Vestel turns on ok but dim picture after 1 minute

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • PowerAmpFreak
    Badcaps Veteran
    • Feb 2010
    • 977
    • Sweden

    #1

    Vestel turns on ok but dim picture after 1 minute

    This Vestel turns on OK, but after one minute suddenly backlight goes very dim, set continue working with sound and possible to control by remote.

    According to owner, by pressing teletext button could bring back picture.

    Sounds like corrupt eeprom or similair in my ears, what do you say guys?
    Attached Files
  • vinceroger69
    Badcaps Legend
    • Mar 2012
    • 6714
    • uk

    #2
    Re: Vestel turns on ok but dim picture after 1 minute

    does the BL ON voltage drop when the backlight goes dim what board numbers are used in this set?

    Comment

    • dick_barton
      Badcaps Legend
      • Aug 2015
      • 6642
      • Wales

      #3
      Re: Vestel turns on ok but dim picture after 1 minute

      Originally posted by vinceroger69
      does the BL ON voltage drop when the backlight goes dim what board numbers are used in this set?
      +1 Or the DIM voltage?
      Willing to help but I'm no expert.

      Comment

      • PowerAmpFreak
        Badcaps Veteran
        • Feb 2010
        • 977
        • Sweden

        #4
        Re: Vestel turns on ok but dim picture after 1 minute

        Both DIM voltage and BL ON voltage is OK when screen dims.
        Forget about the corrupt eeprom thought I had initially. It must be the LED driver module then.

        Comment

        • dskall
          Badcaps Legend
          • Oct 2016
          • 2905
          • usa

          #5
          Re: Vestel turns on ok but dim picture after 1 minute

          Whole screen dims? What are voltages to leds
          I assume no responsibility for any stupid suggestions I might post.

          Comment

          • PowerAmpFreak
            Badcaps Veteran
            • Feb 2010
            • 977
            • Sweden

            #6
            Re: Vestel turns on ok but dim picture after 1 minute

            Whole screen dims. The high side of the LED supply goes down to +24V (from +50V when screen is bright)
            The two driver IC's to the right of the PCB gets really hot.
            Attached Files

            Comment

            • dick_barton
              Badcaps Legend
              • Aug 2015
              • 6642
              • Wales

              #7
              Re: Vestel turns on ok but dim picture after 1 minute

              With the leds disconnected what led driving voltage do you have?
              Willing to help but I'm no expert.

              Comment

              • PowerAmpFreak
                Badcaps Veteran
                • Feb 2010
                • 977
                • Sweden

                #8
                Re: Vestel turns on ok but dim picture after 1 minute

                LED voltage goes to +53,5V, but soon turned off due to protection.
                But I will take a look on the quick heat-up driver IC's.

                Comment

                Related Topics

                Collapse

                • burbutsalos
                  55" QLED QE55Q60T Turns on after 1 minute the picture goes bad and get in boot loop
                  by burbutsalos
                  Hello ,
                  The issue with this set is that it turn on just fine and after a minute or so the picture shows either vertical lines or turns half black and from that point on starts a boot loop.
                  If a let the unit to cool down for a minute the same pattern starts again. i had exactly the same mainboard as a spare and replaced it but nothing changed.

                  Any ideas what to check?...
                  12-12-2023, 06:06 AM
                • Kambi13
                  Dell Inspiron 3542 Turns on works for 30 seconds to 1 minute then turns off
                  by Kambi13
                  Hi all need some help, I've got a Dell insprion 15 3542 that turns on works for about 30 seconds or sometimes a minute or two and then turns off and wont turn on again until I remove and replug the power connector
                  Not heat related, everything is ok regarding to that.
                  All voltages are present.
                  Wondering if this as anything to do with one wire circuit, the charger is not original, but it was working fine
                  Motherboard is Cedar 13269-1 F3XMC Rev A00...
                  07-12-2024, 06:10 AM
                • ItepK
                  LG 32LG3000 TV, three red light flashes, then the backlight turns on, but no picture
                  by ItepK
                  Hello everyone! I've found this television, and I began troubleshooting it.

                  First, the television kept rapidly power cycling. I've warmed up the capacitors with a hairdryer, and after 3 dimmed red blinks, the backlight turned on, then turned dim, and no picture was present on the screen.

                  I believed that this was caused by a bad power supply producing insufficent power (I've measured 3.5v on the 5.2v rail), so I've blindly recapped the board.

                  After the recapping, all the voltages stableized, however, the issue in the title still remains.

                  I could...
                  01-03-2025, 09:01 AM
                • 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
                • 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...