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Search: Posts Made By: Agent24
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2021, 11:11 PM
Replies: 13
Views: 1,152
Posted By Agent24
Re: Asistance required on troubleshooting Corsair CX500

Second hand CROs are pretty cheap, but who can say it will be useful in this scenario, especially if there were random spikes or such.



You are quite possibly right. The primaries are always...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2021, 03:30 AM
Replies: 13
Views: 1,152
Posted By Agent24
Re: Asistance required on troubleshooting Corsair CX500

Has anyone tried scoping the APFC circuitry to see if there are voltage spikes etc?
Even comparing between a working and faulty version of the same model?
I guess you'd need a pretty fast,...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2021, 03:23 AM
Replies: 1,678
Views: 395,730
Posted By Agent24
Re: the gutless, bloated, and fried power supply hall of shame

Did he offer the class Kool-Aid as well?... :p:
Forum: Troubleshooting Audio Equipment 02-17-2021, 02:03 PM
Replies: 16
Views: 370
Posted By Agent24
Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!

I wonder if the varnish/glue melted from heat and loosened up.

Can you try something that has a higher melting point than hot glue?

Perhaps desolder the transformer and dip it in a high...
Forum: Troubleshooting Audio Equipment 02-17-2021, 12:59 PM
Replies: 16
Views: 370
Posted By Agent24
Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!

Great! The varnish should be all you need though, so you probably don't need the hot glue, and in fact it may be better not to have too much stuff covering everything, otherwise things could overheat.
Forum: Troubleshooting Audio Equipment 02-15-2021, 01:51 PM
Replies: 16
Views: 370
Posted By Agent24
Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!

Phenolic/SRPB circuit board?
Awful tan glue on everything?

I think the power supply is a victim of "cost optimisation"

Could be noisy from cheaply made & loose transformer, or a cheap circuit...
Forum: Troubleshooting Audio Equipment 02-14-2021, 07:16 PM
Replies: 14
Views: 371
Posted By Agent24
Re: Mitsumi M32E-3 CD tray motor

There are many such small DC motors available on AliExpress etc. How long they last is a different story, but you may well find one that can fit.

Again, it would help to see a photo of the...
Forum: Troubleshooting Audio Equipment 02-14-2021, 07:14 PM
Replies: 16
Views: 370
Posted By Agent24
Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!

Just poke/touch them with the insulated stick and see if the sound changes / stops when you press on it (gently).

The noise is caused by the coil or other component vibrating at an audible...
Forum: General Electronics Technical Discussion 01-27-2021, 01:09 AM
Replies: 7
Views: 293
Posted By Agent24
Re: Have you tried to socket mosfet?

Good point. In the past I bought various cheap connectors with plastic that couldn't stand much heat. Another reason to buy real branded parts from known suppliers. I think Dave Jones did a video on...
Forum: General Electronics Technical Discussion 01-22-2021, 08:18 PM
Replies: 10
Views: 469
Posted By Agent24
Re: Load Testing Audio PA Amplifiers

Add the speaker in parallel to the load but include a series resistor for it to lower the signal level so it doesn't get blown?
Forum: General Electronics Technical Discussion 01-22-2021, 08:15 PM
Replies: 87
Views: 1,376
Posted By Agent24
Re: How could I find a FET with specific specs?

That circuit takes the small current available from the micro-controller pin, and amplifies it with the transistor to drive the LEDs.

This will turn them on full.

But PWM turns them on and off...
Forum: General Electronics Technical Discussion 01-22-2021, 08:02 PM
Replies: 7
Views: 293
Posted By Agent24
Re: Have you tried to socket mosfet?

Why do you want to use sockets? There should be no need. I would not use them for a MOSFET for fear of loose connection. Even at low loads an intermittent connection could cause damage depending on...
Forum: General Electronics Technical Discussion 01-22-2021, 07:59 PM
Replies: 13
Views: 561
Posted By Agent24
Re: How is called that compound that glues components on the PCB?

It's not just cheap silicone that uses acid. Most use acid. In my local hardware stores, EVERY silicone uses acid even the most expensive brands.

