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Search: Posts Made By: Per Hansson
Forum: General Computer & Tech Discussion 02-27-2021, 02:47 AM
Replies: 13
Views: 1,762
Posted By Per Hansson
Re: Building a gaming rig for my dad...

Sounds like a fun project, maybe you could get it all going with just a new mainboard and not be out by much?
If your dad prefers older operating systems remember that Win7 only works natively with...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-27-2021, 02:16 AM
Replies: 16
Views: 547
Posted By Per Hansson
Re: How can I desolder chock coil in PGA370 socket mainboard

You could probably get away with replacing this capacitor with either 1200F or 2200F.
But they need to be low ESR capacitors, otherwise it will not work.
Below is the datasheet of the original...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-26-2021, 12:25 PM
Replies: 16
Views: 547
Posted By Per Hansson
Re: How can I desolder chock coil in PGA370 socket mainboard

After the above questions above I would look into the capacitors.
It looks like the sticky gunk under the coil came from the capacitors.
Because in your latest pictures I can see it also under the...
Forum: Troubleshooting Computer Displays 02-26-2021, 11:49 AM
Replies: 3
Views: 208
Posted By Per Hansson
Re: Dell 2209wa - momentarily blinks every two seconds [ Video + Audio + Service Manu

You can only edit your post for a short time after it has been posted.
This is mainly to prevent clever spam bots going in and editing in spam after a few weeks when no one will notice...

As for...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-26-2021, 11:24 AM
Replies: 43
Views: 11,766
Posted By Per Hansson
Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Nice, thanks for posting the solution.
It might be a good idea to get the communication cable.
So you can actually check the bus voltage and be 100% sure of the fix :)
Forum: General Electronics Technical Discussion 02-25-2021, 12:53 PM
Replies: 47
Views: 808
Posted By Per Hansson
Re: Oscilliscopes

This looks normal to me, but one important thing you did not mention yet:
stj asked if you had removed the ground clip when taking these measurements?
It is important to understand that the ground...
Forum: Troubleshooting Game Consoles & Other Weird Devices 02-25-2021, 12:07 PM
Replies: 5
Views: 124
Posted By Per Hansson
Re: Heres a fun one. 630w dual bulb Ceramic Metal Halide Transformer

I attached your photo to the OP.
It looks to me like a component near the transformer has exploded.
Maybe that resistor but it is not really visible in your picture.
...
Forum: General Capacitor Questions & Issues 02-22-2021, 12:53 PM
Replies: 5
Views: 280
Posted By Per Hansson
Re: Nichicon PC(M) replacement

It could be glue but then you would expect the same under other components so I guess not.
It looks like the board is conformally coated, maybe the electrolyte somehow dissolved that and created...
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-21-2021, 01:43 PM
Replies: 27
Views: 1,391
Posted By Per Hansson
Re: junky Jetway P4MDPT board

http://www.paullinebarger.net/DS/Chemi-con/UCC%20DATE%20DECODE.pdf

June 2009
Forum: Troubleshooting Power Supplies and Power Supply Design 02-20-2021, 01:46 AM
Replies: 22
Views: 682
Posted By Per Hansson
Re: Corsair AX850 low 12v and 5v voltage with random reboots.

That's really impressive you found the culprit in such a complex PSU!
Did you take any pictures of the capacitor that was bad and its location?
Maybe it could help someone in the future...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-19-2021, 10:20 AM
Replies: 43
Views: 11,766
Posted By Per Hansson
Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Ok, you can always connect via serial, see post #12 (https://www.badcaps.net/forum/showpost.php?p=806302&postcount=12).
Forum: Troubleshooting Power Supplies and Power Supply Design 02-18-2021, 01:05 PM
Replies: 22
Views: 682
Posted By Per Hansson
Re: Corsair AX850 low 12v and 5v voltage with random reboots.

If the unit got hotter than 110C for a few hours then it is possible.
Why don't you use the warranty claim, these come with a 10 year warranty.
Forum: Troubleshooting Power Supplies and Power Supply Design 02-18-2021, 12:16 PM
Replies: 22
Views: 682
Posted By Per Hansson
Re: Corsair AX850 low 12v and 5v voltage with random reboots.

