 3,3V and 5V 7805 is already ordered.
Replacing the PIC18F87K90 is necessary but that makes no sense without having the HEX dump of the new controler.
Does anybody have such a power supply and could do a HEX dump of the Flash and EEPROM memory?
...04-12-2025, 10:38 AM -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles...
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