Re: Sorting out old PC power supplies?
^ This.
The MOVs are for surge / high-voltage protection on the input. If they are blown, probably the voltage on the input got way higher than it should have been (which BTW can also happen if some fool puts the 115/230V switch on the 115V position and the AC voltage is 230/240V... which it is on your side of the world.)
So just check the fuse, NTC, and bridge rectiifer. If they check out normally (or at least, you will probably need to replace the fuse, as I suspect that will be blown), the PSU should be able to turn On.
That's about all I can say here. Pictures of the individual PSUs would help if this still doesn't get them going.
-
Re: Sorting out old PC power supplies?
i suspect it was 150v, although that may be too low for a 240v input.
maybe that's why it blew up.
total rectified voltage is going to be about 340v so divided by 2 it's 170v
so using parts rated between 200 and 250v is probably wise
btw, the psu will run without them - so if it's dead it probably blew the fuse or killed an input filterLeave a comment:
-
-
Re: Sorting out old PC power supplies?
lol
Metal Oxide Varister.
a surge suppressor device.
was there a pair of these in parallel with the 2 smoothing caps?Leave a comment:
-
-
Sorting out old PC power supplies?
I have just been trying to sort out a couple of oldish PC power supplies that had stopped working. I found lots of domed caps and replaced them all. Still not got them working yest but I did notice a burn mark around one of the AC inputs to the PCB. There were 2 small capacitors near the burn mark as well and I removed them to check. They were both covered in some sort of black heat proof plastic. When I removed the plastic from one of them the blue colored cap inside fell into 2 parts (see photos attached). So I think this might be one of the problems. I cannot tell what these caps are but they look like ceramics and when I measure them the good ones show a value of around 160pf. I cant understand the markings on the caps so can someone tell what type these are and the value so I can order some.
thanks
JonAttached Files -
-
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.
Assuming... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
Hi,
Back after a long hiatus with some old power supplies that need repairing. I've recently picked up a couple of 386SX systems, two 486DX systems, a SiliconGraphics Indy and an iMac G3 that either have verified leaking capacitors in their power supplies, or are likely to in the near future. For the sake of simplicity, instead of tackling all at once, I'm starting with the 386's and one of the 486's.
The 386's power supplies are Seasonic SS4040A's, with caps that are visibly leaking, and 9 replacement caps per unit are required. Most appear to be from the Rubycon... -
This specification for the HP Pavilion Power Pavilion Power 15-cb009nl Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Pavilion Power 15-cb009nl boardview and Pavilion Power 15-cb009nl schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties that...09-06-2024, 05:59 AM
-
I have a Dell E5470 that powers up and boots windows no problem. Using a non-standard universal type charger, it shuts down immediately if moved, (power short in that charger or AC power jack) because the battery has no charge and isn't charging orange/white lights blinking on the front. When first powered up, BIOS power alarm stated that it could not detect the voltage setting and I had to dis-able the message to get past this. It got into Windows fine, as long as not moved, so I dis-assembled it looking for a cold solder joint on the power jack that I thought might be lifting off the MB, but...
Leave a comment: