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Search: Posts Made By: momaka
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 01:37 PM
Replies: 27
Views: 13,087
Posted By momaka
Re: D-Link router - faulty power brick?

Alright, here are the pictures:
https://www.badcaps.net/forum/attachment.php?attachmentid=220335&stc=1&d=1600803391...
Forum: Troubleshooting Power Supplies and Power Supply Design Yesterday, 12:17 PM
Replies: 27
Views: 13,087
Posted By momaka
Re: D-Link router - faulty power brick?

TO-220 resistor?
From what I remember, and the pictures I've attached previously, there are only two TO-220 devices: a MOSFET on the primary side in an isolated TO-220 case and a schottky rectifier...
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-21-2020, 03:51 PM
Replies: 6
Views: 72
Posted By momaka
Re: Fisher Scientific T-30 Metal Detector - Circuit schematic

Looks like someone soldered two "modern" resistors in there at some point. I wonder why that was.

Unfortunately, I don't have much knowledge in the way of metal detector theory, but if bad comes...
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-21-2020, 03:29 PM
Replies: 6
Views: 115
Posted By momaka
Re: Kitchen range hood not turning on

Is that a picture of the power supply board after you replaced the capacitors?
If yes, it looks like the capacitors you used aren't low ESR/impedance type, which is usually necessary for switch-mode...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-21-2020, 01:19 PM
Replies: 81
Views: 3,812
Posted By momaka
Re: Task TK-940TX-DF Blowing fuse

Buzzing for single-transistor forward PSUs typically means over-load condition.

However, since you have a series light bulb, it could also be a false over-load condition, as some PSUs simply don't...
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-21-2020, 12:47 PM
Replies: 145
Views: 28,707
Posted By momaka
Re: Original Xbox Replacement Caps

Ah... yeah.... that would be my copypasta.
Thanks for catching that! Fixed it now. ;)


In that case, likely OK to use them.
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-21-2020, 12:04 PM
Replies: 145
Views: 28,707
Posted By momaka
Re: Original Xbox Replacement Caps

It depends.
If the caps are in parallel, then... MAYBE :D

I say "maybe" because of ESR.

For a number of _identical_ caps in parallel, the total equivalent ESR/impedance in the circuit, Z, will...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-20-2020, 03:05 AM
Replies: 81
Views: 3,812
Posted By momaka
Re: Task TK-940TX-DF Blowing fuse

Yup, should be OK for testing.
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-19-2020, 06:40 PM
Replies: 145
Views: 28,707
Posted By momaka
Re: Original Xbox Replacement Caps

The first one with the direct link and I think the one with the Foxlink PSU... and maybe a few others. It was a bit random.

Just to make sure, I did try viewing this thread on different PCs and...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-19-2020, 06:23 PM
Replies: 6
Views: 322
Posted By momaka
Re: Help me identify missing component from Radeon HD4850

Well, that works too. :rejoice: Congrats on yet another repair! :smile:

Those X1300 cards (along with HD2400 Pro and HD3450 Pro) were literally sold by the bucket on eBay not too long ago... and...
Forum: Troubleshooting Power Supplies and Power Supply Design 09-19-2020, 06:10 PM
Replies: 81
Views: 3,812
Posted By momaka
Re: Task TK-940TX-DF Blowing fuse

Alrighty... looks like you finally got the issue with the bulb resolved. :)

I suppose you can continue with reinstalling all the other components for the main PS (minding the orientation a little...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-19-2020, 03:08 PM
Replies: 17
Views: 827
Posted By momaka
Re: Abit BX133-RAID odd issue, bad caps?

Hmmm.

Being socket 370, the socket is surely pinned (i.e. not BGA), so I doubt contact between socket pins and mobo is bad... but do check socket solder joints on board under good light, if you...
Forum: General Electronics Technical Discussion 09-19-2020, 02:28 PM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

According to the label, it has a 11.2V, 2000 mAh Li-Polymer battery:
https://www.badcaps.net/forum/attachment.php?attachmentid=219695&d=1599925301

Would indeed be interesting to know if the issue...
Forum: General Electronics Technical Discussion 09-15-2020, 05:24 PM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

What isn't today? :p: They are putting "smart" MCUs in everything.
Also, haven't you seen Demolition Man, the movie? With the way things are headed with VR and smart technology... and now with...
Forum: General Electronics Technical Discussion 09-15-2020, 11:48 AM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

Was there a thin wire inside the thin clear tube as well? If so, this might be some kind of shielded wire. Or it could also be that the clear tube inside was for reinforcement... though I'm leaning...
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-15-2020, 11:44 AM
Replies: 145
Views: 28,707
Posted By momaka
Re: Original Xbox Replacement Caps

KZE -> very very reliable
I would leave them.


I still don't see half of the images from the offsite links, but the one that did load up eventually... yep 100% fake indeed.

jayjr1105, can you...
Forum: General Electronics Technical Discussion 09-14-2020, 11:38 PM
Replies: 46
Views: 607
Posted By momaka
Thumbs up Re: Spectra S1+ Breast pump - No suction

Nice job finding the fault fellas! Glad to see another repair success story. :smile:
Forum: General Electronics Technical Discussion 09-13-2020, 06:46 PM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

Do any of the resistor leads of R21 or R30 connect to top pin of Q9? If not, what about Q11? I'm curious what drives Q7.


Hmm. So the 0-4V fluctuation is consistent with the clicking?
Can you...
Forum: General Computer & Tech Discussion 09-13-2020, 06:25 PM
Replies: 4,666
Views: 723,738
Posted By momaka
Re: best cheap/free scores 1.1

IDK :why: Alt-PrintScreen works fine for me - just screeshots only the active Windows I have open. But maybe across multiple monitors, it gets tripped up? I'm a single-monitor guy, so I'll probably...
Forum: General Computer & Tech Discussion 09-13-2020, 04:17 PM
Replies: 4,666
Views: 723,738
Posted By momaka
Re: best cheap/free scores 1.1

All these years using Windows, and I still never knew this one. Thanks, I learned something useful today. I suppose my expert cropping skills in MS Paint will no longer be needed as much. :jester:
...
Forum: General Electronics Technical Discussion 09-13-2020, 04:00 PM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

Those look OK, I suppose, particularly U4.

Try the device with the power adapter instead of the battery. Perhaps L1 then might have a different voltage.



It may cause a problem, depending on...
Forum: General Electronics Technical Discussion 09-13-2020, 12:39 PM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

That means driver chip is likely not shorted.


No, just similar capacitance values or somewhere in the ballpark (up to +/-50% will probably be OK.) Since device is operated at 12V, you don't...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 09-13-2020, 12:23 PM
Replies: 5
Views: 293
Posted By momaka
Re: Sony Hit Bit MSX HB-75B restoration repair attempt

Yup, that's the standard procedure for almost anything dumpster-picked or 2nd hand device I get here. Warm water + soap detergent + let it dry under the sun for a few days usually gives pretty good...
Forum: General Electronics Technical Discussion 09-13-2020, 12:02 PM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

Try measuring the resistance between Source and Gate, then report back what you get. Make sure battery and power source are both removed when doing these measurements, so they don't impact the...
Forum: General Electronics Technical Discussion 09-13-2020, 10:18 AM
Replies: 46
Views: 607
Posted By momaka
Re: Spectra S1+ Breast pump - No suction

No, to turn a P-ch MOSFET On, you ground the Gate if Source is connected to the positive output of the PSU.

With Gate Voltage = Source Voltage, P-ch MOSFET will be off.


Remove out of the...
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