Announcement

Collapse
No announcement yet.

Just got another L&C.....

Collapse
X
Collapse
 
  • Page of 2
  • Filter
  • Time
  • Show
Clear All
new posts
Previous 1 2 template Next
    #1

    Just got another L&C.....

    ...and it blew.

    Fuse blew when I plugged it in,and it also TRIPPED. Few sparks went like 4th of July's fireworks.

    PSU is ANS LC-B350ATX. Has voltage selector (set to 230V btw),chip of the year 2003,diodes on a bracket,our usual 4 diode treatment ,all the signs of a PSU worse than Powmax.

    Strange thing is the fan is a Ruilian Science RDM8025SA. IIRC Deer/L&C love using Globe Fans,so this is quite weird.

    Also,have a laugh at the output it claims:

    3.3V - 28A
    5V - 35A
    +12V - 16A
    -12V - 0.8A
    -5V - 0.3A
    +5VSB - 2A


    A shot of the carnaige. Look at the blown fuse . It has a bit of copper wire underneath it for a reason I really don't understand.

    Attached Files
    Main rig:
    Gigabyte B75M-D3H
    Core i5-3470 3.60GHz
    Gigabyte Geforce GTX650 1GB GDDR5
    16GB DDR3-1600
    Samsung SH-224AB DVD-RW
    FSP Bluestorm II 500W (recapped)
    120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
    Delux MG760 case
    Tags: None
    #2
    Re: Just got another L&C.....

    Did the fan seize?

    Comment

      #3
      Re: Just got another L&C.....

      Originally posted by goodpsusearch View Post
      Did the fan seize?
      No. Entire PSU was brand new,with very light dust.
      Main rig:
      Gigabyte B75M-D3H
      Core i5-3470 3.60GHz
      Gigabyte Geforce GTX650 1GB GDDR5
      16GB DDR3-1600
      Samsung SH-224AB DVD-RW
      FSP Bluestorm II 500W (recapped)
      120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
      Delux MG760 case

      Comment

        #4
        Re: Just got another L&C.....

        The caps look ok. Maybe the switching transistors shorted.

        Comment

          #5
          Re: Just got another L&C.....

          Originally posted by goodpsusearch View Post
          The caps look ok. Maybe the switching transistors shorted.
          I don't think it's that either. I've had a Premier like this one with the switching transistors shorted and it wouldn't turn on at all. Just a fan twitch and that was all.

          I'd say the 5A fuse it has would have been bad itself,but not sure about that.

          Also,I checked the green thingy next to it (does anyone know what is it?) and it's cracked.
          Main rig:
          Gigabyte B75M-D3H
          Core i5-3470 3.60GHz
          Gigabyte Geforce GTX650 1GB GDDR5
          16GB DDR3-1600
          Samsung SH-224AB DVD-RW
          FSP Bluestorm II 500W (recapped)
          120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
          Delux MG760 case

          Comment

            #6
            Re: Just got another L&C.....

            THE ntc thermistor. If it cracks it indicates something is shorted.

            Comment

              #7
              Re: Just got another L&C.....

              Originally posted by goodpsusearch View Post
              THE ntc thermistor. If it cracks it indicates something is shorted.
              Well,what can I do then? Replace the fuse and the thermistor? Or replace both and then proceed with replacing the switching transistors (guess they're the ones on the heatsink next to the primary caps)?
              Main rig:
              Gigabyte B75M-D3H
              Core i5-3470 3.60GHz
              Gigabyte Geforce GTX650 1GB GDDR5
              16GB DDR3-1600
              Samsung SH-224AB DVD-RW
              FSP Bluestorm II 500W (recapped)
              120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
              Delux MG760 case

              Comment

                #8
                Re: Just got another L&C.....

                Before replacing the fuse, check with the diode mode of your multimeter the 4 diodes, the 2 switching transistors, the 5vsb transistor and anything else that could have gone bad. The 2003 IC could be bad too. Check it and if most of its pins look shorted then you can assume it is bad.

                Also check the underside of PCB and post a photo of the soldering.

                Comment

                  #9
                  Re: Just got another L&C.....

                  primary side of the standby is blown, look between the standby transformer & heatsink!

                  btw, that foto is a good demonstration of why we are supposed to use ceramic fuses on psu's!
                  Last edited by stj; 03-29-2015, 06:04 AM.

                  Comment

                    #10
                    Re: Just got another L&C.....

                    Originally posted by goodpsusearch View Post
                    Before replacing the fuse, check with the diode mode of your multimeter the 4 diodes, the 2 switching transistors, the 5vsb transistor and anything else that could have gone bad. The 2003 IC could be bad too. Check it and if most of its pins look shorted then you can assume it is bad.

