Never heard of 'em. Let's see the guts.

I'll take some pictures later. Had a quick look yesterday. I saw a couple of large Panasonic caps in there, but couldn't identify the others.

Panasonic primary caps is a good start.

Right. Took some pictures of the guts of the thing. I'm unable to identify anything other than the who large Panasonics.
https://drive.google.com/open?id=1-8KtWI7tFTQ … f2x3LrZ9Ah-kLk3
I hope that link works properly.

I also had a quick look inside the Liteon PSU, and noticed it seemed to be mostly made up of Nippon Chemi-Con caps. I need to measure the voltages at the motherboard plugs though, cause if the lead colours are anything to go by, they've rearranged it compared to standard AT. But if I can swap them around and turn it into a standard AT pinout, it might be a very solid PSU. But I think 146W may be a bit on the low side for my new Pentium 233mmx build though, which is why I'm leaning towards the Zeck model at 200W.

Lead colors don't necessarily mean anything. I have several different Delta supplies that were recovered from various OEM machines. (I bought them on Ebay, so I don't know where exactly they came from.) On one pair of AT supplies I have, the +12V rail is blue instead of yellow, which of course changes the -12V rail color in the AT connector. The PG signal was different as well. Gray, I think, instead of orange.

One easy way (when you already have it open anyway) is to check where the leads are soldered to. Many supplies have the rails marked on the PCB, so you can see exactly which is which.

I have four PCs running on 145W PSUs... two 386s, a 486, and a Pentium 166. My Pentium II is on a 200W supply, as is my Pentum III. Don't worry about it unless you've proven it to be a problem. Usually, PCs take much less power than people think they do. A good rough guess can be made by taking the printed specs on all your drives and subtracting that wattage from the PSU's marked maximum output. Find the TDP of your CPU and (if applicable) GPU and subtract those as well. Figure maybe 10-20W for other add-in cards and the chipset and RAM. Those are all maximum values, as often is the PSU's rating, so you don't really need to pad anything. If you haven't blown the wattage budget, you're fine. Remember, you're not often running the CPU and GPU and all your drives at full tilt all at the same time.

LunarG wrote:

Right. Took some pictures of the guts of the thing. I'm unable to identify anything other than the who large Panasonics.

Those 470uF primary caps are well enough for 200W total power. There is minimal EMI input filtering. There is a bridge rectifier, probably 4- 6 Amp one. Primary switching seems to be done by 2SC4130 BJTs in this half bridge arrangement. 2SC2625 or MJE13007 might be a better option depending how much the circuit is optimized. Main transformer seems to be 35 size with center tap for secondary common ground. Enough even for 250W total output. That current sensing coil glued to the pcb with the wire going through it looks a bit kludgey but only aesthetically.
HA17339 does the primary pwm. TL494 comparator is practically the secondary housekeping and power ok generator chip. On the pictures only a to-247 package output diode is visible. This is the 5V rail rectifier. Probably a 30-40 Amp Schottky. 12V might be done by a 10- 12Amp double diode. Only the TO-220 diode casing is visable.
Those GPE caps on the secondary output filter look wierd without a top vent, but probalby have one on the bottom. The unit could use a fan controller circuit, but only if the fan is loud. This PSU can easily power even a beefy Pentium build.

Finally found some time (and energy) to pop the lid on the Liteon PSU and take some snaps of the innards.
Would be nice if this is a standard AT PSU, because from the looks of things, the components are top notch. Even a nice Panasonic fan. I would imagine this wasn't the cheapest PSU when it was made.
So, Dave86, what can you make of these pics?

https://drive.google.com/open?id=1-MQW8EkwQRm … 4kfiSrT2_CnxGDI

FWIW, if it were mine, I would use it. Decent quality caps, and they're probably still OK, but I would replace them (and the fan) just for good measure. Good clearance between the primary and secondary sides, despite the somewhat unconventional layout. (AC in at the top left corner, circling around the board to the DC output at the bottom left corner.) Looks like they spared no expense on the line filtering and protection circuitry. My only concern is, I don't see a mains fuse. Could just be missing it, though.

There is a fuse, but it was in a spot that was difficult to photograph. I wouldn't want to have to change it... Very hard to reach.

LunarG wrote:

Would be nice if this is a standard AT PSU, because from the looks of things, the components are top notch. Even a nice Panasonic fan. I would imagine this wasn't the cheapest PSU when it was made.

Yeah this Lite-on unit is fairly overbuilt and the components are high quality. That UC3844 drives a FET and unlike the Zeck with its two BJT in half bridge this one can slighty be more efficient even (3- 4% more).
The only thing that holds back the max output is the configuration of the protection circuit. Very serious and precise. This is a 150W max combined output psu.
Correct me if I'm wrong but I think these were made for Compaq 486 machines.

