LG TV shuts of (70uh6350ub)

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • svargo
    Member
    • Jan 2022
    • 10
    • United States

    #1

    LG TV shuts of (70uh6350ub)

    I have an LG TV (70uh6350ub) that shut off by itself one day (no video or sound). I turned it back on & it stayed on for about 10 min. then shut off again. Turned is back on & it shut off after about 3 seconds. Since then, if I leave the set unplugged over night it will come on (video & sound) for about 2 to 5 min., then shut off (although the backlight stays on for several sec, to about 1 min.). After that, if turned on, it will shut off in about 2 sec., or not turn on at all.

    Took the back off & noticed that the green led on the power board flashes 5 times (continues doing so) once the TV shuts itself off.

    I have the service manual, however it shows a power board different from the one I have ( EAY63749303). Therefore the pin out designations are likely very different.

    Any help or suggestions? All this started about 1 week out of warranty.
  • dskall
    Badcaps Legend
    • Oct 2016
    • 2905
    • usa

    #2
    Re: LG TV shuts of (70uh6350ub)

    Need good clear pictures of boards and power board to main board connecter.
    I assume no responsibility for any stupid suggestions I might post.

    Comment

    • Diah
      Badcaps Legend
      • Feb 2013
      • 6350
      • Germany

      #3
      Re: LG TV shuts of (70uh6350ub)

      led indicatore on PCB related to LED BL. so here are your issue.

      Comment

      • svargo
        Member
        • Jan 2022
        • 10
        • United States

        #4
        Re: LG TV shuts of (70uh6350ub)

        I will take & post some pics. On the LED BL, is it the electronics that control the BL, or the LEDs themselves? Is there a way to check the LEDs with a test meter without removing the LEDs? Or a way to check the led controls?

        Comment

        • Diah
          Badcaps Legend
          • Feb 2013
          • 6350
          • Germany

          #5
          Re: LG TV shuts of (70uh6350ub)

          upload as requested above focused high resolution Photos on yours Power boards from the top and downside.. so we can assist you with way to make measurements.

          Comment

          • Storyteller12
            Badcaps Veteran
            • Jun 2020
            • 624
            • USA

            #6
            Re: LG TV shuts of (70uh6350ub)

            It’s the backlights.

            Comment

            • nomoresonys
              Badcaps Legend
              • Jan 2013
              • 12086
              • U.S.

              #7
              Re: LG TV shuts of (70uh6350ub)

              do this, when it comes on try turning the backlights way down, if no backlight adjustment then turn the brightness way down and see if the tv stays on longer.

              Comment

              • svargo
                Member
                • Jan 2022
                • 10
                • United States

                #8
                Re: LG TV shuts of (70uh6350ub)

                Attached are photos showing 1.the back of the TV, 2 power board, 3. main board, 4. t-con board.

                I did reduce the brightness during a previous start up. no real change in how long it is on.

                I did notice some heat from the power board area when I still had the back on the tv. stayed heated if I kept the tv plugged in, but not on. could this be an issue?
                Attached Files

                Comment

                • svargo
                  Member
                  • Jan 2022
                  • 10
                  • United States

                  #9
                  Re: LG TV shuts of (70uh6350ub)

                  Just wondered if there was a way to check the backlights/ backlight system without disassembly?

                  Also, I mentioned the heating because if the power board area is heated (warm) either from turning it on recently, or from leaving it plugged it, it will not turn on (or if it does, only for about 1 second). The set will only come on (2 -5 min.) if it has been setting unplugged for a while. Not a very scientific analysis, but there does seem to be a pattern.

                  Any help is appreciated.

                  If additional photos are needed, please advise. As I mentioned the power board on my unit is different from the service manual. Mine has a 28 pin cable to the main board, while the manual shows an 18 pin cable.

                  Comment

                  • Diah
                    Badcaps Legend
                    • Feb 2013
                    • 6350
                    • Germany

                    #10
                    Re: LG TV shuts of (70uh6350ub)

                    upload photo of the power boards from the downside to the area where you have 3 sockets for BL LED to see LED+ on each socket are connected together or not to tell you how to make the measurement.

