2 Seconds to Black - Gateway LE1936

Collapse
X
Collapse
+ More Options
Posts
 
  • Time
  • Show
Clear All
new posts
  • budm
    Badcaps Legend
    • Feb 2010
    • 40746
    • USA

    #21
    Re: 2 Seconds to Black - Gateway LE1936

    From post 16 on this thread:
    https://www.badcaps.net/forum/showthread.php?t=7777
    It does look like you do have bad transformer. But do the lamp test first.
    Never stop learning
    Basic LCD TV and Monitor troubleshooting guides.
    http://www.badcaps.net/forum/showthr...956#post305956

    Voltage Regulator (LDO) testing:
    http://www.badcaps.net/forum/showthr...999#post300999

    Inverter testing using old CFL:
    http://www.badcaps.net/forum/showthr...er+testing+cfl

    Tear down pictures : Hit the ">" Show Albums and stories" on the left side
    http://s807.photobucket.com/user/budm/library/

    TV Factory reset codes listing:
    http://www.badcaps.net/forum/showthread.php?t=24809

    Comment

    • tpearsall
      Member
      • Nov 2012
      • 25
      • USA

      #22
      Re: 2 Seconds to Black - Gateway LE1936

      Originally posted by Lumberjack777
      I'm sure budm will help you figure it out. If it turns out to be an inverter transformer, you are in luck. I believe that part number is SPW-068.
      http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40
      Except for my caps from Digikey; it seems like 99% of the parts I get nowadays are from China or Hong Kong.
      I'm sure budm will help you track down the problem before you need to buy anything. Good luck. ~L-J-7~
      That sure looks like it. Thanks!

      Comment

      • budm
        Badcaps Legend
        • Feb 2010
        • 40746
        • USA

        #23
        Re: 2 Seconds to Black - Gateway LE1936

        You have to have all lamps connected, the circuit will shutdown if it does not detect the lamps or lamp is over loading the circuits.
        Never stop learning
        Basic LCD TV and Monitor troubleshooting guides.
        http://www.badcaps.net/forum/showthr...956#post305956

        Voltage Regulator (LDO) testing:
        http://www.badcaps.net/forum/showthr...999#post300999

        Inverter testing using old CFL:
        http://www.badcaps.net/forum/showthr...er+testing+cfl

        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
        http://s807.photobucket.com/user/budm/library/

        TV Factory reset codes listing:
        http://www.badcaps.net/forum/showthread.php?t=24809

        Comment

        • tpearsall
          Member
          • Nov 2012
          • 25
          • USA

          #24
          Re: 2 Seconds to Black - Gateway LE1936

          Originally posted by budm
          You have to have all lamps connected, the circuit will shutdown if it does not detect the lamps or lamp is over loading the circuits.
          I had 3 CCFLs and the 1 test lamp connected. They all went on for 2 seconds then off. I didn't try the test lamp in place of each CCFL before I pulled the transformers which i think is what I was supposed to test.

          Soldering the transformers back in to test all in 4 CCFLs spots.

          Thanks!
          Last edited by tpearsall; 11-10-2012, 10:16 PM.

          Comment

          • tpearsall
            Member
            • Nov 2012
            • 25
            • USA

            #25
            Re: 2 Seconds to Black - Gateway LE1936

            Originally posted by budm
            From post 16 on this thread:
            https://www.badcaps.net/forum/showthread.php?t=7777
            It does look like you do have bad transformer. But do the lamp test first.
            I tested the CCFLs by plugging them into the inverter board one at a time. The CCFLs in T502 where bright. In T501, one did not light and other was dim. Next I plugged the "good" CCFLs from T502 into T501 they were dim/off and the CCFLs previously in T501 were bright in T502.

            Is it save to assume CCFLs are probably good and T501 is bad and I should replace them both or is further testing needed?

            T501
            1 to 5: .5ohms
            3 to 6: .5ohms
            7 to 8: 679ohms
            Rest were open

            T502
            1 to 5: .5ohms
            3 to 6: .5ohms
            7 to 8: 623ohms
            Rest were open

            Thanks.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: 2 Seconds to Black - Gateway LE1936

              On more test just to be sure so you do not have to order another part, we need to check the little blue ballast capacitors, all 4 of them, we will be looking for leakage resistance, no need to take them out, juts measure the resistance at the two legs.
              It does look like T501 is bad.
              So what did you use for the test lamp?
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • tpearsall
                Member
                • Nov 2012
                • 25
                • USA

                #27
                Re: 2 Seconds to Black - Gateway LE1936

                Originally posted by budm
                On more test just to be sure so you do not have to order another part, we need to check the little blue ballast capacitors, all 4 of them, we will be looking for leakage resistance, no need to take them out, juts measure the resistance at the two legs.
                It does look like T501 is bad.
                So what did you use for the test lamp?
                I bought a T5 4w but didn't use it. Before soldering/un-soldering all the connectors I did the "Alternatively, if you do not have a spare CCFL, then try this test." and tried each CCFL individually. When one did not light and one was dim on T501 I repeated the test putting those CCFLs on T502 and they where bright. In all cases they only light up for the 2 seconds. I didn't test with the test light, since everything out of T501 was bad.

