Question about NEC FORTRON/SOURCE 145W POWERSUPPLY (FSP14561GN) Power Supply

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Re: NEC FS-8001

Check for short circuit on flyback transformer 44v rail and 14.5v rail
if ok also replace C821 and R826

Posted on Jun 11, 2009

Re: NEC FS-8001

What techman is saying is replace Q802 (2sa940), check the surounding components and replace fault components if nessacery. she'll be right mate

Posted on Mar 13, 2007

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Re: NEC FS-8001

NEC is famous for under rating it seems there sets. Not sayying that the sets are not good but I've seen hundreds of NEC with what looks like over heating. I too hace seen several power supply problems and it comes to mind that a small choke that looks like a small resistor with wire wrapped around it has been the problem several times as you must also take out the parts that looks burnt and clean the area and take off all the overheated solder and clean up the pcb and reinstall and resolder with new solder if you want to not have intermittant connctions again. Oh almost forgot that these coils are on the output of the power supplys and make sure you check all the caps as well in the output of the power supplys as well as in the sweep supply as this can cause your sort of problem as well.. Good Luck PS if a resistor looks burnt they are so cheap you should replace it as resistors that look or have been overheated can and will breakdown under power or a load.

Posted on Apr 11, 2006

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I'm not sure if your unit is a laptop or tower but if it's a tower, check to see if the cooling fan in the power supply itself is running. If not, fix it. If it is, UNPLUG the unit and open up the power supply itself. This fan will find every speck of dust in your house and deposit it in every nook and cranny of any tower power supply. I cannot stress enough to unplug the unit and DO NOT use any metal tools, picks or probes and KEEP YOUR FINGERS OUT of the unit. These are usually what's called a switching supply and develope several hundred volts early in the circuit and, like the television, they have high voltage capacitors that can retain a charge even when unplugged!!! If this is the case, if you have a mini vacuum, use it to clean it out. You can also "CAREFULLY" use the hose and flat tipped upholstery attachment of a regular vacuum cleaner being careful not to move or bump any parts out of position as their positions are in some cases critical to keep the supply from radiating RF noise back into your computer or out to other appliances around the house. If worse comes to worse use a small wood or plastic handled artist's paint brush, close your eyes and blow it out. While you are rooting around in there, you may want to look for any electrolytic capacitors that have bulging tops, discolored resistors, transistors, diodes or other semiconductors and their associated heat sinks if any or the area under these parts on the circuit board itself. Any of these parts can cause the problem you describe.
I suggest this ONLY if you feel comfortable around high voltages. If not, DO NOT try this!!! Open the supply and run it until it malfunctions. When it does, take a can of compressed air like you use to clean your keyboard. Attach the enclosed tube to the spray head and give a short spray to each semiconductor one-at-a-time. Spray a part, watch to see if your function is restored. Spray another, watch again. Continue this until your unit is working again and this will be the faulty part. We used to be able to buy small cans of R-12 freon for this purpose until they found it ruined the ozone layer.
If it is a laptop, make sure your supply is not laying on a carpet, bed, pillow or any other plush surface. Make sure you have it on a flat, hard surface to allow air flow around it.
Good luck,
Jeff Mc.

Jan 28, 2011 | E-Machines (AMP23050N) 230-Watt Power...

1 Answer

Zenith TV power goes off

Hi, From what you have posted 2 possible things: 1. Cold solder - this proble is common in the power supply, vertical and horizantal circuitry. Look for any dull colored solder joints special in power components like high wattage resistor, regulator or output ICs or transistors; this problem also becomes apparent when the unit is jarred; and/or 2. Component heating up and failing - more often than not it is an active component like a power transistor or power IC that starts to fail when running after sometime (due to heat buildup) again anywhere the power, vertical, horizontal section. You would need an aeresol spray of contact cleaner to spray on the suspected component to lower its temperature when the TV starts to fail. You need to be familiar with soldering, use of a VOM, circuit analysis and component level repair to properly fix the problem. Further there are dangerous high voltages inside a TV unit even with the power off. Likewise, the unit has to be diagnosed, run, repaired and tested with the back cover off. With these in mind, you might be better off seeking the services of a qualified TV technician. Hope this gives you an idea of the problem. Pls post again how things work up your end. Good luck and kind regards.

Aug 04, 2007 | Zenith 12vDC 800mA 20W AC Adaptor A41208...

