Bestec ATX-250 12Z problems and solutions

Collapse
X
Collapse
 
  • Page of 4
  • Time
  • Show
Clear All
new posts
Previous 1 2 3 4 template Next
  • everell
    started a topic Bestec ATX-250 12Z problems and solutions

    Bestec ATX-250 12Z problems and solutions

    I have acquired a Bestec ATX-250 12Z and thought I would start a new thread just for this model Bestec - problems and solutions.

    Don't know the full story on why this one was pulled out of service. It powered up with the following voltage readings:
    5vsb 4.99 volts
    12v 12.02 volts
    5v 4.99 volts
    3.3v 3.38 volts

    The first capacitor of the 5vsb pi filter (C36) was bulged. Also, in two areas, the glue on parts was black and brittle. Other areas of the power supply the glue was a brownish yellow. This would indicate to me that certain areas of the power supply were hotter than others - probably when the computer was powered down, the 5vsb still working, and the fan off. The 5vsb diodes were located in these two areas. A picture is worth a thousand words, so take a look at the attached picture.
    Attached Files
    Tags: None
    Previous 1 2 3 4 template Next

    Related Topics

    Collapse
    • jean luc ferre
      laptop hp g72 b52sf screen problems
      by jean luc ferre
      Hello,
      on this laptop hp g72 b52sf i have screen problems as you can see with the photo joined in attachments.
      the used graphic card is "intel hd graphics" and the id of the integrated screen is : "monitor/SEC3354".
      i verified the driver of the péripherals and they are ok. i verified the definition and settings of the graphic card and of the screen : definition 1600x900 and refreshment frequency :60hz. (they are the sames for the graphic card and the screen).
      i don't understand the reasons of the white stripe at the bottom of the screen below the task...
      06-07-2025, 03:27 PM
    • прямо
      Viper22A 5VSB circuit
      by прямо
      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...
      3 Photos
      01-13-2024, 07:05 PM
    • kotel studios
      FSP300-60GTF - no 5VSB, PS_ON; 5VSB carnage
      by kotel studios
      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?
      02-23-2025, 11:47 AM
    • Hondaman
      USB problems?
      by Hondaman
      Recently I discovered my SSD died (OCZ/Toshiba 240 GB). It was in a USB enclosure, attached to the Linksys WRT-AC1200 router. Since then I removed the USB enclosure and attached it to my Win7 PC (AMD 8150 CPU, 970 chipset, 64 GB RAM). I also gathered one or two other USB enclosures to figure out what is going on.

      (I suspect that I lost quite a few MP3 and FLAC files I recently ripped from my audio CDs, I think I lost very little un-replaceable stuff.)

      I think it is IMPOSSIBLE for Win7 to have any problems with a USB enclosure as long as Win7 knows how to speak to the...
      08-12-2024, 03:26 PM
    • clabr
      Lenovo 11e problems (any sata hdds are not recognized, sleep battery drain)
      by clabr
      Need help to solve some problems with this laptop.

      After working in bed with it one night and heating up too much (probably the cause of this problems) the sata HDD OS windows froze
      After restart the original Sata HDD was not recognized anymore (but works fine in other laptops or PCs)

      Tried connecting other good Sata 2.5 HDDs but not one is working in this laptop anymore (not the original nor others)

      Before this had happened I observed some other problems:
      When I tried replacing original mecanical HDD with a SSD HDD could not get them...
      12-02-2021, 08:09 AM
    • Loading...
    • No more items.
    Working...