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    #1

    Toshiba 32HLC56

    Hi,

    I have a Toshiba 32HLC56 that has a problem:

    When the power button is pressed, the relay switches one time, exactly 2 seconds later the backlight comes on with a black screen for about .3 seconds, then shuts off (no relay related or other sounds audible). Exactly 1 second later the speakers pop on with the typical noise floor one would expect to hear from the audio amplifier circuit.

    I have attempted heating each board's capacitors with a very hot hair dryer for several minutes and observed absolutely no changes in it's behavior.

    I'd appreciate any input anyone could give me on tackling this repair. Thanks :-).

    SK
    Tags: None
    #2
    Re: Toshiba 32HLC56

    Pics? Please post using manage attachements.
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      #3
      Re: Toshiba 32HLC56

      I haven't taken any of the boards out because I don't know where to start. Which board(s) should I post picts of?

      Thanks,
      SK

      Comment

        #4
        Re: Toshiba 32HLC56

        We generally want to see an overall pic showing how all the boards are connected. Then we want an individual pic of each board.
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          #5
          Re: Toshiba 32HLC56

          Ok. Thanks.

          Here is an overall layout and some closer shots of the boards on one side. I'll post some of the opposite sides of the boards as soon as I get them off (unless I shouldn't remove them all just yet - please advise).

          It is woth noting that the screen just shut off one day and never came back on, except for the little .3 second lighting of the backlight at power-up. No intermittent problem before hand and it does the exact same thing every time.
          Attached Files
          Last edited by stevekasian; 01-22-2011, 02:36 AM.

          Comment

            #6
            Re: Toshiba 32HLC56

            Check the fuses on the power board first to make sure they all read less than 1.0 ohms.

            I see FE75, F889, F802, and F801 on the power board (upper right). There may be more and check for fuses on the other boards as well.
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            Comment

              #7
              Re: Toshiba 32HLC56

              Ok. Checked all boards. There was only a main power fuse other than the ones you mentioned. All measure .1 ohm.

              Here are some picts of the back of the boards. Plz let me know if you would like higher resolution images.
              Attached Files
              Last edited by stevekasian; 01-22-2011, 03:52 AM.

              Comment

                #8
                Re: Toshiba 32HLC56

                This sounds like 'two seconds to black', but I don't see any sign of an inverter.

                My suggestion is to hook up a known signal - DVD player or video game - and step through the inputs until you hear the sound from the speakers. See if you can see anything on the screen if you shine a bright light on it.

                PlainBill
                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                Comment

                  #9
                  Re: Toshiba 32HLC56

                  2 seconds to black it is (I guess??)

                  Display is functional, just no backlight. I knew i should've checked that first thing. I need to start listening to my common sense more often.

                  Ok, so... we've established that the backlight failing to light properly is the issue.

                  A Guide To Troubleshooting '2 Seconds To Black'
                  - https://www.badcaps.net/forum/showthread.php?t=10419

                  Any additional links you can recommend would be greatly appreciated! Thanks!!

                  Note: This problem isn't really "2 seconds"... it's more like "1/3 of a second" to black. Any special suggestions in this particular case?

                  Thanks!
                  SK
                  Last edited by stevekasian; 01-22-2011, 07:14 AM.

                  Comment

                    #10
                    Re: Toshiba 32HLC56

                    Originally posted by stevekasian View Post
                    2 seconds to black it is (I guess??)

                    Display is functional, just no backlight. I knew i should've checked that first thing. I need to start listening to my common sense more often.

                    Ok, so... we've established that the backlight failing to light properly is the issue.

                    A Guide To Troubleshooting '2 Seconds To Black'
                    - https://www.badcaps.net/forum/showthread.php?t=10419

                    Any additional links you can recommend would be greatly appreciated! Thanks!!

                    Note: This problem isn't really "2 seconds"... it's more like "1/3 of a second" to black. Any special suggestions in this particular case?

                    Thanks!
                    SK
                    2 seconds, 1/3 of a second. Compared to the age of the universe, they are but an instant.

                    Don't knock yourself out on failing to check if it was a backlight problem. I waster more than a week that way once.

                    The first step would be figuring out where the inverter is, and posting a picture of it. If this is a multi-transformer inverter, a shorted secondary winding is a common problem.

                    PlainBill
                    For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                    Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                    Comment

                      #11
                      Re: Toshiba 32HLC56

                      I have fixed similar problem before (Toshiba 32HL57), one or more of the cccfl is bad was found.

                      Comment

                        #12
                        Re: Toshiba 32HLC56

                        Ok, found the inverter. Behind the chassis plate the other boards are connected to. Here is a layout pic (not sure what the board is at the top) and some macro picts.

