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Neon C3298DVB stuck in standby

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    #41
    Re: Neon C3298DVB stuck in standby

    Originally posted by sienoki View Post
    A pic ok underside psu
    Heres 1 with wires attached..not sure which 1s 2 put a jumper on..thx
    Attached Files

    Comment


      #42
      Re: Neon C3298DVB stuck in standby

      Originally posted by sienoki View Post
      Heres 1 with wires attached..not sure which 1s 2 put a jumper on..thx
      I took a reading on the big cap & got 230 on the ac/dc meter & 0 when switched off..the big heat shield also measured that?..is it supposed 2 measure that..thx
      Attached Files

      Comment


        #43
        Re: Neon C3298DVB stuck in standby

        primary side heatsinks will normally be at line voltage so 230v will be on the heatsink,but your large filter cap should be around 320-340v if the pfc front end is working when tv is powerd on.

        disconnect main board,jumper 5v to on/off pin,do other voltages come up?,the 12v to main board,and 24v to inverter?something i think on the main board is putting the psu in to protection.
        fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

        ----------------------------------------------
        please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

        Comment


          #44
          Re: Neon C3298DVB stuck in standby

          Originally posted by multimeter View Post
          primary side heatsinks will normally be at line voltage so 230v will be on the heatsink,but your large filter cap should be around 320-340v if the pfc front end is working when tv is powerd on.

          disconnect main board,jumper 5v to on/off pin,do other voltages come up?,the 12v to main board,and 24v to inverter?something i think on the main board is putting the psu in to protection.
          I jumpered the 5v from the stnby pin to on/off pin & still no other voltages..i will get some pics off main board both sides when ive some time off work..thx

          Comment


            #45
            Re: Neon C3298DVB stuck in standby

            Originally posted by sienoki View Post
            I jumpered the 5v from the stnby pin to on/off pin & still no other voltages..i will get some pics off main board both sides when ive some time off work..thx
            I jumped them pins with nowt connected 2 mainboard & 12v/24v appeared..sorry 4 not doing correct 1st time..some pics of mainboard..if you need underside let me know..theres no smd devices on the underside..thx
            Attached Files

            Comment


              #46
              Re: Neon C3298DVB stuck in standby

              check the fuse ive marked in red,this problem is either a corrupt new eeprom flash that you put in,or the crystal to the cpu has failed or the cpu has failed both of these are under the large sheild ,your power supply seems fine.

              check that fuse

              if fuse good,take resistance reading on the connector pins of the mainboard(the one where the power comes from the psu),just the ones that are marked with a voltage,the readings should be very high resistance,if they are low ie about 30 ish ohms,then it points to a short on that rail which will need investigating.


              if all good then you will need to take off that large sheild and look up the datasheet for the cpu ic,confirm what the voltage into the cpu is and what pin it is,and then test that pin to see if the correct voltage is there,if you dont have a scope then you wont be able to test the crystal,it should show a steady sine wave on a scope.
              Attached Files
              fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

              ----------------------------------------------
              please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

              Comment


                #47
                Re: Neon C3298DVB stuck in standby

                also,now you have everything disconnected,plug connectors in one at a time,whilst jumping 5v to on,and monitor the voltages if they dissapear again then what ever you plugged in may have a short on it,im positive more or less its the main board though
                fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                ----------------------------------------------
                please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                Comment


                  #48
                  Re: Neon C3298DVB stuck in standby

                  Originally posted by multimeter View Post
                  also,now you have everything disconnected,plug connectors in one at a time,whilst jumping 5v to on,and monitor the voltages if they dissapear again then what ever you plugged in may have a short on it,im positive more or less its the main board though
                  Fuse tested ok..do i black probe screw chassis n red probe power i pins on mainboard on continuity setting?
                  Took the shield off & cant seem to find any info on the ic..thx
                  Attached Files

                  Comment


                    #49
                    Re: Neon C3298DVB stuck in standby

                    Originally posted by sienoki View Post
                    Fuse tested ok..do i black probe screw chassis n red probe power i pins on mainboard on continuity setting?
                    Took the shield off & cant seem to find any info on the ic..thx
                    for dc voltage testing with power on,dc setting 20v 0n multimeter,black on chassis screw,red on individual out pins on connector.

                    for resistance /fuse testing power off,either on 200 ohm range or diode test function for continuity.

                    you will need to remove the heat sink on the cpu chip,should just twist off gently,you will need to get some thermal bonding glue to put back on ,both surfaces must be spotless and dry,use isopropynal alcohol.

                    the ic will have its part number under the heatsink.
                    fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                    ----------------------------------------------
                    please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                    Comment


                      #50
                      Re: Neon C3298DVB stuck in standby

                      on u6 the flash chip you replaced,did you not use flux(no clean)?,those pins look a bit shaky,id have a check for continuity on each pin,find a nearby solder pad that connects to each pin and check they have continuity,do for every pin.pin 7 dosent look like its on its pad properly,or its the picture,not sure.
                      Last edited by multimeter; 08-18-2012, 08:21 AM.
                      fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                      ----------------------------------------------
                      please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                      Comment


                        #51
                        Re: Neon C3298DVB stuck in standby

                        Originally posted by multimeter View Post
                        on u6 the flash chip you replaced,did you not use flux(no clean)?,those pins look a bit shaky,id have a check for continuity on each pin,find a nearby solder pad that connects to each pin and check they have continuity,do for every pin.pin 7 dosent look like its on its pad properly,or its the picture,not sure.
                        Hey up fella..thx again for sticking by me..with the jumper pin in place & everything connected up & switched on i get
                        5.09v
                        5.09v
                        5.09v
                        5.09v
                        12.07v
                        12.07v
                        on the main power pins from the mainboard
                        I used non clean flux for the eeprom..i looked over chip with jewellers eye n they look fine..it looks better under scope..gonna do them other readings now..thx

