eax64905001 No Pfc Help ?

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  • gurug
    Member
    • Mar 2015
    • 27
    • Slovenia

    #41
    Re: eax64905001 No Pfc Help ?

    Originally posted by gurug
    I disconnected mosfet q801, and i got 46V on led connector and no fluctuation... does that mean that q801 is bad?
    Tested q801 and it seems ok ... hm, I guess I'll just order new power supply

    Comment

    • gurug
      Member
      • Mar 2015
      • 27
      • Slovenia

      #42
      Re: eax64905001 No Pfc Help ?

      Originally posted by gurug
      Tested q801 and it seems ok ... hm, I guess I'll just order new power supply
      Hm, order "new" power supply board, but no luck ... seems this board I got is broken too ... It has 0V on LED output ... but I'm wondering, it is same model of board EAX64905001, but original was REV2.0 and this one I bought via eBay is REV4.0... Is this relevant?

      Like I said before on old board when I disconnect MOSfet I got stable 46V on connector ... please advice me further where to look - mosfet seems ok ...

      Thanks

      Comment

      • gurug
        Member
        • Mar 2015
        • 27
        • Slovenia

        #43
        Re: eax64905001 No Pfc Help ?

        Problem SOLVED!

        It was two LED's which were broken on backlight ... power supply does not output 70V if it detects problem with LED's ... So it was in protective mode. I replaced LED's and TV is working normally. Thanks for you help and ideas!

        Comment

        • ReeceyBurger123
          Never Give Up !
          • May 2014
          • 7325
          • Britain

          #44
          Re: eax64905001 No Pfc Help ?

          Nice work
          Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

          https://www.facebook.com/Telford-Tel...7894576335359/

          Comment

          • jarda105
            New Member
            • Aug 2016
            • 4
            • Czech Republic

            #45
            Re: eax64905001 No Pfc Help ?

            Hi, I have similiar problem with EAX64905001. I have no output voltage on con P801 with unconnected LED panel. Is there any protective when there's not load on output ? Or should be there 80V ? Thank you.

            Comment

            • ReeceyBurger123
              Never Give Up !
              • May 2014
              • 7325
              • Britain

              #46
              Re: eax64905001 No Pfc Help ?

              It should at start up with the Leds out fire up to 80v then back to 24v if there are no Leds if not then the Leds are fine and Psu is at fault.
              Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

              https://www.facebook.com/Telford-Tel...7894576335359/

              Comment

              • jarda105
                New Member
                • Aug 2016
                • 4
                • Czech Republic

                #47
                Re: eax64905001 No Pfc Help ?

                Thank you, I'll do some measurements.

                Comment

                • jarda105
                  New Member
                  • Aug 2016
                  • 4
                  • Czech Republic

                  #48
                  Re: eax64905001 No Pfc Help ?

                  Please for advice. Voltage on P801 - led output is between 0 - 0.6V (oscilating). TV is operating (with headlamp directed on LCD panel I can see MENU). Testpoints P802 (43-45V), P803 same. P203 11.9V, P202 23.3V, P204 23.3V
                  Q801 - DRAIN 44V source and gate 0V
                  Q802 - DRAIN 0.130V source and gate 0.020V
                  Main voltages are 3.45V, 23.4V, 12V, on con. to Mainboard PDIN 1.12V and DRVON is 3,0V
                  On IC801 pin 9 PWMO (to Q802) is 0,02V. Vcc is 12V and REF is 4,96V. But gate pin 3 is only 0,02V. Thank you for any advice. What voltage should be on IC801 on pin 9? On schematic is Q803 but I can't find it on board - probabaly it's different version.

                  Comment

                  • jarda105
                    New Member
                    • Aug 2016
                    • 4
                    • Czech Republic

                    #49
                    Re: eax64905001 No Pfc Help ?

                    One more thing is after cca 10minutes of measuring is hard to touch heatsink on Q101 because of temp I think about 60°C.

                    Comment

                    • Guest

                      #50
                      Re: eax64905001 No Pfc Help ?

                      Originally posted by gurug
                      Problem SOLVED!

                      It was two LED's which were broken on backlight ... power supply does not output 70V if it detects problem with LED's ... So it was in protective mode. I replaced LED's and TV is working normally. Thanks for you help and ideas!

                      Did you replaced the entire led stripe or just the single leds? in the second case can you tell me the led's identification code?

                      Thanks

                      Comment

                      • CostasCostas
                        Member
                        • Feb 2017
                        • 20
                        • Cyprus

                        #51
                        Re: eax64905001 No Pfc Help ?

