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Search: Posts Made By: PeteS in CA
Forum: Troubleshooting Power Supplies and Power Supply Design 09-22-2021, 06:24 PM
Replies: 22
Views: 3,485
Posted By PeteS in CA
Re: Enermax PRO 82+ 525W repair

Inrush limiting thermistors are like fuses. They blow if something else draws excessive current.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-21-2021, 11:15 AM
Replies: 5
Views: 186
Posted By PeteS in CA
Re: Corsair CX750M [Model 75-002019] - burned output toroid inductor

Fair-Rite and Mag Inc. produce ferrite materials, and Mag Inc. produces molypermalloy powder and other specialty powdered-materials (as well as tape wound cores, a whole different aminal).
...
Forum: General Electronics Technical Discussion 09-21-2021, 10:59 AM
Replies: 3
Views: 142
Posted By PeteS in CA
Re: line powered filament LED lamps...

With traditional incandescent light bulbs, brightness is average voltage dependent. LED brightness is current dependent.

Hooking a simple series string of LEDs across the line would result in an...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-20-2021, 12:52 PM
Replies: 5
Views: 186
Posted By PeteS in CA
Re: Corsair CX750M [Model 75-002019] - burned output toroid inductor

Micrometals -26 material - powdered iron, 75 permeability, THE standard material long used in switching power supplies with switch frequencies under 50KHz (e.g. those using BJTs). Yellow body with a...
Forum: General Capacitor Questions & Issues 09-15-2021, 06:18 PM
Replies: 992
Views: 484,014
Posted By PeteS in CA
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-15-2021, 06:13 PM
Replies: 5
Views: 213
Posted By PeteS in CA
Re: Help with capacitor for graphics card

That circular thingy next to the "2" of "270" is the manufacturer's logo, which I don't recognize. The "5KR43" is probably the manufacturers date and/or factory code (probably both).

The part is...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-13-2021, 05:09 PM
Replies: 4
Views: 215
Posted By PeteS in CA
Re: Big Blue -- What is this component?

That one rectifier or ?? seems to have a chunk missing.

One of the rectifiers has "7912" marked on it. 12th week of 1979?

Dry tantalums sometimes catch fire or get really hot, burning PCBs and...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-10-2021, 12:33 PM
Replies: 24
Views: 585
Posted By PeteS in CA
Re: ATX PSU Tester Analyzer modification / upgrade

If it will work from 5VSB, you could always have diode-isolated "battery back-up":


https://n2.sdlcdn.com/imgs/g/i/9/Duracell-9-Volt-Alkaline-9-SDL833337425-2-de302.jpeg
Forum: General Capacitor Questions & Issues 09-10-2021, 12:24 PM
Replies: 60
Views: 13,739
Posted By PeteS in CA
Re: Any more info on counterfeit Nichicons?

The KZE series caps I tested in 2005 while at Curtis Instruments had green sleeves. Your memory of the time frame is correct. IIRC, KZE series parts I tested later (2005-2008 and part of January...
Forum: General Capacitor Questions & Issues 09-08-2021, 06:45 PM
Replies: 199
Views: 270,080
Posted By PeteS in CA
Re: The GOOD Capacitors Thread!!

My test results are not online, and are with my employer of that time, two jobs ago now. My test fixturer was designed by an engineer at the company, and I built most of the test fixtures I used. It...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-07-2021, 02:04 PM
Replies: 5
Views: 6,883
Posted By PeteS in CA
Re: iMac 27'' Blown Power Supply Repair

Sounds like the source of that primary auxiliary voltage is starting up and then shutting down. I'm not familiar with the specific power supply, but if it has a separate auxiliary regulator for the...
Forum: General Capacitor Questions & Issues 09-07-2021, 01:48 PM
Replies: 10
Views: 340
Posted By PeteS in CA
Re: Toshiba kitchen food processor (model: TFP 1500) Capacitor value ?

I don't know if the company still makes the part, but I'm pretty sure the original part was made by Wima, https://www.wima.de/en/ .
Forum: General Capacitor Questions & Issues 09-07-2021, 01:43 PM
Replies: 6
Views: 337
Posted By PeteS in CA
Re: Help identifying an old capacitor

The manufacturer of those parts was Ceramite, a spin-off from Sprague. The series is 30LV. More to the point, Ceramite was bought by Vishay, https://www.vishay.com/docs/23084/ceramite.pdf . They are...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-18-2021, 04:32 PM
Replies: 6
Views: 367
Posted By PeteS in CA
Re: Morex Int'l ATX-300C, worth a recap?

