Re: Bestec ATX250-12E up and running!
Must wear a leisure suit to do so....
Must wear a leisure suit to do so....
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veritas odium parit -
Re: Bestec ATX250-12E up and running!
Originally posted by ToastyMust wear a leisure suit to do so....
Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
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Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
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You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Re: Bestec ATX250-12E up and running!
New layout for DM311 add on pc board. Features "McIverish" heat sink cut from tin can using tin cutter. Photos attached showing pc board attached to main heat sink.Attached FilesOld proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
Nice, clean layout! How hot does the heatsink get? How hot does the DM311 get without the heatsink?
I'm going to be building my board soon and am thinking of a glue-on MOSFET heatsink for the DM311 in addition to a tin can sink.Comment
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Re: Bestec ATX250-12E up and running!
On my boards, I have never put a heavy load on the 5vsb, so the DM311 has never been too hot for me to touch. The "tin can" heat sink was just an add on idea for future loading. I might mention ......... don't touch that heat sink while the power supply is running. It has the switching signal on it between the +320 volt source and the FET switcher, an AC signal of something like about 600 volts peak to peak. Notice also that the added heat sink does not touch the other heat sink (which is tied to AC common on this model Bestec).Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
On Bestec ATX-250 12E #2 I have completed the recap process. The first 12E had mostly JPCE-TUR capacitors. This one had mainly Jamicons. So here is an analysis of how the Jamicons held up.
The two mains were CapXon 470 uF/200 volts. I had a burned board with a pair of Panasonic 560 uF/200 volt capacitors so changed the CapXon for the better Panasonic.
12 volt rail:
C32A Jamicon 2200 uF/16V esr=.02 -> Samxon 3300 uF/16V esr=.02
C29 Jamicon 1000 uF/16V .07 -> Samxon 3300 uF/16V .02
5 volt rail:
C31 Jamicon 1000 uF/10V .10 -> Nichicon PW 2200 uF/10V .02
C30 Jamicon 2200 uF/10V 2.3 (bulging) -> Nichicon PW 2200 uF/10V .02
3.3 volt rail:
C26 Jamicon 1000 uF/10V .11 -> Nichicon PW 2200 uF/10V .03
C25 Jamicon 1000 uF/10V .09 -> Nichicon PW 2200 uF/10V .03
-12 volt rail:
C32 Jamicon 1000 uF/16V .07 -> Nichicon PW 1000 uF/16V .05
5vsb rail:
C37 Jamicon 1000 uF/10V .11 -> Nichicon PW 1000 uF/10V .05
C36 Jamicon 1000 uF/10V .10 -> Nichicon PW 1000 uF/10V .05
Remaining capacitors:
C12 Jamicon 2.2 uF/50V 2.2 -> Nichicon PW 2.2 uF/50V .50
C13 Jamicon 0.1 uF/63V 23 -> Nichicon VZ 0.1 uF/50V 18
C24 Jamicon 0.1 uF/63V 20 -> Nichicon VZ 0.1 uF/50V 17
C39 Jamicon 1 uF/50V 2.7 -> Nichicon PW 1 uF/50V 2.0
C35 Jamicon 22 uF/50V 1.2 -> Nichicon PW 22 uF/50V .45
C35A Jamicon 2.2 uF/50V 1.8 -> Nichicon 2.2 uF/50V .53
C45 Jamicon 10 uF/50V 1.5 -> Nichicon PW 10 uF/50V .51
C27 Jamicon 1 uF/50V 2.7 -> Nichicon PW 1 uF/50V 2.3
C33 Jamicon 0.47 uF/50V 7.0 -> Nichicon PW 0.47 uF/50V 3.6
C46 Jamicon 10 uF/50V 1.8 -> Nichicon PW 10 uF/50V .54
C59 Jamicon 2.2 uF/50V 2.5 -> Nichicon PW 2.2 uF/50V .52
The "critical" capacitor:
C1 Jamicon 10 uF/50V >99 (not bulging) -> not used in DM311 mod
C50 CapXon 220 uF/25V .92 -> Nichicon PW 220 uF/50V .05
Note that C50 at 25 volt rating was changed to 50 volt rating. It normally runs at 20-22 volts. If 5vsb goes up, the voltage across C50 goes up proportionatly. Not much room for overload - one of the reasons this model had high failure rate.
The esr readings of the JPCE-TUR capacitors on the first Bestec were much lower (see earlier post in this thread) than the Jamicon capacitors. The Nichicon PW had nice low readings.
Before putting it back in the box, here are some photos of this Bestec with mod and recapped.Attached FilesOld proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
Those samxon's the RS series from topcat?
Wondering how the ESR is on them. Too lazy to look up data sheets.
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Re: Bestec ATX250-12E up and running!
YesOld proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
interesting to see values for those higher voltage/lower uF caps...Remaining capacitors:
C12 Jamicon 2.2 uF/50V 2.2 -> Nichicon PW 2.2 uF/50V .50
C13 Jamicon 0.1 uF/63V 23 -> Nichicon VZ 0.1 uF/50V 18
C24 Jamicon 0.1 uF/63V 20 -> Nichicon VZ 0.1 uF/50V 17
C39 Jamicon 1 uF/50V 2.7 -> Nichicon PW 1 uF/50V 2.0
C35 Jamicon 22 uF/50V 1.2 -> Nichicon PW 22 uF/50V .45
C35A Jamicon 2.2 uF/50V 1.8 -> Nichicon 2.2 uF/50V .53
C45 Jamicon 10 uF/50V 1.5 -> Nichicon PW 10 uF/50V .51
C27 Jamicon 1 uF/50V 2.7 -> Nichicon PW 1 uF/50V 2.3
C33 Jamicon 0.47 uF/50V 7.0 -> Nichicon PW 0.47 uF/50V 3.6
C46 Jamicon 10 uF/50V 1.8 -> Nichicon PW 10 uF/50V .54
C59 Jamicon 2.2 uF/50V 2.5 -> Nichicon PW 2.2 uF/50V .52Comment
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Re: Bestec ATX250-12E up and running!
