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General PSU Discussion and FAQ contributions

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    Re: General PSU Discussion and FAQ contributions

    hello yes capacitor must be change


      Re: General PSU Discussion and FAQ contributions


      The fan in my ATX PSU stopped spinning. It is clean however, not jammed, and works properly when connected directly to +12V. The PSU's type as it is printed on the PCB is FSP400-60GLY (labeled Gigabyte 460W on the outside of the casing, figures... ). When turned on, the fan spins a few times, then it stops. Unfortunately I cannot find a shematic for this model, found another for a similar one (FSP500-60GLN) on this forum, but it seems to be incomplete. Can you please give me any hint on this ?
      Thanks in advance, Peter


        Re: General PSU Discussion and FAQ contributions

        I have a Samsung Plasma (ps51d6900dm) turning on issue:- The problem is the tv turns on and gets to the logo but then turns off! tries 3 times and for safety reasons stops trying to turn the tv on i believe.
        I did a few checks and by no means am i very knowledgeable when it comes to fixing tv's but i checked all my voltages and they seem to be fine and disconnected other boards yet still came to the conclusion its the power supply.

        I then heard about heating the board with a hairdryer to see if it turns on! which it did turn on. So i isolated it to a part of the board and found when i pushed on the IC the tv stayed on when not heated. I then believed it was a cold solder joint. It worked after re soldering this area for a week! then the same problem happened again! Is this part likely to be causing this problem and if so where can i get this part as i have had no luck looking myself!

        Photo of IC i believe is faulty! in link


          Re: General PSU Discussion and FAQ contributions

          Does anyone have some tips on how to remove or clean off the white stuff that is covering a lot of the PSU components that appear either to be used for a sort of tamper proof, or to hold the components more securely?


            Re: General PSU Discussion and FAQ contributions

            Originally posted by Roving Geek View Post
            Does anyone have some tips on how to remove or clean off the white stuff that is covering a lot of the PSU components that appear either to be used for a sort of tamper proof, or to hold the components more securely?
            A lot of companies use glue to hold components in place to improve production times. If the glue is white, you can leave it (If there's a lot of it though I try to remove most) but if the glue is tan or brown, you need to remove it as it will go conductive over time. I usually remove the components covered in glue to access the glue easier for cleaning, and just heating the board helps a lot with getting it off. I use pliers too


              Re: General PSU Discussion and FAQ contributions

              Hello all, this is my first post here, so please be kind
              I have a couple of power SMPS power supplies, that are doing some wired stuff:
              one of them, the Vcc (pin 7) of the UC3842, is fluctuating, it does seem to get to 16V, since I do see the square pulse on pin 6, but it is fluctuating between 13v and 10v!!
              I have replaced the power IC, all caps and made sure all the resistors associated with this device are good. I use the light bulb to check the parts, since If I power it with the fuse in place, the rectifiers get very hot and short out...
              The second one, is, I am getting about 70v after the start up resistor!! I back tracked it,
              on a good board I have about 105v DC on the output of the bridge rectifier , but reading 155v DC on the non-working unit...if I lift the +dc output pin from the PCB, then it drops to 95v, put it back, the DC output voltage goes up to 155v dc.
              If I am not providing enough information, please excuse me, but will be more than happy to expand on what I have posted here. your help is greatly appreciated.