                        Comment


                          #52
                          Re: Neon C3298DVB stuck in standby

                          Originally posted by sienoki View Post
                          Hey up fella..thx again for sticking by me..with the jumper pin in place & everything connected up & switched on i get
                          5.09v
                          5.09v
                          5.09v
                          5.09v
                          12.07v
                          12.07v
                          on the main power pins from the mainboard
                          I used non clean flux for the eeprom..i looked over chip with jewellers eye n they look fine..it looks better under scope..gonna do them other readings now..thx
                          Cant get that heat sink off its stuck solid

                          Comment


                            #53
                            Re: Neon C3298DVB stuck in standby

                            Originally posted by sienoki View Post
                            Cant get that heat sink off its stuck solid
                            I dont think this board is repairable & it dont look like theres 1 about at the moment..the screen is a samsung LTA320AP02..will this screen be compatible with most 32" lcds?

                            Comment


                              #54
                              Re: Neon C3298DVB stuck in standby

                              Originally posted by sienoki View Post
                              I dont think this board is repairable & it dont look like theres 1 about at the moment..the screen is a samsung LTA320AP02..will this screen be compatible with most 32" lcds?
                              Only with TVs using Samsung panels.
                              Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
                              For service manual, schematic, boardview (board view), datasheet, cad - use our search.

                              Comment


                                #55
                                Re: Neon C3298DVB stuck in standby

                                Originally posted by multimeter View Post
                                on u6 the flash chip you replaced,did you not use flux(no clean)?,those pins look a bit shaky,id have a check for continuity on each pin,find a nearby solder pad that connects to each pin and check they have continuity,do for every pin.pin 7 dosent look like its on its pad properly,or its the picture,not sure.
                                Got the heatsink off
                                MSD106CL-LF-Z1
                                A6MFN29J
                                0933B

                                Comment


                                  #56
                                  Re: Neon C3298DVB stuck in standby

                                  Originally posted by sienoki View Post
                                  Got the heatsink off
                                  MSD106CL-LF-Z1
                                  A6MFN29J
                                  0933B
                                  ok,cant find any info on this chip no datasheet,would have been good to find VCC to at least see if the chip is getting its voltage,if you have a scope ,we could see if the crystal is working,it should show a stable sine wave.very rare these fail though.

                                  there are a couple of voltage regulators on this board,prefixed "bm" you could check those and see if they are working,but if they work through the main cpu they may not activate until the cpu sends the correct signal.

                                  the voltages you had taken are correct and within spec,you can rule out the psu.

                                  hopefullly someone might pipe in and show a link to a datasheet for the chip.but i cant find one.

                                  if no joy i would keep an eye out for a mainboard on ebay or elsewhere you may get lucky
                                  fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                                  ----------------------------------------------
                                  please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                                  Comment


                                    #57
                                    Re: Neon C3298DVB stuck in standby

                                    by the way did you follow the steps in post#46 about resistance testing on the disconnected main board?if you havent...

                                    set your meter to 20k,black probe to chassis screw,red probe to each individual line voltage pin (no need to do the ground pins),coming into the main board from the psu,the readings should be very high resistance anything around 30ohms indicates a short on that rail.

                                    the main board has a short somewhere that is shutting the psu down,confirmed by jumping the pins as you did with nothing connected,if you find the rail thats shorted,you can trace along and check components along the trace thats affected,(leakseeker would be good for this)
                                    fixed so far...376 lg lcd tv's,24 onn tv;s,24 panasonic lcd,16 jvc lcd,12 marshall jcm800 amps,refurb of various disco equipment lighting,old style disco decks ,and a flymo!

                                    ----------------------------------------------
                                    please let us know if everything works ok if your tv gets fixed, as it will be and aid for anyone else having the same problem and wishing to fix it.it would save people clogging up this site with topics that are duplicated,and can be found easily using the search function.,and taking up valuable space.enjoy your fixed tv!,hopefully!

                                    Comment


                                      #58
                                      Re: Neon C3298DVB stuck in standby

                                      Originally posted by sienoki View Post
                                      Fuse tested ok..do i black probe screw chassis n red probe power i pins on mainboard on continuity setting?
                                      Took the shield off & cant seem to find any info on the ic..thx
                                      Took 20k setting readings on the power in pins & the 2 5vins pins were a reading of 0.28..the others were high..this was done with nothing plugged into the mainboard nothing jumpered & not switched on..thx

                                      Comment


                                        #59
                                        Re: Neon C3298DVB stuck in standby

                                        Originally posted by sienoki View Post
                                        I jumped them pins with nowt connected 2 mainboard & 12v/24v appeared..sorry 4 not doing correct 1st time..some pics of mainboard..if you need underside let me know..theres no smd devices on the underside..thx
                                        Took readings of the vdo,s in pic 3 post45 the 1s closest to the power pins & only got the correct voltages with the jumper in..so can i rule them 4 vdos out?
                                        All the vdos give correct voltages with only the jumper pin inplace
                                        Last edited by sienoki; 08-18-2012, 02:05 PM.

                                        Comment


                                          #60
                                          Re: Neon C3298DVB stuck in standby

                                          Originally posted by sienoki View Post
                                          Took readings of the vdo,s in pic 3 post45 the 1s closest to the power pins & only got the correct voltages with the jumper in..so can i rule them 4 vdos out?
                                          All the vdos give correct voltages with only the jumper pin inplace
                                          So could the fault perhaps be something with the 2 5vins with only having 0.28..so something on them rails?https://www.badcaps.net/forum/attach...6&d=1345298168

                                          Comment

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