                    Also check the underside of PCB and post a photo of the soldering.
                    Checked the underside of the PCB. No burn marks on the underside.

                    Now,more pics as you asked:

                    Replaced fuse and NTC thermistor


                    Replaced 2N60A transistor w/ thermal pad


                    Solder side (brown stuff is lots of rosin core I used)


                    The transistor w/thermal pad and NTC thermistor came from a Codegen 200X 350W PSU I discarded.
                    Attached Files
                    Last edited by Dan81; 03-29-2015, 12:04 PM.
                    Main rig:
                    Gigabyte B75M-D3H
                    Core i5-3470 3.60GHz
                    Gigabyte Geforce GTX650 1GB GDDR5
                    16GB DDR3-1600
                    Samsung SH-224AB DVD-RW
                    FSP Bluestorm II 500W (recapped)
                    120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                    Delux MG760 case

                    Comment

                      #11
                      Re: Just got another L&C.....

                      this area.
                      Attached Files

                      Comment

                        #12
                        Re: Just got another L&C.....

                        Originally posted by stj View Post
                        this area.
                        What's with it? It just seems darkened but that's it.

                        Do you mean I should replace the diode and the blue cap?
                        Last edited by Dan81; 03-29-2015, 01:06 PM.
                        Main rig:
                        Gigabyte B75M-D3H
                        Core i5-3470 3.60GHz
                        Gigabyte Geforce GTX650 1GB GDDR5
                        16GB DDR3-1600
                        Samsung SH-224AB DVD-RW
                        FSP Bluestorm II 500W (recapped)
                        120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                        Delux MG760 case

                        Comment

                          #13
                          Re: Just got another L&C.....

                          something has sparked and blown away part of the resistor leg!!

                          Comment

                            #14
                            Re: Just got another L&C.....

                            Originally posted by stj View Post
                            something has sparked and blown away part of the resistor leg!!
                            Okay...any ideas what value was it?
                            Last edited by Dan81; 03-29-2015, 01:25 PM.
                            Main rig:
                            Gigabyte B75M-D3H
                            Core i5-3470 3.60GHz
                            Gigabyte Geforce GTX650 1GB GDDR5
                            16GB DDR3-1600
                            Samsung SH-224AB DVD-RW
                            FSP Bluestorm II 500W (recapped)
                            120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                            Delux MG760 case

                            Comment

                              #15
                              Re: Just got another L&C.....

                              that's not the point, yuo need to find out what it sparked to/from and test every part related to that circuit.

                              Comment

                                #16
                                Re: Just got another L&C.....

                                Originally posted by stj View Post
                                that's not the point, yuo need to find out what it sparked to/from and test every part related to that circuit.
                                +1

                                In cases like that you need to check everything or else it will blow again when you connect it to mains.

                                Comment

                                  #17
                                  Re: Just got another L&C.....

                                  You need to use a dim bulb tester in line with the power input side just incase of a short circuit still exists.

                                  Comment

                                    #18
                                    Re: Just got another L&C.....

                                    The three components stj circled are the snubber circuit (diode, capacitor, and resistor). From the picture of the bottom of the pc board, it looks like one of the legs of the capacitor is not well soldered.

                                    Check that diode. If it is shorted it can cause these symptoms. Sometimes the manufacturer uses a 1N4007 diode which is a slow poke at these frequencies. So they tend to short over time. A lot of these cheap power supplies use a FR107 diode (FR meaning fast recovery) and are OK for this circuit.
                                    Old proverb say.........If you shoot at nothing, you will hit nothing (George Henry 10-14-11)

                                    Comment

                                      #19
                                      Re: Just got another L&C.....

                                      That thing can not deliver a single watt of power in spec and is nothing but a poorly built motherboard and HDD killer. The only thing that will improve that PSU is a sledgehammer.
                                      I love putting bad caps and flat batteries in fire and watching them explode!!

                                      No wonder it doesn't work! You installed the jumper wires backwards

                                      Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium

                                      Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 Pro

                                      Comment

                                        #20
                                        Re: Just got another L&C.....

                                        Originally posted by c_hegge View Post
                                        That thing can not deliver a single watt of power in spec.
                                        Because of missing PI coils? If so I added them to the board.

                                        Also just because a PSU is bad it doesn't mean it can't be improved.
                                        Last edited by Dan81; 03-30-2015, 05:47 AM.
                                        Main rig:
                                        Gigabyte B75M-D3H
                                        Core i5-3470 3.60GHz
                                        Gigabyte Geforce GTX650 1GB GDDR5
                                        16GB DDR3-1600
                                        Samsung SH-224AB DVD-RW
                                        FSP Bluestorm II 500W (recapped)
                                        120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
                                        Delux MG760 case

                                        Comment

                                        Previous 1 2 template Next
                                        Working...
                                        X