Forum: General Electronics Technical Discussion
Yesterday, 05:40 AM
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Replies: 5
Views: 71
Re: What is this "processor"
Hello, please see this FAQ for how to insert photos in your posts:
https://www.badcaps.net/forum/showthread.php?t=1868
Have you checked the four discrete transistors Q1 > Q4 on the board to make...
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Forum: General Electronics Technical Discussion
Yesterday, 05:21 AM
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Replies: 19
Views: 130
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Forum: Troubleshooting Computer Displays
Yesterday, 04:31 AM
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Replies: 21
Views: 8,048
Re: Dell P2210f no power
Your photos are not usable, here is what I used instead: https://www.badcaps.net/forum/showpost.php?p=599033&postcount=30
I made one omission in my previous post: 12v does not seem to be for that...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
06-28-2022, 06:20 AM
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Replies: 1,118
Views: 184,649
Re: ESR meter upgrades
You can see a photo of the top of the encoder in my original build photo way back in this thread: https://www.badcaps.net/forum/attachment.php?attachmentid=137396&d=1468518476
Here is how the bottom...
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Forum: General Electronics Technical Discussion
06-28-2022, 04:46 AM
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Replies: 18
Views: 221
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Forum: Troubleshooting Computer Displays
06-28-2022, 02:30 AM
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Replies: 21
Views: 8,048
Re: Dell P2210f no power
I would not buy from that seller because he mixed up the type of diode in the title of the AD vs the description!
"Ultra Fast Recovery Diode" vs "Standard General Purpose"
-Typical Chinese crap,...
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Forum: Equipment Usage, Soldering, Techniques, and Reviews
06-27-2022, 12:28 PM
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Replies: 1,118
Views: 184,649
Re: ESR meter upgrades
I compiled a new build of Karl-Heinz firmware from the new GIT repository (https://github.com/kubi48/TransistorTester-source) a few days ago.
It works well on my GM328R, this time I only included a...
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Forum: Troubleshooting Computer Displays
06-27-2022, 02:54 AM
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Replies: 21
Views: 8,048
Re: Dell P2210f no power
In the original post of this thread you can find the service manual:
https://www.badcaps.net/forum/showthread.php?t=48690
I would replace both diodes with a matched pair of ultrafast diodes with...
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Forum: Troubleshooting Game Consoles & Other Weird Devices
06-27-2022, 02:15 AM
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Replies: 19
Views: 259
Re: Xbox 1.6 Motherboards and Polymer Capacitors
Well there is nothing inherently difficult with it:
You just measure the voltage on the different capacitors with the system running to see what voltage rails they are on...
For example the Pentium...
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Forum: Troubleshooting Computer Displays
06-26-2022, 11:14 AM
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Replies: 661
Views: 356,030
Re: Samsung Syncmaster 225BW
I would check the ESR of those surface mount electrolytic capacitors.
Probably after all these years with heat they are bad.
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Forum: Troubleshooting Game Consoles & Other Weird Devices
06-26-2022, 09:18 AM
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Replies: 19
Views: 259
Re: Xbox 1.6 Motherboards and Polymer Capacitors
It might be worth it to measure the voltage on those caps and if it is low enough use 2.5v 3300µF polymer caps:
They are not in old recommendations simply because they did not exist back then....
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Forum: General Electronics Technical Discussion
06-26-2022, 01:32 AM
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Replies: 18
Views: 221
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-24-2022, 11:56 AM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
I would say it is still starved for power, but you really should check the integrity of the APFC swiching mosfets (Q11/Q12 & Q1/Q3 from the schematic kaboom posted) if you do suspect that the supply...
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-24-2022, 03:50 AM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
What voltage do you read on the primary capacitor during this test?
If your line voltage is 230VAC then it should be around 230VAC x √2 = 325VDC in standby.
And when you start it up it should be...
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Forum: General Capacitor Questions & Issues
06-21-2022, 10:28 AM
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Replies: 6
Views: 197
Re: Cleaning up capacitor leakage
I would recommend cleaning using acetic acid if it leaked on the board.
Every time I do I can see bubbles and hear fizzing as I put it on the areas with leaked electrolyte, so it does a chemical...
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-21-2022, 09:52 AM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
As I explained in my previous post it will be different for each PSU design.
What works on this one will obviously not work on another with a different APFC controller and there are many of those!
...
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-20-2022, 01:35 PM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
It is disabled, but as stated in the datasheet you can't be sure it has 0% duty cycle.
It is better to desolder the OVP/EN pin as that has the sole purpose of enabling the circuit.
Every power...
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-20-2022, 08:00 AM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
Try to increase to a 120w bulb, you can of course use two parallel 60w bulbs instead...
Also note the remark in the datasheet about grounding the SS pin:
Note: In an open-loop test circuit,...
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-19-2022, 03:17 AM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
Ok, the original Samxon capacitor is fine, remember that capacitors have a +/- 20% tolerance rating...
To test the power supply without APFC you can either ground the UCC3818N APFC controller...
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Forum: Troubleshooting Audio Equipment
06-18-2022, 02:03 PM
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Replies: 87
Views: 1,607
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-18-2022, 03:14 AM
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Replies: 28
Views: 664
Re: Learning with ATX CHIEFTEC 450W PSU
45.2,14.4 (https://www.google.com/maps/place/45°12'00.0"N+14°24'00.0"E) is in the Adriatic Sea, so I would guess 230VAC on a raft between Krk and Opatija :D
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Forum: Troubleshooting Power Supplies and Power Supply Design
06-18-2022, 03:04 AM
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Replies: 54
Views: 1,612
Re: Cyberpower CP900EPFCLCD - F03 Error
Well you probably will not find that on sites like eBay, what you need is some basic electronic components.
They could even be harvested from some old PC power supply for example.
But ST also...
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