Lg 32le4500

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  • pintail120
    New Member
    • Dec 2021
    • 3
    • United Kingdom
    #1

    Lg 32le4500

    Hi all,
    I use to repair TV's for my bread and butter but now do it as a hobby. I have the above tv from a friend for repairs. When the TV is turned on cold it comes on ok, I have set the unit to display the demo screen and it will happily continue to do this for hours and then the relay in the PSU will start turning on and off repeatedly. If I check the on/off voltage from main board to turn the PSU you, it is fluctuating. The back light also turns off. however if I partially remove the riser to the back light the backlight turns on, but the screen is blank. If it turn the set off and leave it for 45min its turns on again and is fine. I have replace ALL the electrolytic caps in the PSU, not sure where to look next ? could it be the main board ? are there any more electrolytics I could have missed or is it something else ?
    thanks in advance for any help
    kind regards
    Gavin
    Tags: None
    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: Lg 32le4500

      Have you tried pressing on processor to see if if stabilizes?
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • diif
          Badcaps Legend
          • Feb 2014
          • 6978
          • England
          #3
          Re: Lg 32le4500

          Yeah, i also suspect a BGA issue.

            Comment

            • tvtimmy
              Badcaps Legend
              • Mar 2015
              • 1160
              • usa
              #4
              Re: Lg 32le4500

              It is a bga issue. A proper re- balling will cure it.

                Comment

                • diif
                  Badcaps Legend
                  • Feb 2014
                  • 6978
                  • England
                  #5
                  Re: Lg 32le4500

                  I'd just reflow it, a decent reflow will last years.

                    Comment

                    • pintail120
                      New Member
                      • Dec 2021
                      • 3
                      • United Kingdom
                      #6
                      Re: Lg 32le4500

                      Hi,
                      thank you kindly for all your suggestions.
                      Any nice tutorials you can recommend on bga reflow techniques ?

                        Comment

                        • dskall
                          Badcaps Legend
                          • Oct 2016
                          • 2905
                          • usa
                          #7
                          Re: Lg 32le4500

                          I don't know of any actual reflow videos. Reflow implies that the solder is molten. All the "reflows" I've watched are just heating the board with flux to clean the oxide from the broken solder joints.
                          I assume no responsibility for any stupid suggestions I might post.

                            Comment

                            • diif
                              Badcaps Legend
                              • Feb 2014
                              • 6978
                              • England
                              #8
                              Re: Lg 32le4500

                              Reflowing is melting the solder. Some of the balls crack due to thermal expansion and contraction over time, mainly due to the lack of lead in the solder that allowed a little bit of flex.
                              Reballing replaces the lead free balls with leaded ones that should provide a longer lifespan.

                                Comment

                                • dskall
                                  Badcaps Legend
                                  • Oct 2016
                                  • 2905
                                  • usa
                                  #9
                                  Re: Lg 32le4500

                                  Originally posted by diif
                                  Reflowing is melting the solder. Some of the balls crack due to thermal expansion and contraction over time, mainly due to the lack of lead in the solder that allowed a little bit of flex.
                                  Reballing replaces the lead free balls with leaded ones that should provide a longer lifespan.
                                  Can you suggest a video of a real reflow?
                                  I assume no responsibility for any stupid suggestions I might post.

                                    Comment

                                    • diif
                                      Badcaps Legend
                                      • Feb 2014
                                      • 6978
                                      • England
                                      #10
                                      Re: Lg 32le4500

                                      Originally posted by dskall
                                      Can you suggest a video of a real reflow?
                                      I haven't watched one for years since I bought my rework machine.

                                      They will look like the videos you are watching but without the stupid "cleaning oxidization from broken joints" comments and more "it's to reflow the cracked balls" comments. They have a profile that melts solder and they might nudge the chip to check the solder is liquidious and watch it spring back.

                                      OP, There is a great thread on here with some decent home reflowing, use the search feature along with my username as I know I was in it, you should be able to find it.

                                        Comment

                                        • vinceroger69
                                          Badcaps Legend
                                          • Mar 2012
                                          • 6714
                                          • uk
                                          #11
                                          Re: Lg 32le4500

                                          https://www.badcaps.net/forum/showth...home+reflowing

                                            Comment

                                            • VitalComputing
                                              Member
                                              • Dec 2021
                                              • 29
                                              • Ireland
                                              #12
                                              Re: Lg 32le4500

                                              Apologies, need to post to activate my posting of new threads.

                                                Comment

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