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Search: Posts Made By: PeteS in CA
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 12:41 PM
Replies: 5
Views: 51
Posted By PeteS in CA
Re: Help identifying power ic?

Either img tags are not working, or vBulletin is not recognizing the imgur page as an image, https://imgur.com/a/2oQ3LXE .

I can't see clearly any IC such as berthfield described, but there is an...
Forum: General Capacitor Questions & Issues 02-20-2019, 11:44 AM
Replies: 3
Views: 790
Posted By PeteS in CA
Forum: General Capacitor Questions & Issues 02-20-2019, 11:43 AM
Replies: 3
Views: 1,013
Posted By PeteS in CA
Re: Problem with LG LW40 Express

The OP is from 2010.
Forum: Troubleshooting Power Supplies and Power Supply Design 02-11-2019, 02:02 PM
Replies: 4
Views: 143
Posted By PeteS in CA
Re: Delta DPS-360FB A from Dell Studio XPS 435MT

Looks like that PSU is about 10 1/2 years old. Very decent life, though it'd probably still be OK had Nichicon PWs or HEs (or UCC LXZ or KYs) used instead of the Ltecs.

Companies like Dell and HP...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-11-2019, 01:36 PM
Replies: 2
Views: 124
Posted By PeteS in CA
Re: Delta dps-300sb doesn,t start no output no led

In the 5VSB circuit? Or in the PWM circuit?
Forum: Troubleshooting Power Supplies and Power Supply Design 02-06-2019, 01:15 PM
Replies: 1,554
Views: 307,291
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

That "Duro" might be good for 200W: wimpy input bridge rectifiers; 330uF input lytics; lightweight heatsinks; small main output transformer; small output inductor. Somewhere around 200W-250W it would...
Forum: General Capacitor Questions & Issues 02-04-2019, 03:26 PM
Replies: 2
Views: 150
Posted By PeteS in CA
Re: Chemi-Con caught price fixing

Rubycon and others: https://www.justice.gov/opa/pr/three-companies-agree-plead-guilty-fixing-prices-electrolytic-capacitors

Also Nichicon:...
Forum: General Capacitor Questions & Issues 02-04-2019, 03:23 PM
Replies: 25
Views: 530
Posted By PeteS in CA
Re: Overvolting/reversing a polymer cap

Pretty sure it was hundreds of hours if not over a thousand. Not bad for 2000 hour (at max ripple and temp) parts. It was ~10 years and two jobs ago, so hazy memories.
Forum: Troubleshooting Power Supplies and Power Supply Design 02-01-2019, 04:53 PM
Replies: 3,000
Views: 727,259
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Well, the most recent date code I spotted in the pix was "9752", on the PCB. So this was built in early 1998. This is consistent with the .7A 5VSB rating.

I do remember a Delta PSU that was in...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-01-2019, 04:29 PM
Replies: 1,554
Views: 307,291
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

That output inductor is extra crispy! Either it was badly overloaded for a long time or it was run so hot the core lost its magnetic characteristics and self-fried. Or both.

Those input rectifiers...
Forum: General Capacitor Questions & Issues 02-01-2019, 04:17 PM
Replies: 25
Views: 530
Posted By PeteS in CA
Re: Overvolting/reversing a polymer cap

It's been 10 years or so, but I think that when I tortured some polymer caps - 8X or 10X their ripple current rating - they just deteriorated slowly. I probably declared victory when they reached 2X...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-30-2019, 12:56 PM
Replies: 11
Views: 192
Posted By PeteS in CA
Re: Delta ADP-310AF No Power and frequently chirping

Sounds like one of those caps has gone high ESR. It charges enough to let the PWM start, but can't provide enough voltage for the PWM to keep operating.
Forum: Troubleshooting Power Supplies and Power Supply Design 01-24-2019, 03:36 PM
Replies: 3,000
Views: 727,259
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Based on not a lot of info, I think it may be. The input filter looks like it uses safety agency rated capacitors, and I like the heavy metal, the hefty heatsinks. If the main transformer is as hefty...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-23-2019, 04:21 PM
Replies: 3,000
Views: 727,259
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

I'm guessing inrush limiting thermistors.



SGS was an Italian semiconductor company that merged with the French company Thomson CSF in 1987 (several Thomson polyester caps can be seen in your...
Forum: General Capacitor Questions & Issues 01-17-2019, 07:18 PM
Replies: 919
Views: 389,036
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

If diamon got 8 or 10 years of life out of those caps, that isn't too shabby, though the failure mode is visually dramatic. That system does look like it could be made part of a stack in a position...
Forum: General Capacitor Questions & Issues 01-17-2019, 04:20 PM
Replies: 919
Views: 389,036
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

:rock: Heh! We were all typing responses at about the same time. One thing diamon did not mention is the age of the home theater system. If it's 5 or more years old with lots of on time I'd be...
Forum: General Capacitor Questions & Issues 01-17-2019, 04:12 PM
Replies: 919
Views: 389,036
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

Given the condition of those sleeves, I'd be concerned about hot adjacent components and cooling in that part of the unit. It's been almost 10 years, but I have tortured many KZEs, HEs, FMs, and ZLs...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-16-2019, 04:13 PM
Replies: 3,000
Views: 727,259
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Back in 1979 or 1980 I saw a low performance knock-off of an older Boschert model. The performance was inferior, but the quality was better than the Leadman in that other thread. That thing is...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-16-2019, 04:10 PM
Replies: 1,554
Views: 307,291
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

"X" cap C4 is rated for 500V :poof: and a horrible tempco! The "Y" caps are also GP ceramic disc types, :poof: !

The output caps are all rated for 85C, which mean that at best they are high...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-11-2019, 11:55 AM
Replies: 5
Views: 247
Posted By PeteS in CA
Re: Delta DPSN-525AP Power Supply Repair

I'm not familiar with this P/S, but it looks to me like there is a PFC stage, followed by two separate, individually regulated inverters (probably synced). So the fact that the -53 works indicated...
Forum: Troubleshooting Power Supplies and Power Supply Design 01-10-2019, 05:21 PM
Replies: 3,000
Views: 727,259
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

Wow! That almost looks like it was hand built by a hobbyist! I started working with switching power supplies in 1980, and I'll just say that what was produced by Boschert and Astec around that time...
Forum: General Capacitor Questions & Issues 01-09-2019, 11:09 AM
Replies: 919
Views: 389,036
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

The residue looks to me like it is deposited on wires nearest case vents, in a pattern that suggests the residue came from outside of the PSU.

As to color, over the decades I've seen a range of...
Forum: General Capacitor Questions & Issues 01-08-2019, 03:07 PM
Replies: 919
Views: 389,036
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

Actually, that residue looks like dust. Unless a cap vented from the bottom, the residue is also too close to the PCB for the residue to have come from that cap that blew its top.
Forum: Troubleshooting Power Supplies and Power Supply Design 01-04-2019, 01:21 PM
Replies: 7
Views: 228
Posted By PeteS in CA
Re: FSP EP1000, too low output voltage.

Or noise.

Many server PSUs have microcontrollers on both sides of the pri-sec barrier, with communication between. These report to the server the input and output voltages and currents to the...
Forum: General Computer Discussion 01-02-2019, 03:42 PM
Replies: 70
Views: 1,191
Posted By PeteS in CA
Re: The 2019 Operating System Thread

I'm very non-computer-geekasoid. Win10 at home, Win7 at work.
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