VIZIO L37HDTV10A: Lightning damage

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • martyparish
    Badcaps Veteran
    • Dec 2012
    • 313
    • United States

    #21
    Re: VIZIO L37HDTV10A: Lightning damage

    I tested it for shorts and noticed that pin 8(GND) and 3(CS) are shorted. Would that be normal?

    Any feedback is appreciated!!!

    Comment

    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK

      #22
      Re: VIZIO L37HDTV10A: Lightning damage

      Yes, that is normal. CS is connected through a low-ohm resistor to GND.
      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

      • martyparish
        Badcaps Veteran
        • Dec 2012
        • 313
        • United States

        #23
        Re: VIZIO L37HDTV10A: Lightning damage

        Thanks Tom.

        Is testing this IC with just a DMM is out of the question?

        Also, considering there is heat related discoloration visible, should I just consider that part cooked? (it's gonna take 3 weeks to get one!!!)

        Comment

        • tom66
          EVs Rule
          • Apr 2011
          • 32560
          • UK

          #24
          Re: VIZIO L37HDTV10A: Lightning damage

          That's the standby controller. If there was no power at all, suspect that. Otherwise, suspect something else.
          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

          • martyparish
            Badcaps Veteran
            • Dec 2012
            • 313
            • United States

            #25
            Re: VIZIO L37HDTV10A: Lightning damage

            Thanks for that info Tom, I'll not order it then.

            Here's an observation that may mean something. When putting voltage on PSON, the 5V standby begins to fluctuate. Does that set off any particular red flags?

            Comment

            • tom66
              EVs Rule
              • Apr 2011
              • 32560
              • UK

              #26
              Re: VIZIO L37HDTV10A: Lightning damage

              It makes me suspect a startup capacitor.
              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

              • martyparish
                Badcaps Veteran
                • Dec 2012
                • 313
                • United States

                #27
                Re: VIZIO L37HDTV10A: Lightning damage

                Hot damn, on to something now. Thanks for the nudge Tom

                Did the hair dryer test on the caps and bamn! after about ten seconds, the voltage stabilized. (should have done the dryer test long ago)

                Time to get some caps and go from there! Still got a main board issue as well.

                Comment

                • tom66
                  EVs Rule
                  • Apr 2011
                  • 32560
                  • UK

                  #28
                  Re: VIZIO L37HDTV10A: Lightning damage

                  Cap on primary?
                  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

                  • martyparish
                    Badcaps Veteran
                    • Dec 2012
                    • 313
                    • United States

                    #29
                    Re: VIZIO L37HDTV10A: Lightning damage

                    I had already replaced the large cap. I aimed the heat right at the caps under the rightmost heat sink in this pic

                    I also did notice that the other rails still did not come on when the voltage stabilized.
                    I want an ESR meter!!

                    Comment

                    • tom66
                      EVs Rule
                      • Apr 2011
                      • 32560
                      • UK

                      #30
                      Re: VIZIO L37HDTV10A: Lightning damage

                      ESR don't be what kills those caps; no, Jimmy, it's leakage, I tell you! A normal ohmmeter will catch 'em.
                      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

                      • martyparish
                        Badcaps Veteran
                        • Dec 2012
                        • 313
                        • United States

                        #31
                        Re: VIZIO L37HDTV10A: Lightning damage

                        Ah okay! I am getting reading on a few of them when testing resistance. They are still in the circuit though. I will pull em and retest. I'm slowly learning with your help thanks!

                        Comment

                        • martyparish
                          Badcaps Veteran
                          • Dec 2012
                          • 313
                          • United States

                          #32
                          Re: VIZIO L37HDTV10A: Lightning damage

                          ESR don't be what kills those caps; no, Jimmy, it's leakage, I tell you! A normal ohmmeter will catch 'em.
                          Hey Tom(or anyone who knows), how exactly do I test with ohmmeter? Am I looking for a dead short or a specific reading?


