Backlight, but no video on Panasonic TC-L39EM60 LCD TV

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • SurrealMustard
    Badcaps Veteran
    • Jan 2015
    • 486
    • The United States of America
    #1

    Backlight, but no video on Panasonic TC-L39EM60 LCD TV

    I'm working on this Panasonic LCD and it's really got me stumped. It'll power on and light up the backlight, but nothing appears on the screen. It isn't locked up, as it can still be powered off by way of the power button, but what I don't know if any sound is playing or not. I tried replacing the mainboard, but ended up with the same problem.

    The power supply is putting out good voltage on all of its rails and reading 4Volts at PWON and 3.3Volts at ACD, DIM, and BLON. Any ideas as to what the problem could be?
    Attached Files
    Tags: None
    • vinceroger69
      Badcaps Legend
      • Mar 2012
      • 6714
      • uk
      #2
      Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

      what voltage do you get on each side of the tcon board i also see that this set has the tcon on the bottom of the panel i hope someones not used liquid claener on the screen and its damaged the panel pcb/tab bonds

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa
          #3
          Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

          Disconnect one ribbon at a time and see if you get picture
          I assume no responsibility for any stupid suggestions I might post.

            Comment

            • Andrew F. Ali
              Badcaps Legend
              • Jan 2014
              • 2450
              • Trinidad & Tobago
              #4
              Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

              Originally posted by vinceroger69
              what voltage do you get on each side of the tcon board i also see that this set has the tcon on the bottom of the panel i hope someones not used liquid claener on the screen and its damaged the panel pcb/tab bonds
              +1.. What voltage are you getting on each side of the fuse?...Should be 12Vdc.
              Last edited by Andrew F. Ali; 04-18-2017, 02:05 PM.

                Comment

                • SurrealMustard
                  Badcaps Veteran
                  • Jan 2015
                  • 486
                  • The United States of America
                  #5
                  No video, but 12.9volts on the T CON

                  Originally posted by dskall
                  Disconnect one ribbon at a time and see if you get picture
                  Nothing. At least when disconnecting the ribbons going from the T CON to the panel one-at-a-time.

                  Originally posted by vinceroger69
                  what voltage do you get on each side of the tcon board i also see that this set has the tcon on the bottom of the panel i hope someones not used liquid claener on the screen and its damaged the panel pcb/tab bonds
                  Originally posted by Andrew F. Ali
                  +1.. What voltage are you getting on each side of the fuse?...Should be 12Vdc.
                  Strong voltage on both sides of the fuze.

                    Comment

                    • dskall
                      Badcaps Legend
                      • Oct 2016
                      • 2905
                      • usa
                      #6
                      Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

                      I would be checking various voltages on t-con
                      I assume no responsibility for any stupid suggestions I might post.

                        Comment

                        • Andrew F. Ali
                          Badcaps Legend
                          • Jan 2014
                          • 2450
                          • Trinidad & Tobago
                          #7
                          Re: Backlight, but no video on Panasonic TC-L39EM60 LCD TV

                          The five top voltages to be checked for a healthy T-CON are:
                          1. Vin (Vcc): 12Vdc or 5Vdc
                          2. Vdd (Vlogic, Vddd): 3.3Vdc
                          3. Vda (Vs, Vsource, Vdda,Avdd): 14Vdc~20Vdc
                          4. Vgh (Vgon, Von, Vddg): 20Vdc~30Vdc
                          5. Vgl (Vgoff, Voff, Veeg): -5Vdc~-7Vdc

                            Comment

                            • SurrealMustard
                              Badcaps Veteran
                              • Jan 2015
                              • 486
                              • The United States of America
                              #8
                              Fixed!!

                              T-CON it was! Everything is in working order now; Thanks for the tips.

                              Now, to see about returning that mainboard...

                                Comment

                                Previous template Next

                                Related Topics

                                Collapse
                                • Max514
                                  Samsung UN55H8000 sound but no backlight no video
                                  by Max514
                                  Hi all,

                                  Ok so I have this beautiful un55h8000 samsung tv with sound but no video nor backlight. When turning the set on the red light blinks 5 times.

                                  The screen shows no damage and backlight turns on when I disconnect the power supply from the main board. The tcon board only has 2 out of 3 leds on.

                                  I came across this page and followed the different steps: https://techhometravel.com/samsung-u...ight-no-video/
                                  • Unplugging the main board cable at the power supply >>> backlights came on.
                                  • BLU_ON signal from the
                                  ...
                                  04-14-2022, 10:34 AM
                                • JaquesPratt
                                  Vizio D32f-E1 Powers on, has backlight, won't boot/no logo, no menu or video
                                  by JaquesPratt
                                  I have a Vizio D32f-E1 LCD TV that does NOT have a TCON board.

                                  This TV recently went through some 'death throes' and now won't boot. The first problem that began to manifest was while watching tv, the screen would 'freeze', and the image would dim over a few seconds until it was very dark. HOWEVER, the audio of the show would continue as normal. I could power off the TV for 5-20 seconds, power back on, and the video would be normal. This would occur 1-3 times when the TV was first started, and would not happen again after the TV was 'warmed up'. Not ideal, but this glitch was manageable....
                                  07-16-2024, 01:04 AM
                                • signal.quest
                                  Panasonic LED TV TC-40A420U - Replaced Backlight LEDs but now no image/display or garbled
                                  by signal.quest
                                  I have a Panasonic LED TV TC-40A420U. The TV was given to me as an attempt to fix or throw out. I replaced the Backlight LEDs and now the screen lights up, but there is no image/display. If I play with the up/down buttons I can get the display to change from black to garbled. I can't get sound from HDMI but not sure of what input is selected. I have no remote control. When I connect a laptop to the HDMI ports it recognizes a Panasonic TV for display and sound output but I can't see or hear anything through the TV. This makes me think the mainboard is OK, but not sure if mainboard can...
                                  2 Photos
                                  03-17-2024, 10:14 AM
                                • Document Archive
                                  HP EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera EliteDesk 800 i7-7700 Specification for Upgrade or Repair
                                  by Document Archive
                                  This specification for the HP EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera boardview and EliteDesk 800 G3 + GoPro HERO6 Black 4K Ultra HD Video Camera schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our...
                                  09-12-2024, 02:00 PM
                                • triplefour
                                  UN65TU700DF picture and sound but no backlight. BL tests ok but repl. PSU didnt fix!
                                  by triplefour
                                  this tv is throwing me for a loop. do samsung tvs no longer have the backlight self test feature built into the power supply?
                                  i tested the backlight with my LED tester and it lights up both strips. one of them reads 100v and the other reads 63.7v.
                                  unplugged mainboard from power supply but left backlight plugged in, and then plugged psu wall power in. expected to see backlights light up but see nothing.
                                  according to how ive diagnosed in the past, this would almost always be a bad power supply. replacement power supply was cheap like 20$ from ebay. but still i get not even...
                                  09-13-2023, 10:43 PM
                                • Loading...
                                • No more items.
                                Working...