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Appletax said:
I am working on an HP Pavilion Gaming Desktop TG01-2003w.

I want to test the power supply, but it doesn't use the standard 20+4 pin mobo connector. I cannot use my PSU tester. It uses a 4 pin connector. Using info from this website, I placed the black probe on the COM port (black wire) and the red probe on the +12v (yellow wire). I did not short the green (ground) and black (COM) cables that are in PWRCMD connector. I thought that shorting the PSU is always required, but it worked - the 4 pin mobo connector and the 4 pin CPU connector were all at +12 volts. Did I do this correctly or do I need to do something different? The PSU part # is L76557-003.

It would be nice to find a resource that has all the various pin layouts for PSUs.

Here's my multimeter and how I have it configured for this testing:

View attachment 17504

The connectors:

View attachment 17501 View attachment 17502 View attachment 17503
Click to expand...
I wouldn't spend any time testing it. If you suspect it in any way remove, bin it and replace. In the time it takes to test it the client could be on their way.
Further, if you do take time testing it and you deem it "ok" and it fails later it's on you.
 
Sadly, you can't prove a power supply is "good". You can only sometimes prove it's bad.....and then only if it's essentially dead. Anecdotally, I have to presume that they are making power supplies more robust these days - I can't remember the last time I had to replace one. We used to keep several models in stock and go through them at a decent clip. The ones we have now have a thick layer of dust on them.
 
... with a proprietary power supply tester of course. You could measure the voltage when it is in use against something known to be 3.3v, 5 v, and `12v.

If in doubt, I would try swapping it with a known good as the test. If you do not have a known good, you can of course RMA or buy another one.
 
HCHTech said:
Sadly, you can't prove a power supply is "good". You can only sometimes prove it's bad.....and then only if it's essentially dead. Anecdotally, I have to presume that they are making power supplies more robust these days - I can't remember the last time I had to replace one. We used to keep several models in stock and go through them at a decent clip. The ones we have now have a thick layer of dust on them.
Click to expand...

Yeah I used to like to keep 3 or 4 in stock all the time but anymore 1 is good and that might sit for months lol. I usually keep 2 standard ones around and when 1 sells I'll get another one lol.
 
NETWizz said:
when it is in use
Click to expand...

This is important. I have used computer power supplies on my workbench for years as a stable power source for tools, instruments and projects. I short the two pins in the 24-pin harness so it starts up every time I flip its switch. Totally no-load when no instruments or tools are plugged in it reads 10.3 volts on the 12 volt rail. As soon as I plug something in (battery charger/discharger, IP camera, etc.) it jumps and holds at 12.1 volts.
 
Sorry but that's a disposable crap box. Not much you can do except replace the case, motherboard, and power supply in order to turn it into a real computer. If you want you can buy a replacement power supply from HP if your client is willing to wait but if it doesn't fix the problem you're stuck with it. Let the client decide whether they want to wait a week or two and take a chance on this crap box, have you build them a decent computer, or have you replace the motherboard, case, and power supply to get rid of the proprietary garbage. Or of course they can go to Best Buy and buy another crap box. It's up to them.

I'm surprised you guys don't replace power supplies more often. Unfortunately OEM desktops don't use standard ATX PSUs anymore so if that's all you're seeing then I can see why you're not stocking or replacing them much anymore. The PSU market itself has caught on to this trend too. It's difficult to find a good quality basic power supply nowadays. Anything with even a minimum level of quality is at least 750w and $80+. I keep a few dozen power supplies in stock in various brands and wattage ratings and we go through them regularly. Then again, we see (and build) a lot of custom builds. I'm also surprised how few custom builds most of you guys seem to see in your shop.
 
"I'm also surprised how few custom builds most of you guys seem to see in your shop."

We quit building white boxes at least 15 years ago, and settled on IBM -> then Lenovo. We are 99% small business and I haven't been asked to build a custom box in at least 10 years... which makes me sad because I enjoy it. I will have to agree that power supplies have actually been pretty solid lately, as I don't remember the last time I replaced one. The only major issue I have had is trying to figure out how to get enough juice when a customer wants a better graphics card in one of the Lenovo PCs. Thankfully that doesn't happen too often.

If you want to be amazed... look at one of the Lenovo P3 Ultras. How they cram so much stuff in such a tiny box, and extract all the heat... it is amazing. I have a 20 or 30 of them out there, and the customers seem to like them.
 
Abramsgunner said:
"I'm also surprised how few custom builds most of you guys seem to see in your shop."

We quit building white boxes at least 15 years ago, and settled on IBM -> then Lenovo.
Click to expand...
Exactly. Why waste time (aka labor) when you can't bill the full amount. It's one thing if you're helping a friend, family member, etc. I always bill out at least one hour for doing the window shopping and putting together the OEM options which they then purchase. Totally different for paying customers.

Now don't get me wrong. There are those who are happy to pay the full labor bill. Usually gamers of flight sim. Those are rare and repeat business from them is scant at best.
 