                To test the CCFLs for leakage resistance do I need to test at the legs or can I test from the connectors? I haven't opened it far enough to expose the CCFL posts. From the connectors they all read open.

                Thanks!
                Last edited by tpearsall; 11-10-2012, 11:38 PM.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: 2 Seconds to Black - Gateway LE1936

                  Using one lamp at a time does work if the screen is not high contrast type, very hard to see unless you are in a dark room, that is why I like using test lamp. Poor connection at the lamp's end will still make the lamp light up for second also with normal brightness but will stop after warm up due to wire separation from the end of the lamp pin when everything expand when heat up.
                  So now you can order the two new transformers, just make sure to take the resistance reading to make sure they are OK.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • tpearsall
                    Member
                    • Nov 2012
                    • 25
                    • USA

                    #29
                    Re: 2 Seconds to Black - Gateway LE1936

                    Originally posted by budm
                    Using one lamp at a time does work if the screen is not high contrast type, very hard to see unless you are in a dark room, that is why I like using test lamp. Poor connection at the lamp's end will still make the lamp light up for second also with normal brightness but will stop after warm up due to wire separation from the end of the lamp pin when everything expand when heat up.
                    So now you can order the two new transformers, just make sure to take the resistance reading to make sure they are OK.
                    Makes sense. Thanks for your help, this has been a HUGE learning experience. I'll report back after the new transformers go in.

                    Thanks!

                    Comment

                    • tpearsall
                      Member
                      • Nov 2012
                      • 25
                      • USA

                      #30
                      Re: 2 Seconds to Black - Gateway LE1936

                      New transformers came in and the monitor is back in business! (I have to admit I have 2 screws left over).

                      Thank you for all of your help and the education!

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #31
                        Re: 2 Seconds to Black - Gateway LE1936

                        Thanks for the feedback on the repair.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment

                        • Lumberjack777
                          Badcaps Veteran
                          • Dec 2010
                          • 464

                          #32
                          Re: 2 Seconds to Black - Gateway LE1936

                          Originally posted by tpearsall
                          New transformers came in and the monitor is back in business! (I have to admit I have 2 screws left over).

                          Thank you for all of your help and the education!
                          We got really lucky those inverters tranformers were available. Thanks Budm for all your help out here.

                          So, you had 2 screws left over eh? Is that ALL?

                          Comment

                          Related Topics

                          Collapse

                          • ChIck3n
                            Dell u2311h 20000 seconds to black issue
                            by ChIck3n
                            So I've had this monitor for probably a decade now, and it's finally starting to fail. Began with a little sporadic flickering, then eventually started going black (power LED stays blue, can still see image on screen with flashlight). A power on/off fixes it for a bit, but then it happens again. Once it got to the point I was dealing with this every few minutes, I opened it up and just replaced all the caps (minus the big one) on the power board with new Panasonic ones. All the old caps tested fine on an ESR meter, and this worked for 5 days. But the screen just went black again today, so...
                            09-09-2024, 11:44 AM
                          • DrankinSAW
                            LG 37LG5020 and the tale of 2 seconds to black.
                            by DrankinSAW
                            I bought an LG 37LG5020 with a very strange issue.. it turns on, the display looks fine, but still, after 2 seconds, the TV shuts the backlight off..

                            However, if i leave it plugged in for 20-40min.. the time it takes to shutdown the backlight, doubles (to 4 seconds)..

                            I bought a new inverter, set to arrive on December 13th
                            11-22-2023, 01:10 PM
                          • Document Archive
                            HP EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera EliteDesk 800 i7-7700 Specification for Upgrade or Repair
                            by Document Archive
                            This specification for the HP EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera boardview and EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our...
                            09-12-2024, 02:00 PM
                          • Document Archive
                            MSI Cubi N 8GL-063DE/N4000/4GB/W10P/Black N4000 Specification for Upgrade or Repair
                            by Document Archive
                            This specification for the MSI Cubi N 8GL-063DE/N4000/4GB/W10P/Black can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the Cubi N 8GL-063DE/N4000/4GB/W10P/Black boardview and Cubi N 8GL-063DE/N4000/4GB/W10P/Black schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer...
                            09-12-2024, 01:58 PM
                          • Document Archive
                            Acer Aspire Acer Aspire 7 Charcoal Black Notebook 7 Specification for Upgrade or Repair
                            by Document Archive
                            This specification for the Acer Aspire Acer Aspire 7 Charcoal Black Notebook can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the Acer Aspire 7 Charcoal Black boardview and Acer Aspire 7 Charcoal Black schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...
                            09-07-2024, 05:00 AM
                          • Loading...
                          • No more items.
                          Working...