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    #1

    Toshiba 46RV530U - No Display. Has some power...

    Hello All.
    I just joined, and I've read a ton of posts already about a similar model TV here on the forums already.

    I've got this toshiba LCD HDTV, and a bad power supply.
    No idea what happened to this. I got it from a girl's frat house.

    Pulled the cover and checked for bad caps. I know a visual inspection isn't the end-all be-all, but nothing seems out of sorts.

    There does seem to be a whining / high-pitched squeal coming from the HV side of the power supply at the end. (See pic with highlights.)

    I've tested this board to this end only. I can get 12v from part A, and I do not get 24v from the inverter hookups.

    I've replaced the Cap at C820, as when I tested it with an ohmmeter, it registered no resistance. (The new one tested fine with 4 ohms, then to almost 0, then starting "charging")

    Also, the second fuse was popped. I've also replaced that part.

    In reading the other post,
    https://www.badcaps.net/forum/showpo...4&postcount=34

    I see someone else had a problem with R850. Now I do not know how to test a fused resistor. I put leads on it and checked with all the ranges, but I get nothing. The little resistor only says it's 1.8 ohms, so I'm guessing it should at least something.

    Regardless, it appears that something has broken and is not feeding power to the 24v side of the board. What that could be confuddles me, and my limited experience diagnosing electronics has become apparent.

    Any help? I would like to learn how to test this resistor, but if something else seems obvious, please; by all means...

    I'll post pics in the next post.
    Tags: None
    #2
    Re: Toshiba 46RV530U - No Display. Has some power...

    Picture of the Power Supply Board.
    PE0564 Rev A

    The squealing was coming from somewhere around R850. It's the little white resistor block at the bottom-left of the image. I guess it's also a fused resistor from reading the data spec sheet online.

    Resistor reads...
    RGDU5M-5E
    1.8 OHMS J
    NOBLE 98

    Not sure if this resistor is bad, as I don't know how to test it.


    Also, on a slightly different note. Is there a way to just test the LCD inverter board by supplying 24v DC to the pigtails that normally connect to it. The connectors for the 24v Inverter are the 2 white connectors at the top-left of the board.

    There is also a 12v DC connector on the left of the board that goes to the video board. That board lights up when the set is turned on. Also, when the set is plugged in, you hear a click like a relay is clicked on. And when you press the power button, you hear another click.

    but no video...

    Thanks!
    Attached Files
    Last edited by ryanhull76; 01-10-2012, 10:44 PM.

    Comment

      #3
      Re: Toshiba 46RV530U - No Display. Has some power...

      Originally posted by ryanhull76 View Post
      Now I do not know how to test a fused resistor. I put leads on it and checked with all the ranges, but I get nothing.
      Post a picture of your multimeter.

      If it is a manual range multimeter, set it to 200 ohms. Touch your probes together, it should be less than 1.0 ohms.

      Now measure the resistance. If it shows "1" on the left hand side, it means the resistors value is > 201 ohms (out of range). If it is supposed to be a 1.8 ohm resistor, then it is bad.
      --- begin sig file ---

      If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.

      We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.

      Please do not post inline and offsite as they slow down the loading of pages.

      --- end sig file ---

      Comment

        #4
        Re: Toshiba 46RV530U - No Display. Has some power...

        Sorry, bad day for a picture of the multi-meter.
        I did your test on the meter on the 200ohm setting, and it comes back with 1.3-1.5 on the display.

        When testing the resistor, no matter what setting I put it on, it stays @ 1 on the left side. I'm suspecting this resistor is bad.

        So question for everyone. I can order a new resistor and replace. Is there a way to bypass this resistor and continue testing the circuit?

        Also, I found the service manual for this tv and am posting it here as an attachment. Enjoy! (And after following the service manual, I've determined that I need to replace this power supply board! Go figure. lol)
        Attached Files

        Comment

          #5
          Re: Toshiba 46RV530U - No Display. Has some power...

          Try on the 2k ohm range.

          I have encountered those resistors failing on these types power supplies before. It's a common failure.
          Last edited by tom66; 01-11-2012, 09:56 AM.
          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

            #6
            Re: Toshiba 46RV530U - No Display. Has some power...

            Looking at this project so far, I've seen a bad 480v cap, a blown fuse (upper right corner of board near the part #.) and now this fused resistor.

            I'm starting to wonder what hit this TV, and what those frat girls did to it!

