1. Home
  2. Electronics Repair
  3. Computer PSU Powerman ATX-250GTA Schematic?

Computer PSU Powerman ATX-250GTA Schematic?

This is an SPI power supply (powerman branded), I need the values to two resistors which have burned out. They are located in the right front corner near the corner mounting screw. One is flesh pink, the other green. They are 1 watt carbon or metal film resistors. The only bands I can make out on the pink are black and red (brown?) located on either end. On the green one, the bands are red (brown)/black/red (brown)/gold (Difficult to tell difference between the red and browns). Is there a place where the schematic can be found, or someone otherwise advise as to the values? I can get the identifiers, but don't have them handy right now.

The resistors are not destroyed, the leads have corroded off them. I can take readings and I get 6.8 ohms for the pink and 148.5 ohms for the green. Does this tell me anything?

Reply to
rubenz1967
Loading thread data ...

On 3 May 2006 06:25:08 -0700, snipped-for-privacy@hotmail.com put finger to keyboard and composed:

6.8 and 150 are preferred values.

- Franc Zabkar

--
Please remove one 'i' from my address when replying by email.
Reply to
Franc Zabkar

The power supply, Powerman ATX-250GTA, failed. It is now only showing power on the 3.3V rail, no 5V or 12V. This power supply is apparently made by SPI (Sparkle) and was sold under a number of different brands (ie AOpen), usually with the same model number. Upon inspection, three

3300uf/10V capacitors are leaking topside. R47 (green resistor currently registering 148.5ohm) and R48 (pink resistor currently registering 6.8ohm) each had one leg of their leads corroded off. You can see the caps and resistors here:

formatting link

or here:

formatting link
formatting link

The burn hole is at R48 (pink resistor). The trace has lifted for about .25" on the bottomside. The only remaining bands on this resistor are what appear to be red (but could be brown) and black at the extreme ends. Inner bands are faded. The green resistor has red (again, maybe brown), black, red, and gold. I'm not familiar enough with resistors to know whether they are carbon or metal film (I'm leaning towards carbon) and their dimensions seem to indicate they are

1W.
Reply to
rubenz1967

Do yourself a favour and bin it. Buy a nice shiny new 400watt+ supply for a few pounds/dollars/euros and have relative peace of mind. You will need to replace all the electrolytics and isolate any other faults to get it back working again, and you'll still have a crap, old, low power PSU which will run hot and cook new parts like it has already done, possibly risking your PC's components if the regulation fails.

Dave

Reply to
Dave D

See

formatting link

I discovered three of these beasts inside my PC PSU, by chance. I'd opened the PSU to change the fan (which was getting noisy) and just caught sight of them hidden down in the cabling mess!

"YEC" branded 3300uf/10v capacitors, bulging tops, and brown crusty stuff on the top. Removed and replaced with some new Panasonics. If you replace the capacitors, make sure you get 105'C temperature rated, low ESR caps that are designed for switch mode use.

If it's to the point where traces are being eaten off, then really do consider a new PSU!

Mike.

--
--------------------------------------+------------------------------------
Mike Brown: mjb[at]pootle.demon.co.uk | http://www.pootle.demon.co.uk/
Reply to
Mike

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.