I have never, even once, been asked to do a custom build. I have been asked to do repairs on some (and not usually repairs, in the real sense, but getting someone out of a "I decided I was going to build my own and now I'm stuck" mess). I've never taken one of those jobs on, and never will.

Custom builds have not made sense for the vast majority of users in any demographic my entire time in this business (since 1980). If ever there were a true niche market, this would be it. The major makers have been producing something to fit virtually any typical, and a number of not really typical, but common enough, needs for as long as I've been in this business.

I've only elected to supply 4 custom builds (that I didn't build) once, and would not have done it then were price not an object for the client based on precisely what he needed, and the mix of configurations needed. They worked and continue working just fine, but it's a nail-biter for me when they're involved.
 
britechguy said:
I have never, even once, been asked to do a custom build. I have been asked to do repairs on some (and not usually repairs, in the real sense, but getting someone out of a "I decided I was going to build my own and now I'm stuck" mess). I've never taken one of those jobs on, and never will.

Custom builds have not made sense for the vast majority of users in any demographic my entire time in this business (since 1980). If ever there were a true niche market, this would be it. The major makers have been producing something to fit virtually any typical, and a number of not really typical, but common enough, needs for as long as I've been in this business.

I've only elected to supply 4 custom builds (that I didn't build) once, and would not have done it then were price not an object for the client based on precisely what he needed, and the mix of configurations needed. They worked and continue working just fine, but it's a nail-biter for me when they're involved.
Click to expand...

What do you keep putting political messages in your signature? This is not the appropriate place for political anything. I don't mean to be a jerk, I just don't want to see political stuff on this forum and I'm sure many others feel the same way. I do not care if the message is pro Trump or anti Trump, I simply do not want to see it. It just spreads anger, hatred, and division. No politics on Technibble, please.

@Bryce W

Edit:

Our world is so full of hate and sickness and I think it's the worst it's ever been in my lifetime. It's soooo bad. Political posts and signatures just add fuel to the fire. I think putting political posts and/or signatures on a computer repair form is immature, no offense.

Either way, though, I sure do appreciate britechguy's insights and help. He's a very good writer, too. I always look forward to seeing what he has to say regarding tech stuff.
 
Last edited:
Appletax said:
What do you keep putting political messages in your signature?
Click to expand...

Because it's my signature. I am not accustomed to having people police signatures, anywhere, including here. My signature lines, and there have been many over my time here, rotate frequently and reflect who I am and what I think as a person. Sometimes they're political, but most often they're not. So far as I can tell, they do not violate TechNibble rules. If I am told differently by "the powers that be" then I will modify my practice. Until then, they're going to be a part of the rotating collection that I use here.
 
fincoder said:
I would have thought that signature is a statement of fact, possibly politics adjacent but not partisan.
Click to expand...

Here we go. People just can’t help themselves.

You are only allowed to think this about Trump if you also think this about Joe Biden.

Thinking otherwise would make you a total hypocrite with double standards and that would be very sick and disturbing. I sure hope you were also out there bashing Biden when he was destroying everything.

Shall we continue? I think Bryce should just delete this entire thread and ban ALL political ANYTHING.

We live in a very sick world full of hate. I am ready for Armageddon.
 
fincoder said:
Bryce's sig was just stating a fact.
Click to expand...

You mean "Brian's," and no one could possibly argue that Ms. Jurecic's statement is not factual, and even more factual now than when it was written.

I find it repugnant that anyone thinks it's appropriate to police signatures that are not obscene, derogatory, or defamatory. If it can be said in a newspaper (and it was) it's certainly "fit to print" elsewhere. I'm not going to be cowed because anyone happens to be offended by my choice of signature lines. Never have, never will.

And I notice that the "powers that be" have been noticeably silent on this matter even after being directly tagged. That silence speaks volumes.
 
britechguy said:
I am not accustomed to having people police signatures, anywhere, including here.
Click to expand...
Unless it's truly inappropriate/offensive (like something sexual or promoting violence or racism or whatever) I don't think signatures should be policed or have to be related to the theme/topic of the forum. If someone wants to have something about football in their signature on a tech forum, I don't see a problem with that. I'm not a fan of politics or sports but some people are really into those things. My signature has absolutely nothing to do with computers or technology and it probably never will.

The only other thing that should be enforced with signatures is size because some people go crazy with putting a bunch of text/images in their signatures and you've got 2+ pages of content tacked onto each of these user's replies which is super annoying and resource intensive. I remember back in the early 2000's I was part of a forum where members competed in forum games and won awards, and they could put each award into their signature. Some members signatures go so big that the admins set a rule that they had to choose their favorite 10 awards to post in their signatures. I remember one guy had like 137 awards and you had to scroll at least 7 times to get past them every time he posted. The scroll wheel on my mouse got a workout every time I opened a thread he had posted in.
 
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