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Search: Posts Made By: Per Hansson
Forum: Other Devices with Bad Capacitors Today, 02:21 AM
Replies: 225
Views: 105,452
Posted By Per Hansson
Re: Dim Clock LCD on Jenn-Air wall oven

MAYTAG: If it's not mentioned before in the thread it might be useful to post a picture of that cap, to get rid of any confusion :)
Also is it possible to read the component designation on the PCB...
Forum: General Electronics Technical Discussion 06-17-2018, 01:18 PM
Replies: 82
Views: 1,032
Posted By Per Hansson
Re: An idiotic question about AC and shocks.

You're right, the US part was worded incorrectly.
When a split phase system is used there wont be a neutral to remove.
I never implied to say that removing the ground would change anything.
And...
Forum: General Electronics Technical Discussion 06-17-2018, 07:34 AM
Replies: 82
Views: 1,032
Posted By Per Hansson
Re: An idiotic question about AC and shocks.

I've already answered this question in my previous post.
But yes, in a two phase system without a dedicated neutral each wire would take turns being a neutral during each cycle of the sine wave.
...
Forum: Troubleshooting Game Consoles & Other Weird Devices 06-17-2018, 06:53 AM
Replies: 3
Views: 131
Posted By Per Hansson
Re: APC Smart-UPS 1000- Should I install active cooling?

The APC Smart-UPS 1500 has a fan.
It might be possible to fit the same one, as they share the same case...
Forum: General Electronics Technical Discussion 06-17-2018, 06:44 AM
Replies: 114
Views: 1,153
Posted By Per Hansson
Re: Repair Fence Energizer SS-1000E Fi-Shock

Hahaha, this was really funny! :)
The solution by stj is also good :D


Keep your meter away from high voltage devices.
The reason your meter displayed nothing is that it has a circuit that...
Forum: Troubleshooting TVs and Video Sources 06-17-2018, 06:34 AM
Replies: 11
Views: 97
Posted By Per Hansson
Forum: General Electronics Technical Discussion 06-10-2018, 02:18 AM
Replies: 82
Views: 1,032
Posted By Per Hansson
Re: An idiotic question about AC and shocks.

That YT video is good, this one is also worth watching: https://www.youtube.com/watch?v=wR6g38Pxwog

On the point of cost for GFCI outlets, I understand from your comments in the US you commonly...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-09-2018, 01:29 PM
Replies: 16
Views: 441
Posted By Per Hansson
Re: Some old 400W Akasa psu bulged caps and more

The small caps are always the most critical in a PSU.
When the wrong one fails usually in cheap power supplies you can say bye bye to your mainboard.
Forum: General Electronics Technical Discussion 06-09-2018, 01:28 PM
Replies: 82
Views: 1,032
Posted By Per Hansson
Re: An idiotic question about AC and shocks.

What you are talking about is split phase and it's 180 apart.
120 separation is used by three phase systems.
In the US that would give you √3x120v = 208v


The current flows.
It's better to...
Forum: General Electronics Technical Discussion 06-09-2018, 11:37 AM
Replies: 14
Views: 205
Posted By Per Hansson
Re: Voltage on heatsink

A standard PC power supply leaks a couple mA through the Y safety capacitors.
It would be very annoying with GFCI outlets rated at 4 to 6mA, due to the following:


Source:...
Forum: General Electronics Technical Discussion 06-09-2018, 09:02 AM
Replies: 14
Views: 205
Posted By Per Hansson
Re: Voltage on heatsink

Yea, looking through my junk bin i found a 17k resistor, it does not trip it. (~10mA)
Around 7.5k does trip it though (~20mA) but then I got tired of wiring resistors in series :D

Anyway the...
Forum: General Electronics Technical Discussion 06-09-2018, 07:30 AM
Replies: 14
Views: 205
Posted By Per Hansson
Re: Voltage on heatsink

It's a good question stj.
I've been shocked exactly like described:
By touching the metal chassis that was grounded and simultaneously the primary side heatsink that was live.
I later measured...
Forum: General Electronics Technical Discussion 06-09-2018, 04:11 AM
Replies: 82
Views: 1,032
Posted By Per Hansson
Re: An idiotic question about AC and shocks.