Here it is, back in the box. It has been recapped. It has the DM311 5vsb mod. It has the added fan which runs when the computer is turned off. The fan acts as a load resistance instead of resistor R102 which does nothing but generate heat.Attached FilesOld proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
AWWWW! No more frost-free standby...Originally posted by everell
veritas odium paritComment
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Re: Bestec ATX250-12E up and running!
Need that this time of year.
How does one go about hooking up said fan?Comment
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Re: Bestec ATX250-12E up and running!
The Bestec ATX-250-12E is the only psu I know of that has this circuit feature. When the computer is turned off, a transistor switches power from the pwm chip to a 1000 ohm resistor. It serves only as a heat generating load. So I remove the resistor (R102) and wire a fan in its place.
So go find you a Bestec ATX-250 12E and you can do some cool experiments!Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
>When the computer is turned off, a transistor switches power from the pwm chip to a 1000 ohm resistor. It serves only as a heat generating load.
they need that to accelerate demise of +5vstby circuit!
hehe...Comment
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Re: Bestec ATX250-12E up and running!
I had the same problem with Seventeam ST-300BLV, +5VSB raise to 9V! because of 10uF/50V CapXon KM.
after I replaced it, +5VSB is back to normal.
Thank you.
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Re: Bestec ATX250-12E up and running!
Hi,Originally posted by everell
I have also a problem with my bestec ATX-250-12Z rev C power supply.
The green component near the C40 (0,10uF/250V X2) is blown. I want to replase it, but does not know what kind of thing it is. The draw on the pc board is a resistor. But the discription is NTH8.
Can someone tell me what this is?
Thanks in advanceComment
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Re: Bestec ATX250-12E up and running!
That's most likely the inrush current limiter (NTC thermistor). I just measured one i scavenged from a psu, and it has about 45 ohms @ 25degC.
You could either get one from another broken psu, or get one from some electronics shop.Khron's Cave - Electronics - Audio - Teardowns - Mods - Repairs - Projects - Music - Rants - ShenanigansComment
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Re: Bestec ATX250-12E up and running!
check the psu first, they wont blow unless something is shorted.Comment
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Re: Bestec ATX250-12E up and running!
The marking on my Bestec ATX-250 12Z is
STK
037
As indicated in above posts, it is a thermistor used as an inrush current limiter. You can probably use one from another power supply, Before replacing, I would check resistance on bridge diodes and switching transistor. A short in either place can cause your problem.Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)Comment
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Re: Bestec ATX250-12E up and running!
Not true. I've seen them fail and the PSU is fine after replacement. Especially true if the fuse is good. Most likely they blew because of they were underrated. Someone else had one do the same and posted in here awhile ago... momaka?Originally posted by stj
Recent similar post: https://www.badcaps.net/forum/showthread.php?t=9020
Links in there for parts and specs.
Toastveritas odium paritComment
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So I have a cheap non working ATX PSU that I was learning to repair a decade ago. At the time, it blew the main fuse, bridger rectifier, NTC, and primary 9A 900V MOSFET. Replaced all except the MOSFET. 5VSB came back online. Then I poked around in it so much, measuring components one by one to a point I accidentally made the 5VSB circuit primary side went bang. Blown the AP8022 (Viper22A) PWM chip, along with a low resistance resistor and the PC817 opto isolator. I replaced them all.
In the process of poking around, I also lost a zener diode that stabilize the voltage coming from... -
Hi,
Finally replaced all of the shorted 4148's and resistors and an blown tl431 on my FSP300-60GTF after 5VSB going crazy and destroying it self. Those components also made the secondary transistors appear shorted (while in reality they weren't).
Powered it on through my dim bulb tester and they (bulbs) only flash once meaning primary caps are getting charged, but that's it. No 5VSB, PS_ON voltages.
I am sure I have replaced the components correctly and that there weren't any shorted/blown traces left.
Any ideas where to go next? -
Howdy everyone! I hope all is well where ever you are!
I'm attempting to integrate a couple of LED pods into an automotive reverse lamp circuit. The problem being, while the vehicle is running there is a 8.5v current present on the reverse lamp power wire. Needless to say is that all LED pods and lights dimly illuminate while the 8.5v is present, so the LEDs are always powered on while the vehicle is running. When the vehicle is shifted into reverse, the voltage changes to 12 volts.
I am uncertain how to convert this line into a switched 12v output line for the LED pods.... -
Oberservation:
X1 Carbon 4th Gen runs very slowly. Task manager shows the CPU running at 400 MHz.
In rare cases (1 out of 20) it runs at normal speed.
It does so when running on battery or only with the charger.
When both are connected - charger and battery (50% charged) - the system switches between charger and battery once per second.
The laptop does exactly the same thing when running Windows or Linux, so OS level problems can be ruled out.
Flashing CleanME and a different BIOS made no difference.
Intel's XTU utility...09-18-2023, 06:13 AM -
Hi all, need some help. I have a Samsung NP370E4K-KD2BR, which as a 5th Gen Intel CPU that works fine when running with the charger plugged in, but has soon as I remove it and it's running on battery the screen backlight goes off.
Tried different battery - no change
Tried different screen - no change
Removed the plastic film from the screen inverter and looked for pwm signal which as about 3.3v when running with the charger plugged in, when I take it off the voltage drops down to 2.232v, so my best guess is that the EC is not providing the correct voltage....
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