Shout out to all techs:Rebuild or Replace

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • tech2014
    Badcaps Veteran
    • Aug 2014
    • 807
    • Canada

    #1

    Shout out to all techs:Rebuild or Replace

    We all work with Tvs and want to provide the best service to our customers. As a business owner, I try and rationalize whether or not it is better to rebuild a board or just replace it. Finding parts is sometimes a hurdle to overcome. Ordering parts from China, and hope they are not fakes. Some boards are also hard to find, and when they are found, they are usually expensive.

    If you have a TV with shorted parts on a Ymain or Xmain, do you rebuild the board or just order a new one. When you rebuild, do you just replace the shorted components, or all of the MOSFETS and IGBTs, even if they measure ok in circuit.

  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: Shout out to all techs:Rebuild or Replace

    Depends if I can find the parts I will almost always re-build boards if I cant replace.
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • tech2014
      Badcaps Veteran
      • Aug 2014
      • 807
      • Canada

      #3
      Re: Shout out to all techs:Rebuild or Replace

      same here. When you rebuild, do you replace all the parts or just the ones that test bad in circuit.

      Comment

      • tom66
        EVs Rule
        • Apr 2011
        • 32560
        • UK

        #4
        Re: Shout out to all techs:Rebuild or Replace

        Rebuild over replace where possible, but that's not always practical or cost effective.
        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

        • Alastair E
          Chief Womble
          • Mar 2013
          • 1963
          • U.K.

          #5
          Re: Shout out to all techs:Rebuild or Replace

          I tend to rebuild where I can

          As to what gets replaced--If say, SUS_Up pair, one failed, Both get replaced--Along with SUS_Dn pair--Even if all the other three test OK.
          --These work together--so a short in say, SUS_Up would strain/damage SUS_Dn pair, so they Cant stay on the board...

          Same goes for the ever problematic ERC side of things....
          TELEFIX

          How PLASMA SCREENS WORK, X-SUS and Y-SUS what they do--
          http://www.irf.com/technical-info/appnotes/an-1088.pdf
          PLEASE DO NOT EMAIL ME PRIVATELY FOR REPAIR ADVICE. QUESTIONS BELONG ON THE FORUM!

          Comment

          • tech2014
            Badcaps Veteran
            • Aug 2014
            • 807
            • Canada

            #6
            Re: Shout out to all techs:Rebuild or Replace

            thanks guys

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #7
              Re: Shout out to all techs:Rebuild or Replace

              To add to this...I *virtually* always repair power supplies. 95% of them get repaired. They're easy to diagnose with meter, scope, light-bulb and some knowledge of operation.

              Main boards - about 25% of them get repaired. Most times repair is not practical.

              Sustain boards - about 75% of them get repaired. Sometimes repair is difficult, or the board is very cheap and repair isn't worth doing.
              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

              • vinceroger69
                Badcaps Legend
                • Mar 2012
                • 6714
                • uk

                #8
                Re: Shout out to all techs:Rebuild or Replace

                This is from another thread but the same set your working on toms advice was to replace some driver chips too not sure if you saw this thread.

                The IGBT is bad if shorted, but there may also be other IGBTs bad in the same area. Often the IGBTs are arranged in half-bridge pairs, a high and low IGBT for the sustain voltage, for example. If you find the low bad, you must replace the high, and vice versa, unless you can be certain they are all ok. It's usually simpler just to replace them.

                Also, I would always replace any driver chips which control the IGBTs, this is because in some cases the IGBTs can damage the drivers when they short. If this is the case, turning on the set with new IGBTs but old drivers would cause the new IGBTs to burn up, as they would be given incorrect gate drive.

                Comment

                • Shinju
                  Badcaps Legend
                  • Mar 2014
                  • 1239
                  • USA

                  #9
                  Re: Shout out to all techs:Rebuild or Replace

                  Mainboard repairs are my bane, I really wish I could have saved some of the ones I tossed as some of them were really hard to track down and now they are super expensive.

                  But Tom66 summed it up exactly.

                  Comment

                  • tech2014
                    Badcaps Veteran
                    • Aug 2014
                    • 807
                    • Canada

                    #10
                    Re: Shout out to all techs:Rebuild or Replace

                    I agree tom, power supplies are easy to repair. I have not had as much luck with Y or X main boards. I have been replacing the shorted parts and even all the gate drive IC, but still having boards short out again at power up. I guess it takes experience and a little luck to get it done.

