Question about Dell - NPS-200PB-73M (NPS200PB73M) Power Supply

8 Answers

Pc won't turn on

Emachine 410. was left on all day, when i returned i found that pc had switched itself off. when i tried to turn it back on the three lights on keyboard, num lock, cap lock and scroll lock all on and the machine made a funny noise and won't switch on.

Posted by helsy on

  • 4 more comments 
  • nebula Nov 05, 2007

    I have similar problem but I have S12 650 W? The PC was running trough the night but at the morning was out and wouldn't start.Well the led on the motherboard is on when I turn it. I've checked with multimeter and I get some random values.
    I'm not an expert and do not know how exactly to check with a meter.
    Can I assume that the power supply is operational and the problem is somewhere else? 

  • immc2u Nov 22, 2007

    The power supply has a blinking green light but wont turn on?

  • filbert1283 Dec 20, 2007

    a friend of mine has an emachine w288 and is in need of a wireing diagram so he can fix the nightmare his mother in law created can someone help please

  • FIX-IT_EE Jan 02, 2008

    Same problem. My sons PC was on all night an he noticed several days later when he tried to use it it would not turn on.

    I removed the power supply and tried to power it externally but to no avail. I checked the fuse which was still fine.

    Does the power supply have some feed back from the mother board in order to start up via one of the harness cables?

  • FIX-IT_EE Jan 10, 2008

    Hello there,

    Not sure if you made any headway into resolving your problem but I have the same issue on my T2862.

    PSU was dead not volateg on any connector not fans spinning. Put in a known good PSU (tested it externally by shorting green to black wire of 20 pin connector). All voltages were present and PSU fan spun. Inserted PSU into suspect Mobo and got green LED lit, only CPU fan spun immediately. Pressed power switch on CPU with no change. Measured voltage on the power cables going to CDROM and HDD. +12V measured ~+6V and 5V measured about +2.5V. My conclusion was PSU is loaded down some how. I also noticed that the rear fan tried to spin but my thoughts are since the 12V source it not nominal fan cannot start. I began removing all pluggable components off any power or cables (CDROM, HDD, DDR, Network Card and audio, Keyboard and Mouse). No significant change to voltage. Last part was the CPU itself. I removed this as well to no avail.

    I am now out of ideas other then try to find a new mobo (which identical ones are not being made anymore), or try to see if Bios set default could have been messed upto to prevent a PSU from coming up to what appears is a half the nominal voltages.

    If I get another mobo it will not be useable with my recovery disk since it is different then when made by emachine. These emchines have a bad wrap from what I read. However the mobo is an intel made design. The Bestec PSU that was in there seems perhaps at fault to start this bad chain of events.

    If anyone out there has had any luck with fixing the mobo I am all ears.

    Ted

  • manixdvo Jan 31, 2008

    Good day,



    I also have lots of PS lc-250ATX models, and they also have the same problems i guess. mostly were the capacitors and did tried to change all the bad capacitors yet still no power when pressing the power botton, but if i short the green wire to the black wire , its working. anybody knows what realy is the problem to this power supply model?



    tnx





    ManiX

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8 Answers

Anonymous

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Same problem. My sons PC was on all night an he noticed several days later when he tried to use it it would not turn on.
I removed the power supply and tried to power it externally but to no avail. I checked the fuse which was still fine.
Does the power supply have some feed back from the mother board in order to start up via one of the harness cables?


emachine 410. was left on all day, when i returned i found that pc had switched itself off. when i tried to turn it back on the three lights on keyboard, num lock, cap lock and scroll lock all on and the machine made a funny noise and won't switch on.

Posted on Feb 23, 2008

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Anonymous

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I just learned, the hard way of course, that Bestec power supplies, especially the 250w model supplied with desktops by eMachines and some from HP, frequently blow out the motherboard when they fail. Try googling "bestec power supply fail emachines motherboard" (without quotes). No real useful suggestions there, just a lot of ranting about how eMachines and Bestec are crummy, but it gives you an idea of how prevalent this problem is.

Posted on Jan 06, 2008

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Anonymous

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Power supply failures are very common due to cheap components. PS testers are cheap ( about $5 ) and available on eBay as well as component suppliers. There are many different voltages and connectors coming out of the supply and if any of them are bad your computer may not power up. The testor may show all lines good when the MB connector is plugged in but when you put a load on it ( plug in another connector like the 4 prong drive supply line ) it will fail. There is also a "power good" line on the 20 - 24 pin MB supply that will not allow the MB to power up if values are not in an acceptable range. I recently had a late model Dell Dimension that would not start and the supply tested good with the 24 pin MB connector plugged in - Drive connector plugged in, still good - p4 connector plugged in and bingo - failuire! Replaced the PS supply and all good! Point being that while PS problems are only one of many that may cause a no boot situation, it is the most common and not always obvious.

Posted on Jan 04, 2008

Anonymous

Remove capacitors, big one

Posted on Dec 15, 2007

Anonymous

I sorted the problem and thanks to all that replied. I've bought a new PC! Easily solved.

Posted on Nov 04, 2007

Jonathan

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My power supply failed i started tinkerin around with it and found that the connector that goes to the board from the swich, one of the wires where half way pulled out. Found it when i stuck the ohm meter in the back of the conector and it sparked. unpluged it then pushed the wire back into its connector. Pluged the power supply back into the wall Jumped the Green wire to a black ground "all blacks are ground" fired right up

Posted on Oct 23, 2007

Anonymous

You don't need anything except a 300 watt power supply thts all

Posted on Sep 08, 2007

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Hi, Are you able to test or repair some of this your self? is so use a multimeter and check the power supply,If you get no reading then remove the unit and open the cover, on the printed circut you will find a fuse either glass or ceramic. Replace this and also clean all dust from the unit replace the cover and reinstall in computer. If this fails you may need a new power supply unit. Regards mistyman

Posted on Sep 08, 2007

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