Hisense 40K360MN dim picture like in power saving mode

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • CapLeaker
    Leaking Member
    • Dec 2014
    • 7975
    • Canada

    #21
    Re: Hisense 40K360MN dim picture like in power saving mode

    Did you check it if there is a short to ground maybe?

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #22
      Re: Hisense 40K360MN dim picture like in power saving mode

      I will have to download the picture and start tracing this weekend, I may ask for more closed up pictures later on.
      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

      • nortnil
        Member
        • Jul 2008
        • 40

        #23
        Re: Hisense 40K360MN dim picture like in power saving mode

        Sounds great, thanks budm!!!

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #24
          Re: Hisense 40K360MN dim picture like in power saving mode

          "I was also wondering about C869 having 0VCD when I measured using the chassis as ground." OK, I took a quick look at the circuit around C869, it is not ref. to the chassis GND so you need to measure directly right at the two legs.
          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

          • nortnil
            Member
            • Jul 2008
            • 40

            #25
            Re: Hisense 40K360MN dim picture like in power saving mode

            Okay, thank you for looking. Right at the legs I got 138VCD then.

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #26
              Re: Hisense 40K360MN dim picture like in power saving mode

              OK, I traced out the board, the LED STRINGS are connected in series to form one long string, so if you measure the Voltage between point A and Point B when the TV is first turned on, you should see very high Voltage and if you disconnect the LED connector and do the measurement again, the Voltage should also shows the same readings.
              Attached Files
              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

              • nortnil
                Member
                • Jul 2008
                • 40

                #27
                Re: Hisense 40K360MN dim picture like in power saving mode

                Wow, you did that fast.

                From A to B with the LED connected it shot right to 460VCD and then moved to 463VCD and stabalized shortly after

                With the LED connector disconnected I got 467VCD.

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #28
                  Re: Hisense 40K360MN dim picture like in power saving mode

                  OK, the LED strings has open connection either at the connectors inside the panel or the LED inside the panel.
                  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

                  • nortnil
                    Member
                    • Jul 2008
                    • 40

                    #29
                    Re: Hisense 40K360MN dim picture like in power saving mode

                    Okay I guess it is time to take this thing apart. Any tear down guides I should look at first, or any general tips I should be aware of?

                    Comment

                    • budm
                      Badcaps Legend
                      • Feb 2010
                      • 40746
                      • USA

                      #30
                      Re: Hisense 40K360MN dim picture like in power saving mode

                      They are no standard on how the panel is put together so I have no suggestion for this one.
                      BTW, who sells this brand? WALMART?
                      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

                      • nortnil
                        Member
                        • Jul 2008
                        • 40

                        #31
                        Re: Hisense 40K360MN dim picture like in power saving mode

                        Yeah I think so. My friend gave it to me after it crapped out to tinker with.

                        Guess it's time to go slow and carefully. I'll report back what I find.

                        Comment

                        • nortnil
                          Member
                          • Jul 2008
                          • 40

                          #32
                          Re: Hisense 40K360MN dim picture like in power saving mode

                          Originally posted by budm
                          OK, the LED strings has open connection either at the connectors inside the panel or the LED inside the panel.
                          Wuahaha WOW!!! I was not prepared for the front glass/actual LCD panel to come off from the backlight like that!

                          You sir are a genius!!! One of the LED strips was slightly unplugged. I plugged it back in and now it is up and running again. (I just realized I probably should have put some tape or glue on that while I was in there)



                          Do you have a paypal or something I can make a donation to? I would like to buy you a beer.

                          Thank you again for all of your help!!!!
                          Attached Files

                          Comment

                          • budm
                            Badcaps Legend
                            • Feb 2010
                            • 40746
                            • USA

                            #33
                            Re: Hisense 40K360MN dim picture like in power saving mode

                            Nice, that was fast, only 32 threads. Did yo take the pictures of the connectors? I am sure there are more out there with the same problem like this one.
                            Glad to hear it did cost any money for parts.
                            It looks small for 40" TV.
                            Last edited by budm; 03-06-2015, 06:36 PM.
                            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

                            • nortnil
                              Member
                              • Jul 2008
                              • 40

                              #34
                              Re: Hisense 40K360MN dim picture like in power saving mode

                              No I planned to, but I started to freak out about dust once I saw how the layers separated. So I tried to move as efficiently as possible.