                          Thanks

                          Comment

                          • tom66
                            EVs Rule
                            • Apr 2011
                            • 32560
                            • UK

                            #33
                            Re: VIZIO L37HDTV10A: Lightning damage

                            Ideally, you'd apply rated voltage across them to test for leakage, but any less than 100k on an ohmmeter after the reading settles is suspect.
                            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

                            • martyparish
                              Badcaps Veteran
                              • Dec 2012
                              • 313
                              • United States

                              #34
                              Re: VIZIO L37HDTV10A: Lightning damage

                              Hey guys it's been a while but I am STILL not giving up on this tv

                              The latest is, I replaced(almost) all caps on the power supply and still have the issue with fluctuating voltage on standby/PSON. STBY is normal 5v UNTIL I jump it to PSON then it starts bouncing from 2v to 5v.

                              So, I thought one of the FETs nearby were gone but they check out ok. I even pulled one and it's fine.

                              I heated the area a little left of the area with all the caps and this time it stabilized much faster.

                              The one cap that I did not replace(stupid) is the 47uf 50v that sits right next to a transformer in the middle of the board. I'm guessing that is the start up cap???

                              If that is the start up, then I really feel stupid because Tom66 told me he suspected a start up cap and I replaced all BUT that one doh!

                              One of these days, I will get this PSU going so that I can then work on the main board. I'm hoping that the main is the common LDO issue...

                              Thanks for all of the help so far!

                              Comment

                              • ben7
                                Capaholic
                                • Jan 2011
                                • 4059
                                • USA

                                #35
                                Re: VIZIO L37HDTV10A: Lightning damage

                                Originally posted by martyparish
                                Hey guys it's been a while but I am STILL not giving up on this tv

                                The latest is, I replaced(almost) all caps on the power supply and still have the issue with fluctuating voltage on standby/PSON. STBY is normal 5v UNTIL I jump it to PSON then it starts bouncing from 2v to 5v.

                                So, I thought one of the FETs nearby were gone but they check out ok. I even pulled one and it's fine.

                                I heated the area a little left of the area with all the caps and this time it stabilized much faster.

                                The one cap that I did not replace(stupid) is the 47uf 50v that sits right next to a transformer in the middle of the board. I'm guessing that is the start up cap???

                                If that is the start up, then I really feel stupid because Tom66 told me he suspected a start up cap and I replaced all BUT that one doh!

                                One of these days, I will get this PSU going so that I can then work on the main board. I'm hoping that the main is the common LDO issue...

                                Thanks for all of the help so far!
                                Yes that is the cap. They are commonly 47uF 50v as you said your is, and they can make the PSU output fluctuate.
                                Muh-soggy-knee

                                Comment

                                • martyparish
                                  Badcaps Veteran
                                  • Dec 2012
                                  • 313
                                  • United States

                                  #36
                                  Re: VIZIO L37HDTV10A: Lightning damage

                                  Update: I replaced the start up cap and still have the fluctuation issue. There is something else in that area that is shorted. I super quick shot(2-3 secs) of hot air straightens it out.

                                  I will keep investigating on that, but in the meantime I can still work on the main board.

                                  Question: What's the procedure of removing the LVDS cable from the main board? It's an odd looking connector and I don't want to do any damage.


                                  Thanks!

                                  Comment

                                  • tom66
                                    EVs Rule
                                    • Apr 2011
                                    • 32560
                                    • UK

                                    #37
                                    Re: VIZIO L37HDTV10A: Lightning damage

                                    Check the voltage across the startup cap.
                                    Also ALL small primary side caps should be replaced.

                                    The controller ICs can become leaky too, which can cause this fault as well.
                                    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

                                    • martyparish
                                      Badcaps Veteran
                                      • Dec 2012
                                      • 313
                                      • United States

                                      #38
                                      Re: VIZIO L37HDTV10A: Lightning damage

                                      That was fast Tom! Do you mean all ceramic and film caps on the primary? I'm guessing yes, since that's all I see on primary side.

