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VIZIO L37HDTV10A: Lightning damage

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    #1

    VIZIO L37HDTV10A: Lightning damage

    Hi folks,

    First post, which is good and bad... Glad to be on board, but unfortunately this also means my TV took a hit.

    I'll post pictures as attachments.

    Okay so we had a BIG BOOM the other night and my VIZIO L37HDTV10A(LCD) died. It was $1,300 when I bought it in 2008(ouch!), but if I could fix it for less than $100 I think it's worth it.

    Symptoms:

    * Black screen
    * Status light "Green", but should be amber when in stand by
    * All buttons and remote are unresponsive

    I've been reading this thread, which has helped me get started troubleshooting. It would be great if I could get a bit of help in identifying the bad board. I'm leaning towards MAIN board but I'm new to TV repair.

    I've gotten as far as testing the power board somewhat, but that is where I have stopped.

    I have 5 volts on the standby pins of the board(there are two of them). I have zero on all other outputs.

    I believe that I would need to put 3.3 volts on the PSON pin to make the PS "turn on" the other outputs... is that correct? And if so, would I do all of this with all of the plugs removed? (besides main power of course)

    Also, should I ground the 3 volt supply to chassis?

    Any help would be GREATLY appreciated and thanks for having me on this very cool forum! I love fixing stuff!

    Thanks in advance!


    Marty
    Attached Files
    Tags: None
    #2
    Re: VIZIO L37HDTV10A: Lightning damage

    Couple other notes:

    I had HDMI from a Direct TV box hooked up and that is all

    Nothing else in the house was affected from the lightning, but it did hit about 500~ feet from my house.

    Previously, I was hearing the "clicking" noise when I turned it on, which I believe is a symptom of something going bad???

    Comment

      #3
      Re: VIZIO L37HDTV10A: Lightning damage

      It sounds very much like a main board failure , have had several Vizio's just like it..

      Comment

        #4
        Re: VIZIO L37HDTV10A: Lightning damage

        Thanks for the input Kevin, it's much appreciated. I have just found one on eBay for $27, so it's been ordered! I'll let you guys know how it works out. (I'd still like to hear any answers to the PS board questions I had though)


        Marty

        Comment

          #5
          Re: VIZIO L37HDTV10A: Lightning damage

          You can test the power supply and inverter board to see if they are OK or not by
          1) Disconnect the cable between the main board and the power supply.
          2) You will need external 3~4.5 V power (use two or three good batteries connected in series, I prefer 4.5V), the negative to the metal chassis, the positive will feed two 1K resistor, one end of each resistor will be joined together at the positive of the batteries.
          3) The other end of one resistor will be connected to the power supply board 'PS_ON' pin.
          4) The other end of the second resistor will be connected to 'A' first (we are not sure yet which one of the 'A' and 'B' is for the BL_ON. There are two signals (BL_ON, Dim) from the main board that are routed through the power supply board to the inverter board, this is done to keep the wiring simple) to see if the backlights will come on, if not then move the connection to 'B', one of these pins is for the BL_ON. You should see the backlights come on.
          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

            #6
            Re: VIZIO L37HDTV10A: Lightning damage

            Can we get a few pics of the PSU?

            It looks like the big capacitor on it has shrunk its plastic covering, and exploded.
            Muh-soggy-knee

            Comment

              #7
              Re: VIZIO L37HDTV10A: Lightning damage

              Budm, thanks very much! I didn't realize I need to also put the voltage on the "A" or "B" as well. I thought I would just hit the PSON and then should get voltages across all outputs. I am about to do this now and will report findings.

              Ben, I am attaching a closeup pic here. I see what you mean, but I think that may just be how the cap is wrapped originally. If it expanded that much that is crazy!

              Again, I really appreciate this forum!!! Nice to see people out there take time to help others.


              Marty
              Attached Files

              Comment

                #8
                Re: VIZIO L37HDTV10A: Lightning damage

                Originally posted by martyparish View Post
                Budm, thanks very much! I didn't realize I need to also put the voltage on the "A" or "B" as well. I thought I would just hit the PSON and then should get voltages across all outputs. I am about to do this now and will report findings.

                Ben, I am attaching a closeup pic here. I see what you mean, but I think that may just be how the cap is wrapped originally. If it expanded that much that is crazy!

                Again, I really appreciate this forum!!! Nice to see people out there take time to help others.


                Marty
                Uhm, yeah, that cap is bad. Looks like it had gone bad, bulged a little, and got hot too (hence the shrunken cover)
                Muh-soggy-knee

                Comment

                  #9
                  Re: VIZIO L37HDTV10A: Lightning damage

                  Hmm, okay I wasn't thinking in terms of the wrapper shrinking. That makes sense. Also, just looked up some pics of this board on Google

                  http://futuregatetech.com/Websites/f...88b6b0f90a.JPG

                  So, this begs the question, are BOTH the PS and the MAIN boards gone??? I've already ordered the MAIN but it was only $28 so no big issue there...

                  I'm about to run the PS test now but I assume it's bad after this revelation lol.