                    Comment

                    • captainKKK
                      Badcaps Veteran
                      • Sep 2018
                      • 287
                      • United States

                      #11
                      Re: LG TV shuts of (70uh6350ub)

                      You might find this interesting: https://www.badcaps.net/forum/showthread.php?t=104184

                      Comment

                      • Diah
                        Badcaps Legend
                        • Feb 2013
                        • 6350
                        • Germany

                        #12
                        Re: LG TV shuts of (70uh6350ub)

                        Originally posted by captainKKK
                        what you post and advertise at yours links are rubbish specialty your last post #17
                        wish you learn what are LED and how they work first. sorry i cant give better answer to any hijack threats with rubbish advertisement.
                        Last edited by Diah; 05-02-2022, 03:15 PM.

                        Comment

                        • captainKKK
                          Badcaps Veteran
                          • Sep 2018
                          • 287
                          • United States

                          #13
                          Re: LG TV shuts of (70uh6350ub)

                          [QUOTE=svargo;1130051] said "Just wondered if there was a way to check the backlights/ backlight system without disassembly?"

                          Svargo asked and I offered what had already been discussed. There is no Hijacking, Threats or rubbish, just opinions. That "rubbish" as you call it was published by the manufacturer. Sorry you are offended, ESPECIALLY by his guide in #17.
                          Last edited by captainKKK; 05-02-2022, 09:33 PM.

                          Comment

                          • Storyteller12
                            Badcaps Veteran
                            • Jun 2020
                            • 624
                            • USA

                            #14
                            Re: LG TV shuts of (70uh6350ub)

                            There is a safety wire you can cut in the harness and it will disable the tv from cutting off from backlight fault. I would not use the tv like this as it can cause a fire and will kill the other leds from to much current.

                            You need to reconnect the wire you cut after testing.

                            It’s the backlights 100% though.

                            Comment

                            • svargo
                              Member
                              • Jan 2022
                              • 10
                              • United States

                              #15
                              Re: LG TV shuts of (70uh6350ub)

                              Just got back to this. Thanks all for responding

                              For Diah, I have this question. Are you saying that I need a photo of the backside of the power board in the area of the backlight connectors? That means I need to remove the power board to take that photo.. Please confirm. I believe the backlight connectors are the "P801, P802 and P803 " on the power board (in the photo I have posted) Am I correct?

                              The backlights were the last things I had hoped to have to deal with, as I did not want to have to deal with disassembling a 70 inch screen. But on the positive side, they are the only parts currently available for this TV on ShipJimmy.

                              Also, based on the comments by "Storyteller12" apparently the TV will shut off if there is a problem with the backlights. Does this include the sound? I say this because when the video goes out, the sound does also.

                              Comment

                              • svargo
                                Member
                                • Jan 2022
                                • 10
                                • United States

                                #16
                                Re: LG TV shuts of (70uh6350ub)

                                I was reading some similar posts, including one about the same TV. Seems that most folks who have the backlights go out can still see the video using the "flashlight" test, and the sound does not shut off. In my case, the video and sound shut off. I can not see any video using the flashlight test.

                                I bring this up because I had a computer monitor go out a few months ago. When the screen went dark, I found that I could still see the video if I darkened the room and shined a flash light onto the screen. Turns out it was the cfl backlights not working.

                                So my secondary question in this matter is why some folks still have video and sound when their backlights fail, but I do not have video or sound?

                                Comment

                                • Storyteller12
                                  Badcaps Veteran
                                  • Jun 2020
                                  • 624
                                  • USA

                                  #17
                                  Re: LG TV shuts of (70uh6350ub)

                                  When the backlights fail in this tv it cuts off.

                                  Some TVs will stay on even with no backlights that’s how you see the picture with the flashlight test and hear sound.

