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Search: Posts Made By: PeteS in CA
Forum: Troubleshooting Power Supplies and Power Supply Design 12-06-2019, 12:48 PM
Replies: 7
Views: 153
Posted By PeteS in CA
Forum: Troubleshooting Power Supplies and Power Supply Design 11-27-2019, 01:15 PM
Replies: 24
Views: 553
Posted By PeteS in CA
Re: Dell D550p Not Starting

The 165V across the main input 'lytic probably means the PFC is not operating. And if the secondary-side controller gets status info from the primary side, the secondary-side controller is probably...
Forum: General Electronics Technical Discussion 11-07-2019, 04:21 PM
Replies: 3
Views: 181
Posted By PeteS in CA
Re: Re-purposing power supply parts

The topology for that adapter is discontinuous flyback (the seeming lack of an output inductor is the big clue). That means that the main "transformer" is actually a coupled inductor. When switch Q1...
Forum: General Capacitor Questions & Issues 11-04-2019, 02:40 PM
Replies: 10
Views: 307
Posted By PeteS in CA
Re: Different capacitors in the sassi and different values in the schematic !

Looks like a polystyrene capacitor, possibly 200pF.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-01-2019, 12:08 PM
Replies: 17
Views: 1,543
Posted By PeteS in CA
Re: Power Board MHC180-TF60SP1A from Sharp lc-60le644u TV

Did you also replace CF15, which appears to be bulging (as I posted above)?
Forum: General Capacitor Questions & Issues 10-29-2019, 01:25 PM
Replies: 957
Views: 412,037
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

Whole lot of toasty badness going on there, ruky con!
Forum: Troubleshooting Power Supplies and Power Supply Design 10-22-2019, 12:09 PM
Replies: 36
Views: 22,315
Posted By PeteS in CA
Re: Delta DPS-800GB Power Supply No Power

You probably could search that (Delta?) fan model and learn the function of that third wire.

Modern server PSUs are basically microcontroller (uC) controlled. At least some have a uC on the...
Forum: General Capacitor Questions & Issues 10-18-2019, 12:47 PM
Replies: 8
Views: 526
Posted By PeteS in CA
Re: New Asrock 775i65g 3.0 with Chemi-con KZG caps - replace now or wait?

Sometimes a date code is silk-screened onto the MB. And sometimes a date code is part of the serial number.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-15-2019, 07:31 PM
Replies: 36
Views: 22,315
Posted By PeteS in CA
Re: Delta DPS-800GB Power Supply No Power

If the PSU is controlled by a microcontroller, it might be sensing a fan failure and shutting down the PSU. Is the harness to the fan 4-wire (+12V, Return, PWM, and tachometer)? It may be that the...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-14-2019, 01:34 PM
Replies: 25
Views: 2,002
Posted By PeteS in CA
Re: Dell model L275E-01 pn: Wu142. Optiplex 755 small form factor.

While I won't disagree with your assessment of the enviros, improving efficiency of PSUs in a big server-storage farm can improve the farm's electric bill, so to speak.

Shorting out the inrush...
Forum: Troubleshooting Power Supplies and Power Supply Design 10-02-2019, 01:29 PM
Replies: 17
Views: 1,543
Posted By PeteS in CA
Re: Power Board MHC180-TF60SP1A from Sharp lc-60le644u TV

Knowing the manufacturer and series of the original caps could be helpful in determining what the closest replacements from a good vendor/series would be.
Forum: Troubleshooting Power Supplies and Power Supply Design 10-01-2019, 05:29 PM
Replies: 17
Views: 1,543
Posted By PeteS in CA
Re: Power Board MHC180-TF60SP1A from Sharp lc-60le644u TV

CF15 on the primary side looks swollen. At 5 years old, if those output caps are not good brands I'd consider replacing the ones that are not obviously bad.
Forum: General Capacitor Questions & Issues 09-30-2019, 04:12 PM
Replies: 33
Views: 989
Posted By PeteS in CA
Re: Just when you thought polymers gave a PC eternal life! - The GX745 SFF Calamity!