Looks like a fairly ordinary half bridge design, possibly with BJTs instead of MOSFETs. The core material for the output inductor is best for switch frequencies under 50KHz. The size of the...
Forum: General Capacitor Questions & Issues 08-12-2021, 12:43 PM
Replies: 53
Views: 9,554
Posted By PeteS in CA
Re: Würth Elektronik Electrolytic Capacitors Official Thread

Back in ca. 2006 I torture-tested some Jianghai. At the time Evox-Rifa was distributing them. Compared to the several ______con and Panasonic series that did well, the Jianghai were junk, in the same...
Forum: General Capacitor Questions & Issues 08-11-2021, 10:38 AM
Replies: 199
Views: 270,080
Posted By PeteS in CA
Re: The GOOD Capacitors Thread!!

Lelon low impedance caps did poorly in my torture tests back in 2005 or 2006. As did UCC KZG and KZJ a year or two later, much to my surprise at the time. UCC LXV, LXZ, KZE, and KY did well; Rubycon...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-09-2021, 12:29 PM
Replies: 6
Views: 527
Posted By PeteS in CA
Re: NCP1271 power supply not working under load

If the actual circuit is similar to the sample circuit on the datasheet, one possibility is that the current sense resistor in the MOSFET Source circuit has increased in value and loading the power...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-05-2021, 04:23 PM
Replies: 3,141
Views: 954,866
Posted By PeteS in CA
Re: Power supply build quality pictorial. part 2

CapXon is a brand not respected here. However it looks like some of the output capacitors are polymer types.

The power supply puzzles me. It is rated as simple "80 Plus", but those heatsinks look...
Forum: Troubleshooting Laptops, Portable, and Mobile Devices 08-02-2021, 04:00 PM
Replies: 4
Views: 252
Posted By PeteS in CA
Re: Help identifying motherboard capacitors

.24 microhenry?

If that inductor has a problem, it is likely that something is shorted or drawing too much current.
Forum: General Capacitor Questions & Issues 07-29-2021, 12:11 PM
Replies: 8
Views: 479
Posted By PeteS in CA
Re: Should I use low ESR caps in TV power supply board, or will any kind suffice?

A low impedance cap in a general purpose application should be OK. A general purpose cap in an application needing a low impedance part will likely result in the cap having a short life.

So, how...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-28-2021, 12:11 PM
Replies: 4
Views: 372
Posted By PeteS in CA
Re: Macintosh Quadraa 630 dead power supply

Mea Matha Goofa. The big input 'lytic is from Rubycon, a good vendor, and those are not stressed to the same degree as the output capacitors.

I didn't notice it yesterday, but that Dyna Comp P/S...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-27-2021, 01:40 PM
Replies: 4
Views: 372
Posted By PeteS in CA
Re: Macintosh Quadraa 630 dead power supply

Judging by all those nice Thomson CSF box film capacitors, that P/S must be on the order of 35 years old. So those output caps are probably all bad. Cap technology has probably progressed to the...
Forum: General Capacitor Questions & Issues 07-27-2021, 12:54 PM
Replies: 11
Views: 845
Posted By PeteS in CA
Re: J107 Tantalum cap burning inside a USB hub?

Tantalum caps can fail that way. Circa 1997, after a burning tantalum cap led to a large computer center being shut down (and a VERY POed customer!), Sun Microsystems banned tantalum caps from all...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-26-2021, 11:29 AM
Replies: 7
Views: 526
Posted By PeteS in CA
Re: Newton Power NPS-400AB Powers on for 2-3seconds then powers off

Having worked for Newton Power's corporate parent, Delta Products, 1998-2001, I am 99% sure that the "1002DS" is a combination PFC controller and PWM controller, and "7K25" is the date code. If it...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-26-2021, 11:12 AM
Replies: 25
Views: 3,703
Posted By PeteS in CA
Re: Delta DPS-200PB-185A Schematic

Unfortunately, the picture is so blurry that I can "read" the values without my glasses as well as I can with my glasses. I've seen high value resistors used for the function you described in...
Showing results 1 to 25 of 500

 
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