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    #1

    Unknown LCD TV

    Found this TV last week that I've never heard of before, brought home since panel would also be nice as PC monitor 'for the wife', anyways it runs on a
    12V external power supply that did not come with the TV but I have a few around the house.
    So the problem here I believe is the inverter as the TV comes on with menu for about 3 seconds and then shuts down, the standby light remains green.
    I tested the back lights with another PSU/inverter and it seems they are working, I might utilize this panel with another PC video card but it seems the harness to the T-con socket will require a relocation of some wires as the PC desktop did not show only colors, red to green as if it was calibrating?
    I changed out one cap C13 which was reading fairly low as you can probably see in the pic 'sh*t' soldering but no change in operation, the ceramic caps
    C1 & C2 near the transformers also have an odd reading 6.5 Ohms both ways, is this normal?
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    #2
    Re: Unknown LCD TV

    C5 and C6 could cause this fault. Looks like something got quite hot around there.
    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

      #3
      Re: Unknown LCD TV

      The 2 resistors next to these caps also read 6,6 Ohms both ways!

      Comment

        #4
        Re: Unknown LCD TV

        Originally posted by rigeback View Post
        The 2 resistors next to these caps also read 6,6 Ohms both ways!
        Maybe they're in parallel?
        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

          #5
          Re: Unknown LCD TV

          Change all the electrolytics... Two on the inverter and three on the logic...

          You'll also need to re-cap the brick... If you can't pry it apart, use a dremel. Don't cut too deep though.
          "We have offered them (the Arabs) a sensible way for so many years. But no, they wanted to fight. Fine! We gave them technology, the latest, the kind even Vietnam didn't have. They had double superiority in tanks and aircraft, triple in artillery, and in air defense and anti-tank weapons they had absolute supremacy. And what? Once again they were beaten. Once again they scrammed [sic]. Once again they screamed for us to come save them. Sadat woke me up in the middle of the night twice over the phone, 'Save me!' He demanded to send Soviet troops, and immediately! No! We are not going to fight for them."

          -Leonid Brezhnev (On the Yom Kippur War)

          Comment

            #6
            Re: Unknown LCD TV

            Originally posted by mockingbird View Post
            Change all the electrolytics... Two on the inverter and three on the logic...

            You'll also need to re-cap the brick... If you can't pry it apart, use a dremel. Don't cut too deep though.
            Yes I agree with re-capping of the boards but as for the brick I don't have it!
            I believe its 5A-12v and I think I will try to install a internal PSU as I don't have 5A bricks.

            Comment

              #7
              Re: Unknown LCD TV

              I tested the back lights with another PSU/inverter and it seems they are working, I might utilize this panel with another PC video card but it seems the harness to the T-con socket will require a relocation of some wires as the PC desktop did not show only colors, red to green as if it was calibrating?
              My best alternative here might be to utilize the PSU - Video card that is working https://www.badcaps.net/forum/showthread.php?t=16712

              Comment

                #8
                Re: Unknown LCD TV

                I hooked up the other video board with its PSU which tested fine on the back light test but with video hooked up same scenario, shuts down within 3 seconds and led remains green! I did move 1 ground wire to match the original harness and I could see the desk top on boot etc.
                I'm suspecting that this could also be a T-con related problem now??

                Comment

                  #9
                  Re: Unknown LCD TV

                  After reading a post and Retiredcaps thread I remembered that one side of my panel had delayed on start up and what I'm seeing now is one of the ccfl wires heat shrink has almost fallen off its connecting tube! Will split the panel tomorrow when theres better light.
                  How are these wires connected to the lamps, are they soldered??

                  Comment

                    #10
                    Re: Unknown LCD TV

                    Yeah. There's a metal pin coming out at the end of the CCFL tube, and the wire is usually wrapped around that pin and then soldered onto it.

                    The tricky part is if the end of the CCFL is enclosed in some sort of rubber block / endcap, which can be a bit of a pain to cut open without destroying the whole thing.

                    Comment

                      #11
                      Re: Unknown LCD TV

                      Originally posted by Scenic View Post
                      Yeah. There's a metal pin coming out at the end of the CCFL tube, and the wire is usually wrapped around that pin and then soldered onto it.

                      The tricky part is if the end of the CCFL is enclosed in some sort of rubber block / endcap, which can be a bit of a pain to cut open without destroying the whole thing.
                      Example below.

                      http://www.ccflwarehouse.com/lasotu.html
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                      Comment

                        #12
                        Re: Unknown LCD TV

                        yesterday i had success in rewiring a pair of upper ccfls. it was a no name italian monitor too, just like yours. and from my experience (tiny comparing to some gurus in this forum) all cheapo brands suffer from bad wiring. had more than 20 cases just like this because where i live cheapo brands are very common. all have same components and parts and different strange names.

                        Comment

                          #13
                          Re: Unknown LCD TV

                          Well done with the wiring! My panel is OK no busted wires or shorts, tested the lamps and they work perfectly, the panel is a http://www.digitalview.com and is well made, the video/TV board and inverter are a pos.
                          I'm in the process of changing the caps that I bought today but I don't think the caps are the solution I think there could be a problem with MP1410 2A Step Down DC to DC Converter, I will know more after fitting the caps!

                          Comment

                            #14
                            Re: Unknown LCD TV

                            Check D1 on the inverter board (located above J5 in the first picture). It looks like its plastic case has melted.

                            Comment

                              #15
                              Re: Unknown LCD TV

                              Well as I mentioned before the readings on MP1410 were just the same after recapping most of board with 12V, that led me back to the PSU question?? Tried 5 different bricks all 12V and no ways would it start then as a last alternative I rigged it up to my test computer's PSU and bingo the panel works great. I manage to fined a manual and will look for another brick or mounted PSU tomorrow so suspend will work.
                              Thanks for all the feed back.

                              Comment

                                #16
                                Re: Unknown LCD TV

                                Are the bricks you tRIED rated at least 5A?
                                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

                                  #17
                                  Re: Unknown LCD TV

                                  One brick was rated for 6A but the voltage was higher than 12V around 12.7V the suspend light would come on but no amber to green, the 2A would start it up but the inverter would shut down, strangely the Hannstar PSU would run the CCFL's but the video card was not supported and would also shut down.
                                  The stripping of the panel was worth it as there was a lot dust and soot, they must of had this tv next to a fire place!

                                  Comment

                                    #18
                                    Re: Unknown LCD TV

                                    Originally posted by rigeback View Post
                                    The stripping of the panel was worth it as there was a lot dust and soot, they must of had this tv next to a fire place!
                                    Or smokers. I had a plasma TV to repair which was brought down by cigarette smoke.
                                    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

                                      #19
                                      Re: Unknown LCD TV

                                      Yep I used oven degrease to clean out chassis and isopropolyn to clean the boards, I wouldn't have thought ash could get inside a panel though, this makes me think about my 50" which is in the same room as the pellet heater, lots of fine dust so might blow it out with compressor this summer.
                                      Last edited by rigeback; 05-12-2012, 12:08 AM. Reason: spelling

                                      Comment

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