ZL is, generally, a pretty tough water-based electrolyte series. Water-based electrolytes tend not to do well with heat, but it took ~9 tears and a dead fan to kill the caps. Not bad.
Forum: Troubleshooting Power Supplies and Power Supply Design 09-13-2019, 06:49 PM
Replies: 1,591
Views: 337,077
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

I noticed that the output caps are Nichicon HE, which is a very good series, generally. However they use a water-based electrolyte, which do less well than non-aqueous solvent-based electrolytes with...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-11-2019, 04:29 PM
Replies: 1,591
Views: 337,077
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

If that thing is identical to the L-LINK you linked, it's basically a 150W power supply. I doubt the main transformer core is good for 200W, and those input electrolytics might have decent filtering...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-06-2019, 03:50 PM
Replies: 1,591
Views: 337,077
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

Yeah, that 150W P/S is not very safe, given the GP ceramic caps where safety-rated Y-caps should be. The 330uF primary lytics and that gimmicked 12V "rectifier" pretty much make 150W the realistic...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-28-2019, 02:47 PM
Replies: 1,591
Views: 337,077
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

470uF would probably be OK for 250W, for ripple and for hold-up time, but better than necessary is a good thing.
Forum: Troubleshooting Power Supplies and Power Supply Design 08-27-2019, 04:47 PM
Replies: 1,591
Views: 337,077
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

What a gut-free POS! The best thing that could be said for it is that they didn't substitute GP ceramic caps for Y-caps. They didn't install anything for Y-caps. And while the MJE13007 clones and the...
Forum: General Capacitor Questions & Issues 08-15-2019, 12:42 PM
Replies: 957
Views: 412,037
Posted By PeteS in CA
Re: The Hall of Shame - Badcaps Photo Montage

Well, on one hand I'm pretty sure that's a low quality brand, but on the other, it's about 12 1/2 years old. Even if it has needed hair dryer help for 2 years, that's a reasonably decent life.
Forum: General Capacitor Questions & Issues 08-14-2019, 06:16 PM
Replies: 4
Views: 373
Posted By PeteS in CA
Re: Finding a replacement cap for my snap in capacitor

Matsushita/Panasonic TSU series. The "(M)" simply means it's a +/-20% capacitor, common for electrolytics. Based on the date code of the Analog Devices IC at the center right of your picture I'm...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-09-2019, 06:11 PM
Replies: 8
Views: 8,635
Posted By PeteS in CA
Re: IDX camera power supply turns off after a while

If possible, replace both the harness connector (including contacts), and the PWA's connector, Chances are that the contacts on both connectors have been damaged. Or hard-wire the harness.

One of...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-01-2019, 08:17 PM
Replies: 11
Views: 6,299
Posted By PeteS in CA
Re: Separated Area For +5VSB Additional Filtering

Is the noise spikes? Or something like a square wave. If it is spikes the problem might be the ground lead on your oscilloscope is acting as an antenna, picking up high frequency noise. If is like a...
Forum: General Capacitor Questions & Issues 08-01-2019, 08:12 PM
Replies: 7
Views: 501
Posted By PeteS in CA
Re: Help with Power on yamaha receiver (capacitors?)

It could be a date or source code. That capacitor is a .01uF, 5% part, probably metallized polyester film.
Forum: Troubleshooting Power Supplies and Power Supply Design 07-29-2019, 05:09 PM
Replies: 5
Views: 4,194
Posted By PeteS in CA
Re: Mac Pro PSU

Do you know that one of the 12V outputs is dropping out? With only 12V power going to the MB, that means the various logic voltages are generated by DC-DC converters on the MB. The MB is also likely...
Forum: Troubleshooting Power Supplies and Power Supply Design 07-18-2019, 08:01 PM
Replies: 1,591
Views: 337,077
Posted By PeteS in CA
Re: the gutless, bloated, and fried power supply hall of shame

What a pathetic POS (Oh, Deer?). It'd probably do 200W-250W, crappily, but it has GP ceramic Y caps. Unsafe at any power. The label rating says 400W, but even the output harness wires aren't good for...
Showing results 1 to 25 of 500

 
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