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Search: Posts Made By: Per Hansson
Forum: General Capacitor Questions & Issues 11-27-2022, 03:01 AM
Replies: 16
Views: 272
Posted By Per Hansson
Re: Fake polymers?

These capacitors might be original, however they are over 22 years old based on the date code on the packaging!





Sanyo capacitors do have X vents in the larger diameter series, these could...
Forum: General Capacitor Questions & Issues 11-19-2022, 05:22 AM
Replies: 1
Views: 142
Posted By Per Hansson
Re: Is ESR value different between on Circuit and off Circuit?

There are several things to keep in mind when measuring capacitors in circuit:
If there are two capacitors in parallel you will have no idea if one of them is bad.
If there are resistors in...
Forum: General Electronics Technical Discussion 11-06-2022, 05:06 AM
Replies: 3
Views: 283
Posted By Per Hansson
Re: Help me please 😭

Desolder it and clean the PCB so you can see where things are connected.
It may be a TVS diode, see this page for an explanation:
http://www.users.on.net/~fzabkar/HDD/TVS_diode_FAQ.html
Forum: General Capacitor Questions & Issues 10-08-2022, 01:41 AM
Replies: 8
Views: 470
Posted By Per Hansson
Re: 70 and 80 uF 250 VAC Caps

In general you can consider most induction motors (asynchronous motors) as being 3-phase.
The reason is you need a rotating magnetic field to turn the motor around, and this will not exist with a...
Forum: Troubleshooting Audio Equipment 10-06-2022, 11:50 AM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

It's the chip in your photo here: https://www.badcaps.net/forum/attachment.php?attachmentid=275003&d=1664498435
In one of Khron's older posts he mentions how to do that mod.
But it is also in his...
Forum: General Capacitor Questions & Issues 10-04-2022, 01:27 PM
Replies: 10
Views: 650
Posted By Per Hansson
Re: Supercapacitors/EDLCs...why are they failing?

It must be something wrong with the implementation:
Siemens uses them in their 840D PLC units as a backup for the 3v lithium battery (so you have like 20 mins to replace it with the power off)
I've...
Forum: Troubleshooting Audio Equipment 09-05-2022, 01:00 PM
Replies: 158
Views: 3,655
Posted By Per Hansson
Re: Help with blowing transistor NAD T752 receiver

Yup that looks to be the same size to me also, another very important factor is how well they are attached to the heatsink, some cheap crap is made very poorly but this looks soldered so I'd say they...
Forum: Troubleshooting Audio Equipment 09-05-2022, 12:48 PM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Ok, I have no idea then what the issue can be.
Forum: Troubleshooting Audio Equipment 09-04-2022, 10:44 AM
Replies: 158
Views: 3,655
Posted By Per Hansson
Re: Help with blowing transistor NAD T752 receiver

I would take your current destroyed parts and open them up:
You have one original from the unit and the one you bought.
Open them both and see if the die is the same physical size.
If it is not...
Forum: Troubleshooting Power Supplies and Power Supply Design 08-27-2022, 05:14 AM
Replies: 9
Views: 645
Posted By Per Hansson
Re: Liteon PS-6251-2H8 - Top222 - 5VSB >> 6.2V!

Well, take note that this chip is not a fixed 5v regulator.
So any failure in the feedback path (they call it "control" in the datasheet) could make the 5VSB higher or lower, depending on what...
Forum: Troubleshooting Audio Equipment 08-26-2022, 12:29 PM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Well you can just measure and compare what voltages you see on the ports with no input vs the other working set that did not have the issue with the shorted post.
Possibly one of the op-amps is...
Forum: General Electronics Technical Discussion 08-22-2022, 10:00 AM
Replies: 44
Views: 2,225
Posted By Per Hansson
Re: MIG-130 feed motor PCB GI-PCB-H59-A0 repair (old: Help me with capacitor replacem

Nice work!
I changed the thread title to make it more visible for Google searches...
Forum: General Electronics Technical Discussion 08-21-2022, 12:59 PM
Replies: 44
Views: 2,225
Posted By Per Hansson
Re: Help me with capacitors replacement

With my previous post here (https://www.badcaps.net/forum/showpost.php?p=1156133&postcount=19) doing a Google search you can find this page linked below for example.
That was why I wrote this welder...
Forum: Troubleshooting Audio Equipment 08-20-2022, 09:29 AM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Yes, better to keep this thread focused on only the Alesis M1 MK2 speakers.
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 08-17-2022, 07:36 AM
Replies: 6
Views: 507
Posted By Per Hansson
Re: Replace memory module with lower density

Possibly you could get it working by flashing a BIOS of a card that actually have the same or lower amount of memory as what you installed.
You can look in the Techpowerup GPU BIOS database for one.
Forum: General Computer & Tech Discussion 08-16-2022, 12:46 PM
Replies: 8
Views: 1,723
Posted By Per Hansson
Re: Looking to buy a new laptop computer for doing 3D drawing software for a 3D print

Have you tried to install the official Lenovo sound drivers?
I made a clean install on mine when it was brand new (an older model than yours) and it always sounded like shit.
Then for some reason I...
Forum: Troubleshooting Audio Equipment 08-16-2022, 10:48 AM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Yea there must be something odd with the Behringer to cause that.
I guess you could try e-mailing or calling them to see if they have any ideas.
Forum: Troubleshooting Audio Equipment 08-16-2022, 08:21 AM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

The voltages you should have on C8 and purple to green you can measure when the Behringer is not connected...
But to get a pretty good idea you can look at the picture in this sticker ;)...
Forum: Troubleshooting TVs and Video Sources 08-15-2022, 01:47 PM
Replies: 31
Views: 2,009
Posted By Per Hansson
Re: Phillips 50PF7321D/37 Plasma slow reboot

The likely component would be a capacitor, but it can be any component really, or even a solder joint.
You might be able to narrow it down further by doing more localized heating of components and...
Forum: General Electronics Technical Discussion 08-15-2022, 09:40 AM
Replies: 24
Views: 1,369
Posted By Per Hansson
Re: Old analog Power Supply needs your advice

The transformer is missing.
Forum: Troubleshooting Audio Equipment 08-15-2022, 09:37 AM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Ok, no I have no idea why that might be, it does seem very strange!
If you want to trouble shoot it further you could measure the voltage across C8 when it happens.
Or perhaps better: the output...
Forum: General Electronics Technical Discussion 08-15-2022, 08:03 AM
Replies: 44
Views: 2,225
Posted By Per Hansson
Re: Help me with capacitors replacement

I don't know where you got "grooves" from, I said traces.
You need to remove the traces according to the picture in my post.
Otherwise the clearance is too small and it will just arc over again....
Forum: Troubleshooting Audio Equipment 08-15-2022, 07:53 AM
Replies: 451
Views: 151,043
Posted By Per Hansson
Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Does the Behringer work with any other speakers?
And does the same thing happen with both speakers or only one of them?
If only one of them, is it the same speaker as you mentioned in this quote:
Forum: General Electronics Technical Discussion 08-14-2022, 08:54 AM
Replies: 44
Views: 2,225
Posted By Per Hansson
Re: Help me with capacitors replacement

Yes sure, I'd pick the one with the longer legs, just because I could not find a datasheet for the other one.
Forum: General Electronics Technical Discussion 08-14-2022, 06:41 AM
Replies: 44
Views: 2,225
Posted By Per Hansson
Re: Help me with capacitors replacement

It does not matter, the original is only rated for 2A so it should be more than that.
But any bridge rectifier you have in that large package I showed is going to be rated for more than that...
I...
Showing results 1 to 25 of 500

 
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