Some even say things like "Organic Acid" or "Low...
Forum: General Electronics Technical Discussion 01-22-2021, 07:51 PM
Replies: 18
Views: 4,335
Posted By Agent24
Re: Repairing Remotes

The most confusing remote repair I did was on my Sony STR-DE545 amplifier.


The remote stopped controlling the amplifier.

The remote had a red LED on it to show when commands were being...
Forum: General Electronics Technical Discussion 01-22-2021, 07:41 PM
Replies: 6
Views: 320
Posted By Agent24
Re: Who can help to tell the resistor value please?

Looks like a laptop?
Current sense resistor for AC or battery power circuit it looks like.

What is the problem with the laptop?
Forum: Troubleshooting Power Supplies and Power Supply Design 12-28-2020, 06:43 PM
Replies: 173
Views: 56,641
Posted By Agent24
Re: LiteOn PA-6601-1A (600w) blows its TOP

Maybe he meant SOIC package? That may be okay for high voltage depending on the pinout and circuit design - some integrated PWM/FET chips run in a SOIC-8 package (albeit often with only 7 pins) for...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-28-2020, 03:44 AM
Replies: 173
Views: 56,641
Posted By Agent24
Re: LiteOn PA-6601-1A (600w) blows its TOP

Do those MOSFETs switch mains?

Probably when those original ones blew, they shorted and damaged their drive circuitry (or it contained the original fault).

Now with damaged drive circuits, the...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-24-2020, 08:34 PM
Replies: 61
Views: 9,013
Posted By Agent24
Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

Your photos show a switching power supply. These do not typically have thermal fuses in the transformer.

In any case, a fuse that blows audibly will be from over-current, not over-temperature,...
Forum: Troubleshooting Power Supplies and Power Supply Design 12-24-2020, 12:07 PM
Replies: 61
Views: 9,013
Posted By Agent24
Re: 18VDC PSU has dropped to 10v - ZD-915 desoldering station

Please take and post photos.

That it died with a 'pop' implies something in the primary side blew up. If you look carefully you should be able to spot the damage.
Forum: Troubleshooting Audio Equipment 12-19-2020, 02:28 PM
Replies: 111
Views: 51,370
Posted By Agent24
Re: Logitech Z506 power supply

Do you have or can you get freezer spray? That can help find an overheating issue.
Forum: Troubleshooting Audio Equipment 12-17-2020, 12:31 AM
Replies: 111
Views: 51,370
Posted By Agent24
Re: Logitech Z506 power supply

Does the power supply still output correct voltage after the speaker stops working? Then you can find if it's a power supply or speaker problem.

It seems these can handle 19v OK, going by the...
Forum: Troubleshooting Audio Equipment 12-16-2020, 10:58 PM
Replies: 111
Views: 51,370
Posted By Agent24
Re: Logitech Z506 power supply

Please add photos in another post - on your first post I don't think you can add pictures but after that you can.

Do you have freezer spray? You may try to use that to find an overheating issue...
Forum: Troubleshooting Power Supplies and Power Supply Design 11-23-2020, 01:27 PM
Replies: 52
Views: 6,735
Posted By Agent24
Re: Raidmax RX-600 ringing noise and 0ms PG

Nice job!
The photo isn't bad, I can see everything okay.

But yeah, I was pretty sure that diode didn't look so good. Always a good idea to investigate anything that looks physically damaged.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-17-2020, 01:37 PM
Replies: 52
Views: 6,735
Posted By Agent24
Re: Raidmax RX-600 ringing noise and 0ms PG

LOL that would explain a lot.
Forum: Troubleshooting Power Supplies and Power Supply Design 11-17-2020, 12:58 PM
Replies: 52
Views: 6,735
Posted By Agent24
Re: Raidmax RX-600 ringing noise and 0ms PG

The electrolytic could if it were open-circuit, or if the TL431 was shorted.
Or even if the transistor were shorted B-E the capacitor may charge too fast through it. But that seems unlikely.

This...
Showing results 1 to 25 of 500

 
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