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #11
                      Re: Shout out to all techs:Rebuild or Replace

                      Originally posted by tech2014
                      I agree tom, power supplies are easy to repair. I have not had as much luck with Y or X main boards. I have been replacing the shorted parts and even all the gate drive IC, but still having boards short out again at power up. I guess it takes experience and a little luck to get it done.
                      If you use a bulb you can't go too badly wrong. I had an LG 60PZ950T in for repair with a bad Z-sustain. I got the repair wrong twice, but because I used a 100W bulb in series with the Vsus path, only one IGBT went bad each time, and the rest survived, significantly reducing the cost of the repair. If I hadn't used the bulb, I'd have to replace six IGBTs every time. Also, having a scope is extremely useful.
                      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

                      • tech2014
                        Badcaps Veteran
                        • Aug 2014
                        • 807
                        • Canada

                        #12
                        Re: Shout out to all techs:Rebuild or Replace

                        I have a scope but it is only 100MHZ. I never used a bulb because I have no idea how to hook everything up and if I do it wrong I'm afraid I will destroy something lol. Are there any sites that show how to do this setup. I know how to use a bulb to test power supply but not X or Y main VS failures.

                        Comment

                        • vinceroger69
                          Badcaps Legend
                          • Mar 2012
                          • 6714
                          • uk

                          #13
                          Re: Shout out to all techs:Rebuild or Replace

                          Originally posted by tech2014
                          I have a scope but it is only 100MHZ. I never used a bulb because I have no idea how to hook everything up and if I do it wrong I'm afraid I will destroy something lol. Are there any sites that show how to do this setup. I know how to use a bulb to test power supply but not X or Y main VS failures.
                          one of toms videos showing with a bulb in series
                          https://www.youtube.com/watch?v=ROYHWY79784

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #14
                            Re: Shout out to all techs:Rebuild or Replace

                            Originally posted by tech2014
                            I have a scope but it is only 100MHZ. I never used a bulb because I have no idea how to hook everything up and if I do it wrong I'm afraid I will destroy something lol. Are there any sites that show how to do this setup. I know how to use a bulb to test power supply but not X or Y main VS failures.
                            I have a 100MHz digital scope (hacked Rigol DS1074Z) and it works fine -- actually it's perfect for plasma TVs. The maximum sustain frequency is roughly 200kHz, so even a 20MHz scope would be adequate.

                            For the bulb test, the video Vince linked is the gist of it...you just want to cut ALL the Vs lines on the connector and install the bulb in series. Or if the board has a Vs fuse, you can remove that and put the bulb across it.
                            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

                            • ReeceyBurger123
                              Never Give Up !
                              • May 2014
                              • 7325
                              • Britain

                              #15
                              Re: Shout out to all techs:Rebuild or Replace

                              Originally posted by tech2014
                              same here. When you rebuild, do you replace all the parts or just the ones that test bad in circuit.
                              If its bad caps I replace any crappy ones on the board and if its a board that I know has other faults I correct what I can on it, if its something like IGBTS only the shorted ones and possibly the drivers etc.
                              Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                              https://www.facebook.com/Telford-Tel...7894576335359/

                              Comment

                              • tech2014
                                Badcaps Veteran
                                • Aug 2014
                                • 807
                                • Canada

                                #16
                                Re: Shout out to all techs:Rebuild or Replace

                                thank you very much for all the help guys. So I just take the bulb holder power cable and splice one cable to the VS line and the other to where?

                                Comment

                                • tom66
                                  EVs Rule
                                  • Apr 2011
                                  • 32560
                                  • UK

                                  #17
                                  Re: Shout out to all techs:Rebuild or Replace

                                  Originally posted by tech2014
                                  thank you very much for all the help guys. So I just take the bulb holder power cable and splice one cable to the VS line and the other to where?
                                  To the sustain board...you're placing it in series with the Vs line of the TV. This is essentially the same as how you'd use a bulb with the AC mains, you're just using it on the plasma panel DC side instead.
                                  Note, since US bulbs are 115V rated, they may not last long at 200V DC; therefore, you may want to source 130V rough-duty bulbs or see if you can buy 230V ones somewhere.
                                  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

                                  • tech2014
                                    Badcaps Veteran
                                    • Aug 2014
                                    • 807
                                    • Canada

                                    #18
                                    Re: Shout out to all techs:Rebuild or Replace

                                    awesome. So I just have to remove the VS supply going from the power supply to the Y or X main, and install the bulb on the VS line.
                                    Last edited by tech2014; 02-20-2016, 04:39 PM.

