LG lg52lb5d HDTV picture problem

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  • snapmech
    Member
    • Jan 2013
    • 10
    • United States
    #1

    LG lg52lb5d HDTV picture problem

    I have had this tv for about a year now, and during my last deployment my wife said it started having problems with the picture, the colors are very distorted, with no visible lines or anything. Well about two days after she told me it corrected itself. It did this two more times, well now it has done it again, and it wont fix itself. I opened the set up and noticed there are two or three blown caps on the main board, but would that cause picture issues? I thought that would cause power issues?

    I have attached two pictures that kind of capture the visual problems.
    Thanks for the help!!
    Attached Files
    Tags: None
    • awyatt2
      Badcaps Veteran
      • Feb 2012
      • 407
      • america
      #2
      Re: LG lg52lb5d HDTV picture problem

      are the caps on the main board or power supply? if you are getting ripple on the caps or the powersupply is out of spec it could cause problems. change them out and see. i have fixed totally dead sets with a single cap change.

        Comment

        • snapmech
          Member
          • Jan 2013
          • 10
          • United States
          #3
          Re: LG lg52lb5d HDTV picture problem

          Sorry I am new to tv repair. I have been repairing computers for awhile so i thought i would give tv's a shot. Is the main board the board with the all the inputs(a/v inputs)? Because the board I have found bad caps on had no inputs and its large next to the one with the inputs, i cannot put pics up tonight, because i needed to reassemble it to move it.

            Comment

            • awyatt2
              Badcaps Veteran
              • Feb 2012
              • 407
              • america
              #4
              Re: LG lg52lb5d HDTV picture problem

              you are proballt talking about the powersupply, rule of thumb if the power plug goes there then it is usually power supply.

                Comment

                • snapmech
                  Member
                  • Jan 2013
                  • 10
                  • United States
                  #5
                  Re: LG lg52lb5d HDTV picture problem

                  I looked up the internals of a generic lg tv, it appears i would be talking about the powersupply. So that could cause picture problems eh? I may have to order some caps here for it. Are you able to see the problem with the pictures i posted, i thought it might be kind of hard to tell what exactly im talking about, its almost like a cloud over it. But very distorted colors also.

                    Comment

                    • snapmech
                      Member
                      • Jan 2013
                      • 10
                      • United States
                      #6
                      Re: LG lg52lb5d HDTV picture problem

                      Here is an updated photo of the picture appears to be getting worse.
                      Attached Files

                        Comment

                        • awyatt2
                          Badcaps Veteran
                          • Feb 2012
                          • 407
                          • america
                          #7
                          Re: LG lg52lb5d HDTV picture problem

                          do you have a voltmeter to check voltage out on power supply? they should be marked eg. 3.3, 5, 12 etc. it could be another problem but most likley it is voltage related. tom66 or bud m could probally answer better than me, but i always go to the voltages first.the thing about caps is the fact they dont always bloat or rupture, they can fail and give no visual indication. i use a peak 70 esr meter to identify the bad ones. it paid for itself in time saved on repairs on several sets. when tom gets here he can probally tell you more than me but i would guess caps causing ripple or lower than normal voltage.

                            Comment

                            • snapmech
                              Member
                              • Jan 2013
                              • 10
                              • United States
                              #8
                              Re: LG lg52lb5d HDTV picture problem

                              I do have a dmm, i just need to replace the fuse in it lol, blew it doing some automotive work. I will try to this tomorrow evening, gotta work tomorrow. I'm not familiar with an esr meter.

                                Comment

                                • retiredcaps
                                  Badcaps Legend
                                  • Apr 2010
                                  • 9271
                                  #9
                                  Re: LG lg52lb5d HDTV picture problem

                                  Originally posted by snapmech
                                  I do have a dmm, i just need to replace the fuse in it lol, blew it doing some automotive work.
                                  Most modern multimeters do not require a working fuse in order to measure voltage.

                                  However, you do require a working fuse in order to measure current. Measuring current is something the regulars rarely ask people to do.
                                  --- 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

                                    • snapmech
                                      Member
                                      • Jan 2013
                                      • 10
                                      • United States
                                      #10
                                      Re: LG lg52lb5d HDTV picture problem

                                      Its a fluke multimeter when i went was measuring current on a alternator i went over the limit of the fuse, it will not read anything now. I will try again.

                                      Thanks for all the input so far! I really appreciate it!

                                        Comment

                                        • snapmech
                                          Member
                                          • Jan 2013
                                          • 10
                                          • United States
                                          #11
                                          Re: LG lg52lb5d HDTV picture problem

                                          Originally posted by retiredcaps
                                          Most modern multimeters do not require a working fuse in order to measure voltage.

                                          However, you do require a working fuse in order to measure current. Measuring current is something the regulars rarely ask people to do.
                                          You were correct, it is still working I'm not sure what i was thinking.

                                            Comment

                                            • awyatt2
                                              Badcaps Veteran
                                              • Feb 2012
                                              • 407
                                              • america
                                              #12
                                              Re: LG lg52lb5d HDTV picture problem

                                              i overlooked to mention you need the ground on the metal case and the power supply connected as working state. be carefull around the heatsinks they can be live.

                                                Comment

                                                • retiredcaps
                                                  Badcaps Legend
                                                  • Apr 2010
                                                  • 9271
                                                  #13
                                                  Re: LG lg52lb5d HDTV picture problem

                                                  Originally posted by snapmech
                                                  Its a fluke multimeter when i went was measuring current on a alternator i went over the limit of the fuse, it will not read anything now.
                                                  Fluke fuses will cost anywhere between $6 and $12 each.

                                                  It sounds like you blew the 10A fuse. Most Flukes will read up to 20A for less than 30 seconds before blowing.

                                                  For car work, you may want to consider a DC clamp.

                                                  PS. Which Fluke model do you have?
                                                  --- 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

                                                    • snapmech
                                                      Member
                                                      • Jan 2013
                                                      • 10
                                                      • United States
                                                      #14
                                                      Re: LG lg52lb5d HDTV picture problem

                                                      Ill check the model of my dmm when i get to work. I have a dc clamp i just need it mailed to me.

                                                      Anything else i should check while i have it open?

                                                      I plan to replace the known bad capcitors and check power supply voltages.

                                                        Comment

                                                        • awyatt2
                                                          Badcaps Veteran
                                                          • Feb 2012
                                                          • 407
                                                          • america
                                                          #15
                                                          Re: LG lg52lb5d HDTV picture problem

                                                          look for any obvious signs of burned components, you may find the problem is with the caps.

                                                            Comment

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