Of course you need a return path.
In Europe we have hot and neutral, the neutral you can touch while being grounded 99% of the time, it will be at ground potential (the other 1% of the time it's not...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-09-2018, 04:04 AM
Replies: 16
Views: 441
Posted By Per Hansson
Re: Some old 400W Akasa psu bulged caps and more

Better bring out a meter and check the voltage on the cap.
It would be unusual to use a 16v cap for 5VSB.
Forum: General Computer Discussion 06-08-2018, 08:14 AM
Replies: 190
Views: 122,511
Posted By Per Hansson
Re: Cleaning Motherboards - ATTN SMOKERS!!

To be on the safe side measure the big capacitors with a volt meter set to DC.
Sometimes they don't discharge, either because the discharge resistors are broken or none are installed...
Forum: General Computer Discussion 06-07-2018, 10:39 AM
Replies: 3
Views: 89
Posted By Per Hansson
Re: Samsung 64GB Flash Drive Got Corrupt

Depends on what filesystem was on there, there are several good tools out there.
I've had luck with these before:
https://www.runtime.org/data-recovery-software.htm
Forum: General Computer Discussion 06-06-2018, 05:54 AM
Replies: 50
Views: 917
Posted By Per Hansson
Re: 3dfx Voodoo5 glitches

You can use the Voodoo5 6000 VSA chips on a 5500 or 4500.
That's what's in the eBay link below, but the aliexpress link is for the regular VSA-100 chips used on the 5500.
...
Forum: Troubleshooting Power Supplies and Power Supply Design 06-06-2018, 05:27 AM
Replies: 13
Views: 435
Posted By Per Hansson
Re: Power supply ripple hall of shame

No, it uses a NiMH battery pack called BP190
Forum: Troubleshooting Power Supplies and Power Supply Design 06-03-2018, 05:54 AM
Replies: 16
Views: 441
Posted By Per Hansson
Re: Some old 400W Akasa psu bulged caps and more

Probably your 5vsb has gone high voltage but is being saved by that blackened zener diode on the primary side.
Replacing all electrolytic capacitors on the primary side except for the large bulk cap...
Forum: Audio Equipment Discussion 06-03-2018, 05:28 AM
Replies: 13
Views: 249
Posted By Per Hansson
Re: BEHRINGER MX-1804X Blowing Adapter fuses

http://www.paullinebarger.net/DS/S.I.%20%5bTransfull%20Limited%5d/
Forum: Troubleshooting Power Supplies and Power Supply Design 06-02-2018, 02:22 AM
Replies: 13
Views: 435
Posted By Per Hansson
Re: Power supply ripple hall of shame

Me too, thanks goes out to Fluke Sweden for it :)

Yea, here is a shot (https://www.badcaps.net/forum/attachment.php?attachmentid=177687&stc=1&d=1527927684) after recapping when it's connected up...
Forum: Soyo - Shuttle - Supermicro 05-31-2018, 11:57 AM
Replies: 17
Views: 9,452
Posted By Per Hansson
Re: No love for SuperMicro C7Q67

The attached tool can fix the DMI data on the AMI BIOS for the Supermicro C7Q67
Usage in MS-DOS as with the tool in my previous post.
It has a built in help so it's easy to understand.

amidedos...
Forum: Troubleshooting Power Supplies and Power Supply Design 05-31-2018, 06:26 AM
Replies: 16
Views: 441
Posted By Per Hansson
Re: Some old 400W Akasa psu bulged caps and more

R14A is the spot burned by the resistor, the black mark at the pad looks almost like poor contact.
Follow that trace and you will find another burned area, what's on the opposite side there?
Coming...
Forum: All Others Motherboards 05-30-2018, 02:38 PM
Replies: 6
Views: 513
Posted By Per Hansson
Forum: Soyo - Shuttle - Supermicro 05-27-2018, 03:35 PM
Replies: 17
Views: 9,452
Posted By Per Hansson
Re: No love for SuperMicro C7Q67

I fixed an identical board here (https://www.badcaps.net/forum/showthread.php?p=828763#post828763) but afterwards noticed the MAC address for NIC1 was wrong.
Instead of something sensible it was...
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