                  Marty

                  Comment

                    #10
                    Re: VIZIO L37HDTV10A: Lightning damage

                    Sorry for the delay in following up. I've been waiting for my main board to arrive.

                    However, just tried testing the PS. Can you guys confirm that I am testing it properly? I've attached a closeup photo to show what I am doing.

                    Thanks!
                    Attached Files

                    Comment

                      #11
                      Re: VIZIO L37HDTV10A: Lightning damage

                      I would connect PSON to 5V with resistor in between.
                      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: VIZIO L37HDTV10A: Lightning damage

                        Thanks Tom!

                        I am using a variable power supply set at 4V for the two leads. They both have 1k resistor. Will that not work?

                        Thanks again for the help, it is appreciated!!!

                        Marty

                        Comment

                          #13
                          Re: VIZIO L37HDTV10A: Lightning damage

                          Hey guys,

                          Just wanted to check in and give status update. I'm not going to abandon this project until all hope is lost!

                          So, my good deal(main board $28) fell through... The ebay seller tells me "we don't have this item in stock..." wth? And they waited until around the damn thing was supposed to be at my doorstep.

                          Anyhow, I started looking closer at the main board, with the help of this site of course.

                          I found a bad fuse on the board. I was going to explore the voltage regulators that I keep hearing about on this site. When none of them had any voltage I then noticed a fuse that I missed previously.

                          Unfortunately, I did the dreaded taboo, I jumped the fuse temporarily. Hopefully I didn't make things worse...

                          When I did jump the fuse, my indicator light changed to flashing white. I didn't notice any particular number of flashes that would give me a code.

                          Would you guys mind taking a peek at the board and let me know if you have any thoughts?


                          Thanks!

                          Marty
                          Attached Files

                          Comment

                            #14
                            Re: VIZIO L37HDTV10A: Lightning damage

                            The flashing white light could be the Capacitors in the standby circuit are discharging, I have a good working 42" Vizio that has a flashing white light every time you unplug it and plug it back in, I've seen the white light flash at least 30 some times up to 60 some times, since you have already jumped the fuse, what happens if you leave it plugged in and wait to see if the white Vizio Logo finally stops flashing and then see if it will power on?

                            Also, do you have any voltage at PSON now with the fuse jumped?

                            A little pricey but I ordered a main board for a 37" Vizio from this seller and it works fine now.I believe this is the same as yours.

                            http://www.ebay.com/itm/VIZIO-3370-0...30823245495%26
                            Last edited by MisterD; 01-14-2013, 10:50 AM.

                            Comment

                              #15
                              Re: VIZIO L37HDTV10A: Lightning damage

                              Thanks for the feedback MisterD. I believe you are right. While testing the PSU(by jumping STBY to PSON with mainboard disconnected), I am getting fluctuating voltage on STBY and PSON. Plus, another member already identified a bad cap visually from the pic in post #7.(the large cap)

                              So, it appears I have at least two problems... PSU and Main board.

                              Question: Do you guys think replacing these PSU caps with same brand is okay? The large one is Nichicon GU series and I have located it on digikey:

                              http://www.digikey.com/scripts/DKSea...37491101357060

                              Question 2 Has anyone had a chance to look at my last attachment? I have more info now. The fuse shown with the arrow is blown and there is a short to ground on the dead side of the fuse.

                              Again, any help is super appreciated !!!


                              Marty
                              Last edited by martyparish; 01-14-2013, 04:16 PM.

                              Comment

                                #16
                                Re: VIZIO L37HDTV10A: Lightning damage

                                Yes, Nichicon is an excellent capacitor manufacturer.
                                However, even the best caps fail under stress or extreme surge.
                                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

                                  #17
                                  Re: VIZIO L37HDTV10A: Lightning damage

                                  Thanks tom66! I did find them in the "good caps" thread so thought it okay! But then I saw later in the thread people talking about a bad batch or something.

                                  I suppose I will order the caps and get that part going while I attempt to find the short on the main. (long shot for me but I will darn sure try)

                                  Thanks again!

                                  Comment

                                    #18
                                    Re: VIZIO L37HDTV10A: Lightning damage

                                    They had a bad batch in computer motherboards, but that was back in 2001~2004, and they've since rectified the issue.
                                    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: VIZIO L37HDTV10A: Lightning damage

                                      Hey BadCappers I'm back on this VIZIO today. I believe I have at least found the problem on the PSU.

                                      Looks like this IC may have fried. Check out the attached image, it sure looks like there's been excessive heat. (I don't really know how to properly test this thing)

                                      The chip is:

                                      SMPS Evaluation Board with CoolSET TM F3 ICE3B1565

                                      Anyone have an idea how I could test it properly to confirm damage?

                                      * image note: I have already removed the odd "v shaped" heat sink that was atop the IC.
                                      Attached Files

                                      Comment

                                        #20
                                        Re: VIZIO L37HDTV10A: Lightning damage

                                        Here's the datasheet for that IC, the last link was just an application note.

                                        Comment

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