Tip & How-To about Microsoft Computers & Internet

How not to fix a power supply

If for some reason your computer's power supply fails, here are a few tips on what NOT to do!

  1. Don't Open it
  2. If you open it, DON'T TOUCH THE TALL ROUND THINGS
  3. If you want to know what those "Tall round things" are, they are capacitors.
  4. Power Supply capacitors hold their charge, for a very LONG time...
  5. Don't touch 'em, you'll die.
How to fix a computer power supply
  1. Take it out, don't open it, get a new one.

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1 Answer

My Samsung la46a550 will not turn on, red light flashes on and off accompanied by clicking noise every few seconds. Is this terminal??


I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.4_10_2012_9_11_51_pm.jpg

Have someone open it and look at power board for caps bad like these that are puffed up on top.

Apr 10, 2012 | Samsung Televison & Video

1 Answer

My Samsung la46a550 will not turn on, red light flashes on and off accompanied by clicking noise every few seconds. Is this terminal??


I see so many here with no sound/nopicture issues:

ISSUES:

1. IF sound main fuse/s are good.
2. If no power or standby check main fuse, standby power supply and any signsof damage you can see---burnt parts etc.
3. almost all these sets the troubleshooting involves checking voltages on the main power board to narrow down theproblem.
4. Be safe and if you do not know what you are doing don't open the set.

Answers to issues:

1. RE:fuses---if a blown fuse is found get a good replacement(not the genericones like Radio Shack). Many fuses are special even aside from amperage--Don'tput a higher rated amperage fuse in the set for any reason.

2. RE: power supply in set: if total dead aside from main fuse the set uses astandby power supply that runs 7/24 and a main supply (some are combined andsome not.

Here aside from checking fuses you want to examine all the filter caps on thepower/standby to see if any are puffed up or buldged up in some fashion--Iattach a photo of a good one---top should be silver metal and PERFECTLY flatand have no brown material coming out on top or bottom.

What happens in the standby area is they use caps with too low a voltage rating(saves money) which causes them to fail in a year or two---the standby runs7/24 and the heat dries out the caps and they fail.

3. Trouble shooting consists of the above and then at some point you have tobuy and try a board to see if it fixes it or not.

4. Safety first--no TV set is worth getting injured or even killed over.4_10_2012_9_13_09_pm.jpg
Have someone open set and look for puffed up caps like these that are bad on the power board.

Apr 10, 2012 | Samsung Televison & Video

2 Answers

power supply not coming to mother board. how can i find weather its will work or not? how can i troubleshoot ? hoping the detailed information regarding this.....


If your computer does absolutely nothing when you power it up - the fans don't turn on, no lights turn on and the the monitor screen stays dark, some component inside your personal computer has failed. Unfortunately, there are no visible fuses that you can replace. There's a good chance the power supply has failed however you need a PC power supply tester to test it. However, there are other components in your computer which could have failed and cause the computer to do nothing when you power it up. If you have the required tools, test equipment and understand how these components work you can test them and determined which component has failed. Otherwise, you need to have a computer technician determine what your problem is.
I'm sorry that I can't help you more, but repairing computers is similar to repairing automobiles . If my car will "turn over" when I turn the key on but will not start, I could replace the fuel filter, fuel pump, coil, ignition computer etc. until I found the problem, but I don't have the parts/tools, I don't know how to test automotive problems and I don't want to waste money and possibly cause more damage by just guessing. I take the car to my mechanic for repair.
If you have any additional questions contact me by clicking on the "Add a comment" link located under your problem description on FixYa. Also, if you believe that this information was helpful to you, please rate my solution using FixYa's "Solution Helpful" rating scale.
Best regards,
Yavacotech

Jun 28, 2011 | Mercury Computers & Internet

1 Answer

it keeps swtching off


Hi Anthon,

This is an indication of out-of-regulation in the power supply section. The very common caused of this fault is the dried/leaky electrolytic capacitor in that section. It will drop the supply from normal voltage and will disable the unit. Sometimes it has a bulged/dome at the top but not all, it is better that you have a capacitor checker/tester to determine its condition. Also, bad solder joints can produce the same symptom, it is hard to spot, you should use table lamp/portable lamp for finding the cold solder. Another reason of the symptoms is the open fuse/fusible resistor in series with the output of regulator IC/transistor, shorted/openRegulator IC/transistor, shorted zener diode(all are in the power supply section) and the microcontroller. Best that you check the output voltage of each regulator to determine where the fault came from and narrow the job.

If you don't have necessary tools and test instruments, and can't do the job yourself, I would advice you to look for a professional to troubleshoot the problem. Don't attempt to work in the power supply if you don't know the safety precaution of handling it, there some stored electricity enough to hurt you with a little mistake only.

Also check if your unit is under warranty /extended warranty, avail it because the manufacturer of your unit will fix it for free. Don't open the back panel, this will void the warranty.

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

May 13, 2011 | Samsung SyncMaster 540N 15" LCD Monitor

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