                        Thanks,
                        SK
                        Attached Files

                        Comment

                          #13
                          Re: Toshiba 32HLC56

                          Originally posted by stevekasian View Post
                          Here is a layout pic (not sure what the board is at the top) and some macro picts.
                          With power off and lcd unplugged, check the secondaries on the inverter transformer. I believe you should test S1-S2 and S3-S4 on 2000 ohms (if manual dmm). Test them all and list the measurements here.

                          Secondaries are identified at

                          http://lcdparts.net/TransformerDetai...ProductID=2727
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                            #14
                            Re: Toshiba 32HLC56

                            $21.99?? Holy Scheiße! I hope none of these are bad!

                            Testing...

                            Comment

                              #15
                              Re: Toshiba 32HLC56

                              All transformers check good, except T103. S1 & S2 measures open circuit on all scales.

                              Is that $21.99 price tag for real, or is there a cheaper place to buy these things from?

                              Thanks,
                              SK

                              p.s. Except for on T103, as mentioned above, measurements between S1 & S2 and S3 & S4 on all transformers read 1.4K. Measurements between P1 & P2 on all transformers read .4 ohms.
                              Last edited by stevekasian; 01-23-2011, 06:25 AM. Reason: Added "p.s."

                              Comment

                                #16
                                Re: Toshiba 32HLC56

                                Originally posted by stevekasian View Post
                                All transformers check good, except T103. S1 & S2 measures open circuit on all scales.

                                Is that $21.99 price tag for real, or is there a cheaper place to buy these things from?

                                Thanks,
                                SK

                                p.s. Except for on T103, as mentioned above, measurements between S1 & S2 and S3 & S4 on all transformers read 1.4K. Measurements between P1 & P2 on all transformers read .4 ohms.
                                Not much luck on finding a cheaper source. $21.99 is a total ripoff, but is cheaper than the inverter. Try using a search engine, you might get a hit.

                                About a year ago I picked up a similar transformer (same form factor, different turns ratio) for $12 from electronica-usa.com. (I checked, they don't have the 4001Q transformer.) At that time I found the 4006A variant available for $5.00 each, quantity 100.

                                PlainBill
                                For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

                                Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

                                Comment

                                  #17
                                  Re: Toshiba 32HLC56

                                  Dayumm.... Ok.

                                  So, dumb question: Is this most likely my problem?

                                  Not so dumb question: Is there any other checking you would recommend i do to make sure it's the only problem before ordering this thing?

                                  Also: How does this type of lighting circuit work - do all bulbs rely on each other for lighting, sort of like a series circuit? So if one bulb doesn't light for any reason, none of the others do?

                                  Thanks,
                                  SK
                                  Last edited by stevekasian; 01-23-2011, 03:21 PM.

                                  Comment

                                    #18
                                    Re: Toshiba 32HLC56

                                    Originally posted by stevekasian View Post
                                    So, dumb question: Is this most likely my problem?
                                    You could still have a bad ccfl, bad ccfl wiring, and/or bad caps on the inverter board (high ESR).

                                    $22 isn't too bad considering new 32 inch LCD TVs still sell for over $300CDN here in Canada.

                                    Not so dumb question: Is there any other checking you would recommend i do to make sure it's the only problem before ordering this thing?
                                    If you have a spare TV, then check the above.

                                    Also: How does this type of lighting circuit work - do all bulbs rely on each other for lighting, sort of like a series circuit? So if one bulb doesn't light for any reason, none of the others do?
                                    My understanding and layman's answer is that some pwm controllers have an "all or nothing" approach. All the ccfl's work or none at all.

                                    The more technical explanation and might be applicable here is this post by PlainBill (he posted this in the computer display, not TV section) ...

                                    https://www.badcaps.net/forum/showpo...&postcount=113
                                    Last edited by retiredcaps; 01-23-2011, 04:28 PM.
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                                    Comment

                                      #19
                                      Re: Toshiba 32HLC56

                                      A possible cheaper solution. If you search for your TV in the ebay completed listings, I found auction

                                      150546704854

                                      The seller writes

                                      "I'm taking this T.V. apart and selling parts. Send me a message with the part you would like and I'll list it as buy now. Or buy the whole thing but shipping is expensive that's all. If you can pick up that'll work too."

                                      Ask him/her if they are willing to sell you a working (verified by a multimeter) transformer say for $10 + shipping?
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                                        #20
                                        Re: Toshiba 32HLC56

                                        Thank you for the heads up on that auction retiredcaps! Mucho appreciatado.

                                        I removed the transformer and, sure enough, there is a burn mark in the windings.

                                        I've contacted the ebay seller and we'll see what happens. Thanks again!
                                        SK

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