Just got another L&C.....

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  • Dan81
    SNES-powered
    • Oct 2013
    • 1865
    • Romania
    #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
    • goodpsusearch
      Badcaps Legend
      • Oct 2009
      • 2850
      • Greece
      #2
      Re: Just got another L&C.....

      Did the fan seize?

        Comment

        • Dan81
          SNES-powered
          • Oct 2013
          • 1865
          • Romania
          #3
          Re: Just got another L&C.....

          Originally posted by goodpsusearch
          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

            • goodpsusearch
              Badcaps Legend
              • Oct 2009
              • 2850
              • Greece
              #4
              Re: Just got another L&C.....

              The caps look ok. Maybe the switching transistors shorted.

                Comment

                • Dan81
                  SNES-powered
                  • Oct 2013
                  • 1865
                  • Romania
                  #5
                  Re: Just got another L&C.....

                  Originally posted by goodpsusearch
                  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

                    • goodpsusearch
                      Badcaps Legend
                      • Oct 2009
                      • 2850
                      • Greece
                      #6
                      Re: Just got another L&C.....

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

                        Comment

                        • Dan81
                          SNES-powered
                          • Oct 2013
                          • 1865
                          • Romania
                          #7
                          Re: Just got another L&C.....

                          Originally posted by goodpsusearch
                          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

                            • goodpsusearch
                              Badcaps Legend
                              • Oct 2009
                              • 2850
                              • Greece
                              #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

                                • stj
                                  Great Sage 齊天大聖
                                  • Dec 2009
                                  • 31011
                                  • Albion
                                  #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

                                    • Dan81
                                      SNES-powered
                                      • Oct 2013
                                      • 1865
                                      • Romania
                                      #10
                                      Re: Just got another L&C.....

                                      Originally posted by goodpsusearch
                                      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

                                        • stj
                                          Great Sage 齊天大聖
                                          • Dec 2009
                                          • 31011
                                          • Albion
                                          #11
                                          Re: Just got another L&C.....

                                          this area.
                                          Attached Files

                                            Comment

                                            • Dan81
                                              SNES-powered
                                              • Oct 2013
                                              • 1865
                                              • Romania
                                              #12
                                              Re: Just got another L&C.....

                                              Originally posted by stj
                                              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

                                                • stj
                                                  Great Sage 齊天大聖
                                                  • Dec 2009
                                                  • 31011
                                                  • Albion
                                                  #13
                                                  Re: Just got another L&C.....

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

                                                    Comment

                                                    • Dan81
                                                      SNES-powered
                                                      • Oct 2013
                                                      • 1865
                                                      • Romania
                                                      #14
                                                      Re: Just got another L&C.....

                                                      Originally posted by stj
                                                      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

                                                        • stj
                                                          Great Sage 齊天大聖
                                                          • Dec 2009
                                                          • 31011
                                                          • Albion
                                                          #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

                                                            • goodpsusearch
                                                              Badcaps Legend
                                                              • Oct 2009
                                                              • 2850
                                                              • Greece
                                                              #16
                                                              Re: Just got another L&C.....

                                                              Originally posted by stj
                                                              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

                                                                • Sparkey55
                                                                  Badcaps Legend
                                                                  • Jan 2010
                                                                  • 1523
                                                                  • USA
                                                                  #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

                                                                    • everell
                                                                      Badcaps Legend
                                                                      • Jan 2009
                                                                      • 1514
                                                                      • USA
                                                                      #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

                                                                        • c_hegge
                                                                          Badcaps Legend
                                                                          • Sep 2009
                                                                          • 5219
                                                                          • Australia
                                                                          #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

                                                                            • Dan81
                                                                              SNES-powered
                                                                              • Oct 2013
                                                                              • 1865
                                                                              • Romania
                                                                              #20
                                                                              Re: Just got another L&C.....

                                                                              Originally posted by c_hegge
                                                                              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

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