1 Answer

It´s functioning 2 hours and

Just a shot in the dark. Trace the circuit from the 440K ohm resistor. If it is a transistor or diode, using an ohm meter, check for a short between the anode / cathode ,(diode), or emitter and collector or if it a bias resistor, check for a short between the emitter and base. If it is a capacitor, check it for a short or look at the top to see if it's bulging or if it's blown off from it's rubber base. You can also check around the bottom of the circuit board for soldier splash. If another part nearby got hot or blew out, sometimes it can get hot enough to melt solder. If the fault generated a spark, it can cause the solder to actually boil and splash around the board where you don't want it.
I hope this helped.

Jan 20, 2011 | Enterasys (M8PSM-E) 450-Watt Power Supply

1 Answer

Power supply is only 12months old very little use. Was working fine but one day failed to turn on..its not overloaded its rated way,way above what my system should need. Being an auto electrician I thought...

This resistor is for overload its like a protection unit your system may Overload but you need a multimeter to test the Diodes and you might find that one of them is short this can cause the resistor to blown
you can find this resistor in High Voltage circuits
hope it will help


Nov 02, 2010 | Thermaltake 700-Watt Power Supply

1 Answer

A ups mosfet ckt one mosfet burnt out og 16 can i replace only one

Usually the mating one has been degraded or damaged as well. Replace as a pair, or all of them that are in the same function.

OFTEN driver transistors and drive diodes are also damaged. Carefully check all associated components to avoid burning out freshly replaced ones.

Mar 14, 2010 | Vector VEC 024 400-Watt Power Inverter...

2 Answers

Blown fuse everytime it powers on

yes right there is a short circuit in power supply if you are non technical then replace the power supply if you are technical then open the power supply and check the 4diodes of bridge if faulty replace it again check transistor attatched to heat sink if faulty repalce it

Feb 28, 2010 | Pyramid (PS36KX) 600-Watt Power Supply

1 Answer


I would also have liked to have had a schematic diagram for my ECHOSTAR 450w ATX power supply.

Not having one though, I have replaced two capacitors (one with a bulging top) and another with a leaking top, three rectifiers (two shorted and the third had a cracked case), and have ordered transistor Q1 (also shorted). Will also need to repair trace damage on the bottom of the circuit board. Other components check out OK so I hope it will be working again after the transistor arrives Monday. I need the -5v this one supplies to get my old computer running so I can retrieve last year's tax info.

Jan 17, 2010 | Echo Star 450W 450 Watts ATX Power Supply,...

1 Answer

Burnt out resistor near coils on bestec atx-300-123 rev.c2 no diagram so don't know the value of the resistor.any ideas?

First of all, it is very unlikely that a resistor "burns out" for being defective itself. Usually they are designed to run around 50% of their rated wattag. So they can get hot to the touch but are not over stressed. Therefore, it is more likely that you have something else that caused excessive current to go thru he resistor. So the point is that you can replace the resistor and more than likely it will fail again. You should start with a schematice of the circuit and look for components that could fail in a shorted condition and therefore cause excessive current to go thru the resistor. A schematic will tell you the value of the resistor. I am guessing that it is on a PC board and is therefore "surface mount" style. Look for defects in the board trace causing shorts. A good place to start. Hope you find it. Lots of Luck.

Oct 30, 2009 | E-Machines Bestec ATX-300-12E Rev. D 300w...

1 Answer

ATX-300GU PSU: 32V around Q4/Q5 circuit

could just be the regulating power transistors are burned out or one of their biosing components, there a few meaty capacitors that may be causing a surge, but the safe thing to do would be to start with a new one, the reason is, modern drives are so sensitive that you could blow their circuitry and then lose the harddisk! All the best - the Yeti

May 17, 2009 | AOpen Power Supply: ATX-300GU (PS4300GU)...

1 Answer

Burnt out

If you are technically savvy, you could check for poofed components in the power supply. Possible bad parts include fuse, switching transistor(s), small resistors, and other components. Sometimes when one component fails, it will take some others with it, depending on the circuit design, and exactly how & what blows up. Electrolytic capacitors often ooze a bit, or bulge when they fail. If you see one like that, it should be replaced as part of the repair.

Mar 31, 2007 | RaidMax Aurora RX580 (RX580F) 580-Watt...

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