                                      I am suspicious of that IC too! It really looked like it took some heat at some point.

                                      Regarding the LVDS cable, Should that just slide right up and out? I don't see any retainers on it just worried that I may screw it up removing it.

                                      Thanks yet again!

                                      Comment

                                      • tom66
                                        EVs Rule
                                        • Apr 2011
                                        • 32560
                                        • UK

                                        #39
                                        Re: VIZIO L37HDTV10A: Lightning damage

                                        I mean electrolytic caps. For now the poly caps aren't suspect.

                                        If you post a pic of the LVDS cable I'll make some suggestions.
                                        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

                                        • martyparish
                                          Badcaps Veteran
                                          • Dec 2012
                                          • 313
                                          • United States

                                          #40
                                          Re: VIZIO L37HDTV10A: Lightning damage

                                          Here's a pic. It's slightly blurred but hopefully clear enough for you to see the connector type. Thanks!
                                          Attached Files

                                          Comment

                                          Related Topics

                                          Collapse

                                          • Tynan Dill
                                            Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                                            by Tynan Dill
                                            I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                                            Upon bringing it home and plugging it up, it showed a standby light.

                                            I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                                            The screen seems to blackout and stay black, but with a flashlight I can see the display.

                                            With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                                            Assuming...
                                            11-22-2024, 01:46 PM
                                          • m1ch43lzm
                                            HP Pavilion 15-eh Board DAG7HAMB8F0 - CPU throttling to 0.4GHz (PROCHOT_EXT) and black screen
                                            by m1ch43lzm
                                            Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
                                            Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...
                                            05-12-2025, 08:37 PM
                                          • howardc64
                                            A1312 (27” iMac 2009-2011) A1407 (Thunderbolt Display) A1316 (Cinema Display) Display Black Screen Repair
                                            by howardc64
                                            Problem

                                            This is an LG edge LED lit LCD Display. The LEDs are on the bottom edge of the display. There are 2 bars (left and right) Each bar has many LEDs and a 6 pin connector. Each pin drive several LEDs thus is the highest current flow / heat junction. The weak lead free solder gradually fails with thermal expansion/contraction cycling and increases resistance. PSU will compensate up to a point, then when the current is too high, PSU just shut down the backlight causing a dark display. I have even seen one which the connector just fell off as solder points became completely detached....
                                            08-04-2024, 10:36 PM
                                          • Hakuu
                                            LG OLED77G1PUA - No Video / Audio after a TCON Board change and Software Update
                                            by Hakuu
                                            Hi There,

                                            This TV was auto switching off after few seconds with some vertical lines on the screen, so got a new TCON board and replaced it.

                                            After replacing the TCON board it was working fine and i set it up with everything, used for few hours, then had the bright idea to update the software on it. During the update process, TV switched off and now no audio or video. No relay switch sound.

                                            More Details

                                            TV Model - LG OLED77G1PUA

                                            Got the same exact TCON board from TVPartsToday and replaced it. But didnt transfer the EPPROM data (didnt...
                                            07-12-2023, 02:37 PM
                                          • canadaboy25
                                            Panasonic TC-P54VT25 No image. A or D board?
                                            by canadaboy25
                                            I have a Panasonic TC-P54VT25 that will power on and prime the display but there is no image at all.

                                            The panel is primed as there is a slight glow from the entire panel. This means the problem should be logic related. The service manual also confirms this and recommends replacing the A or the D board.

                                            I have tried to get the TV to display the test sequence but I have been unable to and I don't even know if this TV has a test sequence or not. I tried following tom66's instructions in post #3 on this thread https://www.badcaps.net/forum/showthread.php?t=26790. There was...
                                            01-17-2021, 01:06 AM
                                          • Loading...
                                          • No more items.
                                          Working...