                                    Comment

                                    • ReeceyBurger123
                                      Never Give Up !
                                      • May 2014
                                      • 7325
                                      • Britain

                                      #19
                                      Re: Shout out to all techs:Rebuild or Replace

                                      I need to get a scope but saving for a car atm and got too much on to buy one.
                                      Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

                                      https://www.facebook.com/Telford-Tel...7894576335359/

                                      Comment

                                      • michael dranfield
                                        Badcaps Veteran
                                        • Jan 2016
                                        • 232
                                        • England

                                        #20
                                        Re: Shout out to all techs:Rebuild or Replace

                                        Rebuild, theres no job satisfaction in just replacing a board , any one can do that, if a IGBT or transistor is short always replace the driver IC, a transistor can be tested , an IC cant.

                                        Comment

                                        Related Topics

                                        Collapse

                                        • Mark D
                                          Samsung UN65JU67ODFXZA Version TD01 Schematic and Parts List
                                          by Mark D
                                          The TV is a Samsung UN65JU67ODFXZA Version TD01. I replaced the power source board and the TV is now working, but I decided to try and troubleshoot the old board to fix at the component level. Trying to get a schematic and a parts list has proven to be an issue. Trying on my own, I can't tell you how many times my Norton security has flagged sites as "malicious". I ordered a service manual from ServiceManuals.net, paid $16.99 and got 66 pages of everything BUT schematics and component parts list! Can anyone steer me in the right direction? Some of the surface mounted component parts...
                                          10-29-2024, 03:15 PM
                                        • quickname
                                          Cyberpower 1500AVR UPS repair
                                          by quickname
                                          I'd like to start out by thanking this forum for providing the info to be able to repair my 15 year old CP1500AVRLCD UPS. Here is all the info I gathered during my trouble-shooting and re-capping.

                                          Like clockwork, I've had to replace the SLA batteries every 4 years. It was about that time and the UPS was acting like it needed new batteries... randomly shutting off with AC present, not being able to charge fully, and poor runtime when AC was removed. So, I replaced the batteries but noticed that it was not charging properly.

                                          I decided to verify that the batteries were...
                                          11-12-2023, 09:57 AM
                                        • SurrealMustard
                                          What parts can be salvaged from a plasma with a damaged display panel?
                                          by SurrealMustard
                                          I recently found myself the proud owner of a later-model Samsung plasma (the PN59D7000 for those keeping score at home) whose panel was, unfortunately, damaged in transport. I'm now preparing to part it out, but am curious as to whether or not any damage would have come to any of the components by attempting to power it up with the panel being broken. I read in one Avsforum thread (for whatever that's worth 😂) that the "scan driver boards" (by which I assume he means buffer boards) could be impacted by doing so. Is that actually the case? If so, since I don't intend on selling bad...
                                          03-09-2025, 08:29 PM
                                        • DynaxSC
                                          Asus Rog Strix B360-I Gaming - Parts Identification
                                          by DynaxSC
                                          Hi,

                                          I have an Asus Rog Strix B360-I Gaming with missing parts. I know there is a resistor missing for sure, but nearby it seems there might have been also a transistor or mosfet. Below the picture of the area on the board with the missing parts. The interesting area is inside the rectangle.




                                          I'd appeciate if somebody could make a detailled picture of this area from a working board and post it here. Getting the parts values would also be helpful. The revision of the board is 1.02 .

                                          Thanks in advance...
                                          08-23-2023, 07:56 AM
                                        • lorins_core
                                          BQ24800 to can it be replaced with these parts BQ24780S
                                          by lorins_core
                                          Hello to all.

                                          may I have a question about these Semiconductor parts BQ24800RUYR? can it be replaced with these parts BQ24780SRUYR?

                                          I need some good advice and also some information about it. thank you and God Bless...
                                          05-10-2024, 07:56 PM
                                        • Loading...
                                        • No more items.
                                        Working...