LE40A456C2D, no picture

Collapse
X
Collapse
 
  • Page of 1
  • Time
  • Show
Clear All
new posts
Previous template Next
  • amennone
    Senior Member
    • Feb 2015
    • 63
    • italy
    #1

    LE40A456C2D, no picture

    Main -Board BN41-00980B
    Power BN44-00197B
    T-con T400XW01 V5
    Defect: Lighting o.k., audio o.k. no image, scart output image ok.

    The F01 fuse is blown, the cause is due to U101 = tps65161 broken. After replacing the U101, I have the following voltage values on the T-CON:
    AVDD = 15V
    VGL = -6V1
    VGMA1 = 15V
    VGH = 27V pin 1 of U103 = RT8901
    VGHC = 0V
    V1D8 = 1v8
    V3D3 = 3v3
    The VGHC is not present (output from pin 2 of U103 = RT8901). With the replacement of the U103, still no voltage
    VGHC.
    I gave 24v on the VGHC point, colored vertical lines on the screen, no image.

    Voltage measurements U103 = RT8901

    pin
    1 = 27V 8 = 0V
    2 = 0V 7 = GND
    3 = 0V 6 = 4v9
    4 = 3v3 5 = 1V

    I enclose the diagram of the T-con, even if it partially corresponds to that of the T-con in question.
    Thanks and good job.
    Attached Files
    Tags: None
    Previous template Next

    Related Topics

    Collapse
    • Fly_Among_Stars
      VIZIO E70-E3 Half picture with half TCON
      by Fly_Among_Stars
      Hi,
      I have a VIZIO E70-E3.
      Symptoms: Black screen, no picture, but LED backlights are working.
      I probed the power board and voltages are as listed on the board.
      Main board appears fine, too.
      I believe the problem is either a bad T-CON board, or connection to LCD, or bad LCD.
      There are two separate ribbon cables feeding the LCD.
      If both are connected, the screen is black.

      If only the ribbon cable that feeds the right side of the screen (when viewed from the front) is disconnected, the left side of the screen shows picture and...
      04-24-2023, 08:20 PM
    • iglitare
      Sony KD-75XF9005 grey Picture but Sound. TCON or panel?
      by iglitare
      Hi,

      i want to repair a Sony KD-75XF9005 TV that initially only showed a grey picture.
      Backlight seems to work, Sound (Setup menu after reset) works.
      If i dissconnect the left FFC cable from TCON to panel i have half a screen on the right. If left cable is connected always only the grey screen.
      Interchanged the cables, its always only the right side that is working. Always grey if left side is connected.
      With my small knowledge i would think at least the cables are good.

      Can this happen because of a bad tcon board?
      Or is it always a bad/shorted...
      09-04-2025, 07:13 AM
    • shelby5041
      Samsung LCD TV no picture backlight on no 12v at tcon
      by shelby5041
      hi
      i have a samsung lcd tv

      it powers on with sound and backlight but no picture

      all voltages from PS are good 12v 3.3v and 5v

      whats odd is that at the tcon i tested voltage across the fuse on the tcon and i get 0v

      i figured main board issue..so i ordered a used main board....when i put replacement main board in i still have same issue

      no 12v at the tcon fuse

      i disconnect the panel ribbon cables to rule out any panel issues and i still have no 12v at the tcon fuse

      the odds of having 2...
      10-08-2021, 08:21 AM
    • x_orange90_x
      TCL 50S535 bad tcon or panel issue?
      by x_orange90_x
      Just bought this for 10 bucks yesterday hoping to fix it. The guy said water dropped inside from a dehumidifier hose and it started showing black and white vertical bars then went blank. When I got it home and turned it on it came on fine and displayed correctly but I was noticing faint vertical bars in the image. After a little bit I turned it off and back on and it was a black screen again. I opened it up to check for water damage and corrosion but didn't find anything of the sort. I cleaned the ribbons anyway and reconnected them but still got a blank screen. If I disconnect the right side...
      03-29-2025, 11:02 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
    • Loading...
    • No more items.
    Working...