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Search: Posts Made By: Agent24
Forum: Troubleshooting Power Supplies and Power Supply Design 11-22-2021, 12:03 PM
Replies: 3,146
Views: 978,747
Posted By Agent24
Re: Power supply build quality pictorial. part 2

What a fascinating design! I want one just for the sheer novelty.
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-25-2021, 06:27 PM
Replies: 84
Views: 3,862
Posted By Agent24
Re: Catapillar ECU repair, need N548AB replacement?

Oh I must have missed that.
It could possibly be designed to draw heat up the pins and dissipate out through the back plate?

I've seen mini heatsinks on a slot A motherboard that were soldered to...
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-25-2021, 05:10 AM
Replies: 84
Views: 3,862
Posted By Agent24
Re: Catapillar ECU repair, need N548AB replacement?

I'm half asleep but that didn't look much like a transistor. It doesn't seem to have a company logo either??

It looks like a hunk of metal.

I wonder if the device is actually a heatsink to help...
Forum: General Computer & Tech Discussion 09-24-2021, 08:25 PM
Replies: 36
Views: 3,894
Posted By Agent24
Re: never trust samsung

I never wanted a smart TV and now I want one even less.

It's fine, you can get regular TVs for free when other people "upgrade" haha
Forum: Troubleshooting Game Consoles & Other Weird Devices 09-17-2021, 07:51 PM
Replies: 84
Views: 3,862
Posted By Agent24
Re: Catapillar ECU repair, need N548AB replacement?

Hopefully not the case here if both are measuring the same, but I've seen MOSFETs that blew hard enough that they went open circuit after the event, while acting as a fuse for the now dead-shorted...
Forum: General Capacitor Questions & Issues 06-30-2021, 12:29 PM
Replies: 9
Views: 747
Posted By Agent24
Re: recap help AcBel PSU

Nothing so wrong with using recycled capacitors IF you remember you don't know how much longer they're going to last. You might have to replace them again in 6 months- if you're okay with that.
...
Forum: General Electronics Technical Discussion 04-24-2021, 03:53 PM
Replies: 84
Views: 4,109
Posted By Agent24
Re: LED Resistor Calculations ...

The side view drawing shows the right pad and lower pad as the same physical piece.

They could have stated it specifically, but dealing with vague datasheets is another joy of design! If in doubt...
Forum: General Electronics Technical Discussion 04-24-2021, 01:13 PM
Replies: 92
Views: 5,122
Posted By Agent24
Re: Swapping out a NiMh for a LiPo?

Sharp inner corners (45 degrees and below) can create an "acid trap" that could cause undercutting of the trace during etching.

Also, sharp angles are no good for high frequency signals, so traces...
Forum: General Electronics Technical Discussion 04-23-2021, 09:00 PM
Replies: 4
Views: 456
Posted By Agent24
Re: Theory behind "sometime works, sometime doesn't"

Keep watching to 7:38... the track was broken at the test pad due to corrosion.
Forum: General Electronics Technical Discussion 04-23-2021, 04:27 PM
Replies: 4
Views: 545
Posted By Agent24
Re: What's the use use of these things?

It can also be to protect against vibration/abrasion damage.
Forum: General Electronics Technical Discussion 04-23-2021, 04:22 PM
Replies: 7
Views: 700
Posted By Agent24
Re: What is the resistor value?

I can see what looks like a solder bridge next to the bottom right (pin 8) of the LA4570, from a through hole component to an SMD capacitor.

I also notice discolouration on some tracks and VIAs on...
Forum: General Electronics Technical Discussion 04-23-2021, 04:07 PM
Replies: 84
Views: 4,109
Posted By Agent24
Re: LED Resistor Calculations ...

While the precision of components has improved over the years, no two components are manufactured exactly the same, so no, there is no exact voltage. That's why they give a range, or just specify the...
Forum: General Computer & Tech Discussion 04-23-2021, 03:31 PM
Replies: 10
Views: 2,456
Posted By Agent24
Re: Black plastic goo question.

I've seen a few devices where rubberised or rubber parts turned to gloop but many more where they didn't, including things that are decades old. There doesn't seem to be any pattern to it.

In my...
Forum: General Computer & Tech Discussion 04-23-2021, 03:24 PM
Replies: 11
Views: 929
Posted By Agent24
Re: How to avoid shitty "McWires"?

Those wires have fewer strands than usual, too, which makes them more susceptible to breaking.
Forum: Troubleshooting Audio Equipment 03-18-2021, 06:52 PM
Replies: 174
Views: 8,476
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

Outputs: Output transistors (usually the most expensive ones)
Subs: Substitutes
Forum: Troubleshooting Audio Equipment 03-18-2021, 01:00 PM
Replies: 174
Views: 8,476
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

I find it interesting it broke when you 1) changed inputs 2) changed volume

I can imagine each of these actions has possibility to create a noise burst from dirty switch and potentiometer...
Forum: General Capacitor Questions & Issues 03-15-2021, 12:45 PM
Replies: 12
Views: 887
Posted By Agent24
Re: Identify diode

Looks like the switching MOSFET for the LED backlight driver. Driven from pin 26 of that EUP2589. Pretty weird though that the silkscreen for that MOSFET reads the pin labels like a linear regulator!...
Forum: General Capacitor Questions & Issues 03-15-2021, 12:40 PM
Replies: 12
Views: 887
Posted By Agent24
Re: Identify diode

Even if not used as a rectifier?
Forum: General Capacitor Questions & Issues 03-14-2021, 11:52 PM
Replies: 12
Views: 887
Posted By Agent24
Re: Identify diode

322C is probably the date code given that 5100B matches a diode that does exist, and one of those SB5100s would make sense given its use in circuit.

100v is just the maximum reverse voltage, it...
Forum: General Electronics Technical Discussion 03-14-2021, 10:07 PM
Replies: 92
Views: 5,122
Posted By Agent24
Re: Swapping out a NiMh for a LiPo?

NiCd can deal with trickle charging better then NiMH so you may not need to modify it at all.
Forum: General Capacitor Questions & Issues 03-14-2021, 09:54 PM
Replies: 12
Views: 887
Posted By Agent24
Re: Identify diode

The logo is not one of the classic companies, probably some random Asian one.

Possibly it's an SMD version of the SB5100? (5A, 100v Schottky)

Is it just in-line with the power supply for...
Forum: Troubleshooting Audio Equipment 03-14-2021, 05:06 PM
Replies: 174
Views: 8,476
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

If there was oscillation, I was thinking more like if the phono preamp section had already gone faulty at some point, but you didn't know because you hadn't used it until now. But it's just a random...
Forum: Troubleshooting Audio Equipment 03-14-2021, 02:12 PM
Replies: 174
Views: 8,476
Posted By Agent24
Re: Crown Amp DC300A - One channel distirted, other good.

Switching through inputs on the preamp should not cause that. Although the preamp has a separate phono preamp circuit and if that were faulty... maybe check it's not outputting DC or such when phono...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-24-2021, 11:11 PM
Replies: 17
Views: 2,257
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: 17
Views: 2,257
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,...
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