Re: Anyone familiar with Dark Knight?

Basiq 430, it was inexpensive. I don't say cheap because I got it retail rather than online as there was a time requirement. It wasn't the cheapest unit but wasn't the most expensive in the class either.

Re: Anyone familiar with Dark Knight?

Ya know, I got other pc power guts strewn all over, plus I'm working on a Dell USFF machine. This is just what I need to fiddle with. Does anyone make a decent kit for replacing the guts of one of these things? Here's some shots; on the pic with the obvious bad caps, there is a coil colored black. The problem area isn't very visible but its just at the base of the part. Anyhoo, you're right, I can salvage the 'sinks and the fans, the other stuff looks no good so I need something to stuff into there....BTW, check out the top notch soldering,...

Re: Anyone familiar with Dark Knight?



Yup, that's the culprit. So I should just toss it into the trash,huh?...

I just pulled a smoking Dark Knight Titanium (550W) power supply. It has 5 very bad caps which I think I could replace. However, looking at it closely, one of the circular copper-covered coils is heavily burnt at the point where it is soldered to the pcb. After pulling the pcb off the damage is local to the coil where the copper goes to the pcb, that area is definitely burnt but looks mostly superficial. Looking at the soldering quality from the underside is really scary. It looks like whoever did it had a giant squirt-gun of solder and just laid it on there. And then there's a jumper wire that...

Re: VX-922 PSU non cap part failures

Decided to update this thread so we could have some sort of conclusion. I ended up paying $25 dollars for a complete PS board which fits in correctly. I thought about doing what JPaytoncfd proposed as the connectors are basically the same. Wiring up a connector line wouldn't have been too difficult, just need to find the female pin blocks and a set of wires to bring them together. The problem is that I would have to hack up the rest of the case in order to make it all fit together and it wouldn't have worked well as the rear cover would have...

Re: VX-922 PSU non cap part failures

well, it turns out that Viewsonic doesn't supply the older PSU board version any more so I'm screwed. So, I'm back to square one and am going to try to revive the old PSU.

I'm going to get Nichicon caps to replace those generic blue caps and to replace the single tiny CapXcon 10microfarad 50v cap in the center of the board. It's the only one on the PSU I haven't touched so it's worth a try. Do any of the other disc caps ever blow?

Rtech, I'm going to change that brown disc cap too, you're right, it looks awfully...

Re: VX-922 PSU non cap part failures



Hmm, ok, well then I'll assume that the wire link I can just leave alone (I'll clean off the powder). I wonder if it's possible that it might be too heavily oxidized inside the insulation.

The large smoothing cap you refer to must be the one in the center (off the top of my head, I think that was something like a 1000 microfarad, 400v) which I did replace. But should I bother to even find a replacement input transformer? The one there is really nasty looking, for sure but I tried to find it online briefly and couldn't...

Re: VX-922 PSU non cap part failures

Ok, great, does anyone know what kind of bridge rectifier I need to replace it with? Can't read anything on the original, and it's awfully long and thin. And it's got just 2 legs so it looks more like some kind of diode?
As for the caps, they're not RS but are miscellaneous spares I abused just to see if the thing would fire up. I left the case open while testing and it was just for literally 1-2 minutes max each time. You think that they would cause the power cycling to that extent? Not much in the way of "flickering", it's...

Viewsonic VX-922 psu failure :

Replaced a slew of CapXon caps on a vx922 display psu (all radial electrolytics) (P/N 3BS006431CGP REV:1 FSP035-1PI01), and on logic board (3 large radial electrolytics).

Unit now powers up but :
a) the blinking green power on light still shows
b) the video returns correctly and one can see correct VGA images (ie: MS Windows splash and boot screens) but when the power on light blinks , the image flashes and takes a few seconds to refresh and then flashes again, then power cycles, flashes, power cycles, etc. etc.
...

Re: How hot does it get in there?

Has anyone ever bothered to mount a small 12vdc cpu style fan in a chassis? where would you even put the power connections? I suppose it's easier for most people to just use a desktop fan and point it at the back of the monitor.