It is highly unlikely to be bad capacitors: this range of power supplies uses good capacitor brands.
Have you used a multimeter to measure the 12v voltage or what is the source you know for it being...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-18-2021, 10:30 AM
Replies: 43
Views: 11,766
Posted By Per Hansson
Re: Mitsubishi Melservo MR-J2S-100A alarm: AL.E9

Welcome to Badcaps!
Your servo also has the LCD display, it is just in another location.
I attached photos of a 200A servo here, you can see the display behind the cover shows 322v.
This DC...
Forum: Troubleshooting Audio Equipment 02-15-2021, 02:49 PM
Replies: 16
Views: 384
Posted By Per Hansson
Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!

Yup, if there is enough room to squeeze it under...
Forum: Troubleshooting & Designing Networks 02-15-2021, 02:36 PM
Replies: 23
Views: 861
Posted By Per Hansson
Re: Packet loss on LAN...

Yes, you can set the size with the -l parameter in Windows, like so:
ping -l 60000
Should be around a megabit or so.
There are better ways, like copying a file over the network of course :)
But...
Forum: Troubleshooting Audio Equipment 02-15-2021, 02:19 PM
Replies: 16
Views: 384
Posted By Per Hansson
Re: Boston Acoustics Soundware 5.1 SUB: Agonizing coil whine!

The ferrite on that transformer is not aligned well, that might be the issue.
But I would be really careful about realigning it as it could crack, and then it is game over.
Easiest might be to try...
Forum: Troubleshooting Power Supplies and Power Supply Design 02-15-2021, 02:11 PM
Replies: 9
Views: 438
Posted By Per Hansson
Re: Enermax Liberty ECO 400W [ELT400AWT] - from scraped to serviced

Nice writeup, I would measure the main bulk capacitor, just to make sure the noise is not from it being failed.
Forum: General Electronics Technical Discussion 02-15-2021, 01:48 PM
Replies: 12
Views: 446
Posted By Per Hansson
Re: General question about oscilliscopes

Agreed, but this one and the other is very useful to keep in the back of your mind when you work with a scope.
Both of these can otherwise make you come-a-gutsa :D
Forum: Equipment Usage, Soldering, Techniques, and Reviews 02-15-2021, 01:43 PM
Replies: 37
Views: 2,478
Posted By Per Hansson
Re: New tool to find short capacitors on motherboards : shorty with display

Thanks for posting.
I'm following your project with interest on eevblog too :)

https://www.eevblog.com/forum/testgear/finding-short-on-motherboards-with-a-shorty-(with-display)/
Forum: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals 02-15-2021, 01:40 PM
Replies: 35
Views: 876
Posted By Per Hansson
Re: Intel DQ45CB No Boot

It is unlikely to help, the capacitor is made by YC (Yang Chun) (http://capacitor.web.fc2.com/y.html#yc) series LE but I can't find a datasheet.
That said it is likely to be lower ESR than the GP...
Forum: General Electronics Technical Discussion 02-15-2021, 12:38 PM
Replies: 29
Views: 411
Posted By Per Hansson
Re: Question on AC grounding - found an old device that has me confused

Yep, the high value resistor (see posts #8 and on) makes it "sorta ok" in the old days.
It is still retarded though: because if there is a failure in the 20 cent Chinesium transformer that puts the...
Forum: General Electronics Technical Discussion 02-14-2021, 07:49 AM
Replies: 29
Views: 411
Posted By Per Hansson
Re: Question on AC grounding - found an old device that has me confused

I can not imagine this would have ever been up to code in any country in the world at any point in time.
EDIT: If you remove the heatshrink tubing from the wire that goes to the chassis is there at...
Forum: General Electronics Technical Discussion 02-14-2021, 07:31 AM
Replies: 29
Views: 411
Posted By Per Hansson
Re: Question on AC grounding - found an old device that has me confused

No, in the old days they used a wooden box, and plastic knobs.
You could never touch the metal parts which had a 50% chance of being at mains potential.
Today in modern designs this is called...
Forum: General Electronics Technical Discussion 02-14-2021, 06:37 AM
Replies: 29
Views: 411
Posted By Per Hansson
Re: Question on AC grounding - found an old device that has me confused

That's a death trap: if you reverse the AC plug the chassis will be live.
Sure in the US & UK the plug it is polarized, but it is very common to have the live and neutral reversed in the outlet....
Showing results 1 to 25 of 500

 
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