To be honest it's higher quality than any AT PSU currently in use in my AT systems.. Even the shittiest AT PSUs, I tend to clean and use.. They are hard to come by these days.

DAVE86 wrote:

Yeah this Lite-on unit is fairly overbuilt and the components are high quality. That UC3844 drives a FET and unlike the Zeck wit […]
Show full quote

LunarG wrote:

Would be nice if this is a standard AT PSU, because from the looks of things, the components are top notch. Even a nice Panasonic fan. I would imagine this wasn't the cheapest PSU when it was made.

Yeah this Lite-on unit is fairly overbuilt and the components are high quality. That UC3844 drives a FET and unlike the Zeck with its two BJT in half bridge this one can slighty be more efficient even (3- 4% more).
The only thing that holds back the max output is the configuration of the protection circuit. Very serious and precise. This is a 150W max combined output psu.
Correct me if I'm wrong but I think these were made for Compaq 486 machines.

According to Google, it is indeed a Compaq power supply, yes. With the colour coding on the wires being non-standard, and Compaq being a brand known for sometimes using weird pinouts (at least with ATX style connectors), I don't want to just plug it in and hope for the best. I'd like to make doubly, nay triply, sure before connecting it to a motherboard.

LunarG wrote:

DAVE86 wrote:

Yeah this Lite-on unit is fairly overbuilt and the components are high quality. That UC3844 drives a FET and unlike the Zeck wit […]
Show full quote

LunarG wrote:

Would be nice if this is a standard AT PSU, because from the looks of things, the components are top notch. Even a nice Panasonic fan. I would imagine this wasn't the cheapest PSU when it was made.

Yeah this Lite-on unit is fairly overbuilt and the components are high quality. That UC3844 drives a FET and unlike the Zeck with its two BJT in half bridge this one can slighty be more efficient even (3- 4% more).
The only thing that holds back the max output is the configuration of the protection circuit. Very serious and precise. This is a 150W max combined output psu.
Correct me if I'm wrong but I think these were made for Compaq 486 machines.

According to Google, it is indeed a Compaq power supply, yes. With the colour coding on the wires being non-standard, and Compaq being a brand known for sometimes using weird pinouts (at least with ATX style connectors), I don't want to just plug it in and hope for the best. I'd like to make doubly, nay triply, sure before connecting it to a motherboard.

You can use it on any AT system no problem. Voltage rail pinout is standard.
ATX is more strict on "violating" cable color coding still there are some exeptions on some OEM builds...

appiah4 wrote:

To be honest it's higher quality than any AT PSU currently in use in my AT systems.. Even the shittiest AT PSUs, I tend to clean and use.. They are hard to come by these days.

Indeed they are. Startech recently stopped producing their AT PSU so I grabbed a couple for backup. There’s still an Athena (or something like that) branded unit being made but they look pretty rubbishy.

I didn't get a good look at the DC output section from the photos, but I did see one rail marked on the PCB as +12V (IIRC, it was orange rather than yellow), which means they're probably all labeled. The P8/P9 connectors look like they're probably right to me, but I can't say for sure that the -12V and -5V aren't swapped, or that the POK isn't inverted or somehow different.

Basically, if you can find the designations on the PCB for +/-5V and +/-12V, track those colors to the AT connectors, and compare that with a normal AT pinout, you'll be good to go. The POK will most likely be standard as well, and if it isn't, it's almost certainly just inverted -- which means the board won't power up, but otherwise will be safe and sound.

LunarG wrote:

Right. Took some pictures of the guts of the thing. I'm unable to identify anything other than the who large Panasonics. https:/ […]
Show full quote

Right. Took some pictures of the guts of the thing. I'm unable to identify anything other than the who large Panasonics.
https://drive.google.com/open?id=1-8KtWI7tFTQ … f2x3LrZ9Ah-kLk3
I hope that link works properly.

I also had a quick look inside the Liteon PSU, and noticed it seemed to be mostly made up of Nippon Chemi-Con caps. I need to measure the voltages at the motherboard plugs though, cause if the lead colours are anything to go by, they've rearranged it compared to standard AT. But if I can swap them around and turn it into a standard AT pinout, it might be a very solid PSU. But I think 146W may be a bit on the low side for my new Pentium 233mmx build though, which is why I'm leaning towards the Zeck model at 200W.

my Packard Bell OEM Liteon uses Nippon Chemicon caps, i have been using it in my Pentium 133 430VX build.