LG 42PJ350- No picture

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  • ascertain
    New Member
    • Jun 2014
    • 8
    • USA
    #1

    LG 42PJ350- No picture

    Hello all, I've been looking for a forum like this for a while...glad I found it!

    I have a LG 42PJ350 that my neighbor gave me for free because it wont turn on. I figured I would give it a go and hope I can fix it. When I initially plug it in I hear two clicks "Click....Click" and the stand-by light illuminates. However, when I push the power button, nothing happens except the stand-by light extinguishes. I did some research on the model and someone suggested I change capacitors C360 and C351 on the power supply board. I changed them and still have the same issues. I have checked the three fuses on the Y-SUS board and the three fuses on the power supply board (all check good). I then disconnected the Y-SUS board and tried to power on the TV, still no voltage at VS and VA. I didn't want to randomly pull any other components off the board just to put a meter on them, however, if you suggest it, I'm willing to try anything. Any thoughts?

    Thank you in advance...
    Tags: None
    • sordids999
      Badcaps Legend
      • May 2013
      • 2152
      • uk
      #2
      Re: LG 42PJ350- No picture

      You could try changing the x2 5W22RJ resistors on the power unit should be R927 R929 worked for me when i had the same problem clicking when trying to power up the tv

        Comment

        • ascertain
          New Member
          • Jun 2014
          • 8
          • USA
          #3
          Re: LG 42PJ350- No picture

          It only clicks when I plug it in initially. It won't click when I push the power button. Do you still recommend I change the resistors? Thanks

            Comment

            • sordids999
              Badcaps Legend
              • May 2013
              • 2152
              • uk
              #4
              Re: LG 42PJ350- No picture

              https://www.badcaps.net/forum/showthread.php?t=37530

              This may help you worth a try

                Comment

                • ascertain
                  New Member
                  • Jun 2014
                  • 8
                  • USA
                  #5
                  Re: LG 42PJ350- No picture

                  Great read. Thanks. I changed both resistors. Unfortunately, it didn't fix the issue. Still doing the same. Any ideas? Thanks.

                    Comment

                    • sordids999
                      Badcaps Legend
                      • May 2013
                      • 2152
                      • uk
                      #6
                      Re: LG 42PJ350- No picture

                      hello maybe Tom66 might be able to help you more he might reply

                        Comment

                        • tom66
                          EVs Rule
                          • Apr 2011
                          • 32560
                          • UK
                          #7
                          Re: LG 42PJ350- No picture

                          You checked Vs & Va from Y-sustain board using a volt meter?
                          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

                            • ascertain
                              New Member
                              • Jun 2014
                              • 8
                              • USA
                              #8
                              Re: LG 42PJ350- No picture

                              Sorry for not getting back to you any sooner, I was out of town for the 4th of July...

                              Update...I plugged in the TV, hit the power button, and it turned on!!! The picture was perfect. Unfortunately, after I turned it off it wouldn't turn back on

                              Tom66, I checked for power on the power supply board (top left connector on the picture). It's the connector that connects the YSUS and the power supply board together. There was no power there.

                              Thank you.
                              Attached Files

                                Comment

                                • ascertain
                                  New Member
                                  • Jun 2014
                                  • 8
                                  • USA
                                  #9
                                  Re: LG 42PJ350- No picture

                                  Any thoughts from anyone?

                                    Comment

                                    • martino
                                      Not so "senior"
                                      • Aug 2013
                                      • 997
                                      • canada
                                      #10
                                      Re: LG 42PJ350- No picture

                                      Can we get a pic from the plug that goes from the powerboard to the mainboard? Should be a printing beside it telling what wire does what... like standby power,power-on etc...
                                      Proud owner of dozens of broken TV's and many,many,many boards.


                                      Our website and passion:http://hollenhundshepherds.com/

                                        Comment

                                        • ascertain
                                          New Member
                                          • Jun 2014
                                          • 8
                                          • USA
                                          #11
                                          Re: LG 42PJ350- No picture

                                          Martino, I have attached the picture. Thanks
                                          Attached Files

                                            Comment

                                            • martino
                                              Not so "senior"
                                              • Aug 2013
                                              • 997
                                              • canada
                                              #12
                                              Re: LG 42PJ350- No picture

                                              I'm kinda curious if you get the power-on signal from the mainboard or not..
                                              Kinda hard to read on that pic....Having a standby light would suggest the 5 volt standby is working,do you get any voltage on pl-on and m-on? (not totally sure,which on turn on the powersupply to be honest)..
                                              Proud owner of dozens of broken TV's and many,many,many boards.


                                              Our website and passion:http://hollenhundshepherds.com/

                                                Comment

                                                • ascertain
                                                  New Member
                                                  • Jun 2014
                                                  • 8
                                                  • USA
                                                  #13
                                                  Re: LG 42PJ350- No picture

                                                  I have 5 vdc on both rl_on and m_on. I attached a better picture of the connector. Thanks
                                                  Attached Files
                                                  Last edited by ascertain; 07-16-2014, 04:46 PM.

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