            I found the whole board tested on ebay for $40 including shipping. I wonder if that's just the route to go and stop messing around diagnosing part by part.

            If it did get hit by power surge, then I'm guessing I'm going to continue chasing bad parts across this thing.

            Suggestions? Comments?

            Comment

              #7
              Re: Toshiba 46RV530U - No Display. Has some power...

              Depends how much your time is worth to you.

              I would just go for the $40 board if I were you.
              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

                #8
                Re: Toshiba 46RV530U - No Display. Has some power...

                I broke down and bought a used PS on ebay for $40 including the shipping. Set fired right up. Works and looks great.

                I didn't figure it was worth the time to keep hunting down more bad parts, as without changing that fused resistor, who knows what else downstream was bad.

                I thank everyone for the help, and I'll keep helping in the networking section, as that's what I actually know well.

                -Ryan

                Comment

                  #9
                  Re: Toshiba 46RV530U - No Display. Has some power...

                  Originally posted by ryanhull76 View Post
                  I broke down and bought a used PS on ebay for $40 including the shipping. Set fired right up. Works and looks great.

                  I didn't figure it was worth the time to keep hunting down more bad parts, as without changing that fused resistor, who knows what else downstream was bad.

                  I thank everyone for the help, and I'll keep helping in the networking section, as that's what I actually know well.

                  -Ryan
                  That's great, another TV saved from landfill. Enjoy your TV.

                  I have come to the same conclusion before and often after spending more than a few days chasing a fault around in my spare time, I'll just replace the entire board and be done with it. That being said, I do like a good challenge, so locating and fixing boards on the component level is very satisfying.
                  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

                    #10
                    Re: Toshiba 46RV530U - No Display. Has some power...

                    Hi tom66 i have a PE0531 V28A000711C1 PSU for my toshiba tv and one of the resistors is dead do know of anywhere i can get these from many thanks

                    Comment

                      #11
                      Re: Toshiba 46RV530U - No Display. Has some power...

                      Originally posted by stejones View Post
                      Hi tom66 i have a PE0531 V28A000711C1 PSU for my toshiba tv and one of the resistors is dead do know of anywhere i can get these from many thanks
                      eBay, Rapid Online, Digi-Key, Mouser...
                      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

                        #12
                        Re: Toshiba 46RV530U - No Display. Has some power...

                        I believe Farnall has a trade counter in leeds.
                        Maplins probably ok for resistors
                        Please upload pictures using attachment function when ask for help on the repair
                        http://www.badcaps.net/forum/showthread.php?t=39740

                        Comment

                          #13
                          Re: Toshiba 46RV530U - No Display. Has some power...

                          Originally posted by tom66 View Post
                          eBay, Rapid Online, Digi-Key, Mouser...
                          you dont have a link to it do you pal i have been looking most of the day for these

                          Comment

                            #14
                            Re: Toshiba 46RV530U - No Display. Has some power...

                            Originally posted by selldoor View Post
                            I believe Farnall has a trade counter in leeds.
                            Maplins probably ok for resistors
                            thanks pal been there today and they have nothing

                            Comment

                              #15
                              Re: Toshiba 46RV530U - No Display. Has some power...

                              thats maplins i mean lol

                              Comment

                                #16
                                Re: Toshiba 46RV530U - No Display. Has some power...

                                What resistor are you looking for?
                                Please upload pictures using attachment function when ask for help on the repair
                                http://www.badcaps.net/forum/showthread.php?t=39740

                                Comment

                                  #17
                                  Re: Toshiba 46RV530U - No Display. Has some power...

                                  all its says on the resistor is RGDU5M-5E J1.8 NOBLE 85 this is the board
                                  Attached Files
                                  Last edited by stejones; 04-05-2012, 01:17 PM.

                                  Comment

                                    #18
                                    Re: Toshiba 46RV530U - No Display. Has some power...

                                    Does it have a colour code? Sounds like 1.8 ohms.
                                    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: Toshiba 46RV530U - No Display. Has some power...

                                      what u mean by the colour code pal

                                      Comment

                                        #20
                                        Re: Toshiba 46RV530U - No Display. Has some power...

                                        Tom is thinking of a standard type resistor if you had posted a picture it would have helped
                                        Does it look like this
                                        Please upload pictures using attachment function when ask for help on the repair
                                        http://www.badcaps.net/forum/showthread.php?t=39740

                                        Comment

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