IDTech monitor IBM

I had IBM looking up #s but the docs listed on the website are not available.

Luck, I found the old broken supply. Things listed at 16 volts 10 amps. Probably uses all 6 pins.

greg

You probably won't find documentation. Just fix the original power supply, any competent tech should be able to.

Post your request to comp.sys.ibm.ps2.hardware; you are likely to get more helpful replies.

Michael

I don't think i would try to fix it. Its the second one that failed. Someone sent me the docs info.

greg

Maybe I will try to fix it. Such a hard deal trying to find another 16 volt supply. I found one for $300. The IBM is on back order @$150.

Delta supply used in IDtech IBM model, now Lenovo, but monitor not available due to Sony.

greg

If you want to make something really cheap here you go..

Just have to recitfy it and build some regulation..

Mike

That looks way too small and cheap to be 10A, I think 1.0A is a lot more likely, looks like a doorbell transformer.

You don't want a linear power supply for that kinda power, it'll be a boat anchor.

Hmm.. Now I go back and look at what it is you're probably right.. I thought that was really cheap for a 10A transformer.

Well here's another thought. Couldn't you just get two 16v 5 amp SMPS for a laptop and wire them in parallel? I've never seen it done, but I can't see why it shouldn't work any different than wiring 2 batteries in parallel.

Mike

greg

Did you check the ESR of all the electrolytic capacitors? That's where I start when diagnosing switchmode power supplies.

Probably doesn't have to be 16V exactly, 14-20V or so would probably be just fine, but I don't think the original supply should be hard to fix. If you don't know how, take it to a tech who does.

A lot of IBM laptops use 16V power supplies.

I didn't check the caps. I'll give it a shot. The supply is on order, but that might be a problem since its not in stock. The logic seems a bit too complex to troubleshoot without a diagram. You would think that the problem is likely a heat overload problem.

greg

I wouldn't. I would think the problem is likely bad capacitors, I see it all the time, probably 80% of SMPS problems.

isn't that the major cause of capacitor failure ?

greg

Yes, bad capacitors are the major cause of capacitor failure.

They fail for a variety of reasons, age, heat, electrical conditions, there was a large batch with defective electrolyte.

Usually when they start to go, they work better as they warm up.

Did you check the electrolytic capacitors? (Sorry if I missed this in a previous reply.)

There are 15 V power supplies on eBay. Some may have enough adjustment range to give you 16 V if that is absolutely needed.

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I got my ESR meter and will check today. The OEM supply has a coaxial looking supply cord. It has a little red wire running through the center bundle for a sense line. I don't see anything like that often.

greg