                                  Ie: Roku TVs stay in with no backlights.

                                  Comment

                                  • svargo
                                    Member
                                    • Jan 2022
                                    • 10
                                    • United States

                                    #18
                                    Re: LG TV shuts of (70uh6350ub)

                                    So, it seems that all roads lead to the backlights.

                                    I have just started to attempt electronics repair, so I would like to run some diagnostics, to inform future endeavors.

                                    The service manual I downloaded references the correct TV, but show, and had data on the wrong power board. Any help on locating the correct manual? My power board has a 28 pin connector to the MB, the manual I have shows an 18 pin connector.

                                    To Diah, I will take a photo of the back of the power board, and post it. That will help, correct?

                                    Comment

                                    • svargo
                                      Member
                                      • Jan 2022
                                      • 10
                                      • United States

                                      #19
                                      Re: LG TV shuts of (70uh6350ub)

                                      Any idea which wire is this "safety wire."

                                      Comment

                                      Related Topics

                                      Collapse

                                      • cloo
                                        Panasonic ZT60 plasma tv with strange behavior and 8 blink code
                                        by cloo
                                        I recently got my hands on a 60" Panasonic P60ZT60 plasma tv (european model) that has some strange issues along with an 8 blink code.
                                        It know this tv is getting old but it was once considered one of the best plasmas ever made, and i think it is still holds on to that even by todays standards.


                                        So, long story short. When i first got the tv it had a very bright washed out picture with very raised blacks in all picture modes and i couldn't find the cause in the picture setting menus.
                                        After doing a factory reset this problem was gone and the picture was back to...
                                        01-06-2025, 06:02 AM
                                      • ronaldopdias
                                        PS5 EDM-010 - Intermittently Power
                                        by ronaldopdias
                                        Hi everyone,

                                        I received this PS5 for repair, and it’s been quite difficult to diagnose.
                                        It beeps once and turns off. The power draw goes up to 100W, then drops back to 0.20W. However, if I keep trying to power it on, it eventually turns on and stays on. I can play games without any issues.

                                        Once it's turned on, I can shut down and power back on normally.
                                        But if I leave it off for an hour or so, it starts beeping again and shuts down—back to square one.

                                        I couldn't find any shorts on the board.

                                        The UART log shows the following:...
                                        07-02-2025, 04:13 AM
                                      • sam_sam_sam
                                        Lift Master Garage Door wall switch display / motion sensor controller display disappeared no back light
                                        by sam_sam_sam
                                        This happened last Saturday and today I finally had time this morning before I went to work to replace two non brand capacitors

                                        I will let you be the judge weather or not these are bad or not according to the blue ESR meter that I am using

                                        I am comparing them to a brand new one that I installed

                                        The display came back on and the programming was not lost which I was surprised by I would have thought that when the display went blank that so did the memory as well

                                        I going to let it run for several days before I remount back on the wall next to the...
                                        09-05-2024, 06:48 PM
                                      • Document Archive
                                        HP ProDesk 600 G5 + APC Back-UPS 700VA ProDesk 600 i7-9700 Specification for Upgrade or Repair
                                        by Document Archive
                                        This specification for the HP ProDesk 600 G5 + APC Back-UPS 700VA can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the ProDesk 600 G5 + APC Back-UPS 700VA boardview and ProDesk 600 G5 + APC Back-UPS 700VA schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...
                                        09-12-2024, 02:30 PM
                                      • Document Archive
                                        HP ProDesk 600 G5 + APC Back-UPS 700VA ProDesk 600 i5-9500 Specification for Upgrade or Repair
                                        by Document Archive
                                        This specification for the HP ProDesk 600 G5 + APC Back-UPS 700VA can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the ProDesk 600 G5 + APC Back-UPS 700VA boardview and ProDesk 600 G5 + APC Back-UPS 700VA schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum. Please note that we offer no warranties...
                                        09-12-2024, 02:30 PM
                                      • Loading...
                                      • No more items.
                                      Working...