                        Hi guys, I have this PSU with a 3 to 4 year old 32" LG TV. A few days ago the good wife splashed water on the TV, near the IR sensor, and now we just have sound and no picture.

                        Trawling the internet suggests it might be a problem with the t-con board. I have checked the voltage readings on the psu and they seem to tie up with what's in this thread. I should just add that the LED's are coming on, just no picture.

                        For the t-con board I have checked against the published voltage points and they look ok. Can't find any details or check points on the main video board.

                        Do you think it will be the t-con that has failed or are there any basic tests I can do on the video board?

                        Comment

                        • Andrew F. Ali
                          Badcaps Legend
                          • Jan 2014
                          • 2450
                          • Trinidad & Tobago

                          #52
                          Re: eax64905001 No Pfc Help ?

                          Did you dry up all the moisture? Blow some hot air in the spill area with a blower for a couple minutes and retry a start-up.

                          Comment

                          • CostasCostas
                            Member
                            • Feb 2017
                            • 20
                            • Cyprus

                            #53
                            Re: eax64905001 No Pfc Help ?

                            We just left it switched off for a few days before stripping it down. No moisture inside.

                            Comment

                            • CostasCostas
                              Member
                              • Feb 2017
                              • 20
                              • Cyprus

                              #54
                              Re: eax64905001 No Pfc Help ?

                              Any thoughts on how I can check if it is the tcon board that is faulty, or the video board?

                              Comment

                              • vinceroger69
                                Badcaps Legend
                                • Mar 2012
                                • 6714
                                • uk

                                #55
                                Re: eax64905001 No Pfc Help ?

                                Originally posted by CostasCostas
                                Any thoughts on how I can check if it is the tcon board that is faulty, or the video board?
                                what is the tv model number im wondering if it has tab bonds on the bottom of the lcd screen
                                so the set has nothing on the screen no backlights flash when you first turn it on?
                                Last edited by vinceroger69; 02-21-2017, 02:04 PM.

                                Comment

                                • CostasCostas
                                  Member
                                  • Feb 2017
                                  • 20
                                  • Cyprus

                                  #56
                                  Re: eax64905001 No Pfc Help ?

                                  It's an LG 32LN 540B. Backlights are fine and so is audio, just no video.

                                  Comment

                                  • vinceroger69
                                    Badcaps Legend
                                    • Mar 2012
                                    • 6714
                                    • uk

                                    #57
                                    Re: eax64905001 No Pfc Help ?

                                    Originally posted by CostasCostas
                                    It's an LG 32LN 540B. Backlights are fine and so is audio, just no video.
                                    ok can you post a picture of the t con board theres a fuse on it so you will need to test voltage to BOTH sides of it usually 12vdc

                                    Comment

                                    • CostasCostas
                                      Member
                                      • Feb 2017
                                      • 20
                                      • Cyprus

                                      #58
                                      Re: eax64905001 No Pfc Help ?

                                      I tested all the regular test points on the t-con board and they were fine. I checked the t-con fuse for continuity although I'm not sure if I actually checked for 12V.
                                      I can do a quick check and then upload a photo if you think it will help.

                                      Comment

                                      • vinceroger69
                                        Badcaps Legend
                                        • Mar 2012
                                        • 6714
                                        • uk

                                        #59
                                        Re: eax64905001 No Pfc Help ?

                                        maybe best to start a new thread in the tv section with tv model number etc post what you have checked already and post some clear pictures of the tv include one showing how all the boards are connected

                                        Comment

                                        • budm
                                          Badcaps Legend
                                          • Feb 2010
                                          • 40746
                                          • USA

                                          #60
                                          Re: eax64905001 No Pfc Help ?

                                          Originally posted by CostasCostas
                                          I tested all the regular test points on the t-con board and they were fine. I checked the t-con fuse for continuity although I'm not sure if I actually checked for 12V.
                                          I can do a quick check and then upload a photo if you think it will help.
                                          So the VGH, VGL, etc. are all OK?
                                          Start new thread with good, clear, and well focused pictures will help.
                                          Never stop learning
                                          Basic LCD TV and Monitor troubleshooting guides.
                                          http://www.badcaps.net/forum/showthr...956#post305956

                                          Voltage Regulator (LDO) testing:
                                          http://www.badcaps.net/forum/showthr...999#post300999

                                          Inverter testing using old CFL:
                                          http://www.badcaps.net/forum/showthr...er+testing+cfl

                                          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                          http://s807.photobucket.com/user/budm/library/

                                          TV Factory reset codes listing:
                                          http://www.badcaps.net/forum/showthread.php?t=24809

                                          Comment

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