                              Basically the LED cable going into the panel itself separates into two pairs, blue and black and red and white, that terminate into little two prong molex connectors. On the right side (from the front of the TV) is the LED strip. One plug goes to the top, and the other to the bottom. The one at the top was visibly askew.

                              I plugged it back in and then hooked the power supply, logic board, and power switch up and plugged in the LED power connector to test. In my usual fashion I stared right at the lights to make sure they were working and damn near blinded myself when they came on.


                              As far as the disassembly, there were about 15-20 small screws that held the front black bezel to the LCD panel. That was what was holding the LCD glass to the backlight.

                              From there, there were only 4 screws on the bottom of the backlight panel that held the plastic rim on outside of the plastic snaps. I went around and freed all of the snaps and the metal back lifted straight off. I tested it, blew off the back sheet with compressed air, and dropped the metal back on and quickly put it back together.

                              From a quick visual I don't think I got any smudges or dust inside or around the edges of the panel.

                              Comment

                              • CapLeaker
                                Leaking Member
                                • Dec 2014
                                • 7975
                                • Canada

                                #35
                                Re: Hisense 40K360MN dim picture like in power saving mode

                                Not too long ago there was another thread with exact the same problem. The cable to the LEDs wasn't plugged in properly.

                                Comment

                                Related Topics

                                Collapse

                                • petersor
                                  Hisense 58R6E3 Backlight/No Picture Repaired
                                  by petersor
                                  Quick repair summary for those interested. I had a Hisense 58R6E3 TV that had backlights working but no picture. T-Con had 12V supply but some of the supplies on the board were 0V. Unplugging one of flat cables to the LCD display driver boards brought the supplies back up, so I figured it was a short on the LCD panel driver board. Narrowed the short down to the 15V power supply by checking the coils on the T-Con board to ground with a diode test and confirmed that all the MLCC caps on that rail all showed a short to ground. I injected 5V/1A into the 15V rail on the driver board (T-Con disconnected)...
                                  06-07-2024, 04:16 PM
                                • momaka
                                  Seasonic B12 BC-550 – barely 2 years old and with BAD CAPS already!
                                  by momaka
                                  I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.

                                  For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).

                                  https://www.badcaps.net/filedata/fetch?id=3591771


                                  https://www.badcaps.net/filedata/fetch?id=3591772

                                  It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:

                                  https://www.badcaps.net/filedata/fetch?id=359177...
                                  03-12-2025, 03:42 PM
                                • Tr0ll
                                  T-con suspect issue. Both ribbon cables no picture. One ribbon cable ok. (58pus8545)
                                  by Tr0ll
                                  Hi guys! I realized you have a lot of knowledge here so i am hoping you could point me in right direction with my odd issue.

                                  The Tv is a Philips 58PUS8545/12, it had no picture but working backlights.

                                  Original T-con:
                                  Opened the Tv and tested to unplug one ribbon cable at a time. With this test i could see that i got fine picture on both halves as long as there was only one ribbon cable connected, with two connected picture were gone.

                                  First replacement T-con:

                                  I thought it might be t-con and ordered new t-con from china(supposedly tested)...
                                  10-07-2023, 07:48 PM
                                • TVGuy419
                                  Hisense 75R6E3 No Picture
                                  by TVGuy419
                                  I replaced the backlights on this Hisense TV and the LEDs were showing on certain images. Drove me nuts, so pulled it apart, got new LEDs and put it back together. Now I don't have a picture. TV came apart very easily both times and I was very carful with the panel. I've replaced all the boards for good measure and still have the same issue. Unhooking either side of TCON board still gives me a blank screen with backlights and sound. Is it really possible the panel is junk just from taking it off with suction cups and gently placing it back in place?
                                  11-09-2023, 06:38 AM
                                • JJAAMM
                                  SAMSUNG UN55KS9000F picture fades then distorts into vertical lines after 20 seconds
                                  by JJAAMM
                                  This was my main TV for the last 6 years. I'm not inclined to throw out a $2600 TV so quickly so I'm trying to investigate the issue.

                                  Problem
                                  TV was disconnected from power for 6 months during construction. When I plugged it yesterday picture was fine, after 30 seconds it dimmed then started developing horizontal lines, picture then starts to ghost vertically until it degrades into vertical streaks. TV always displays a perfect picture when cold. I can unplug TV for 5 minutes and plug it back in and picture is restored for 20 seconds. I can also keep it in standby mode...
                                  07-06-2023, 06:01 AM
                                • Loading...
                                • No more items.
                                Working...