LT26MC1A with a 715T2907-2 psu

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  • hifiguy
    Geoff Scott
    • Jun 2011
    • 12
    #1

    LT26MC1A with a 715T2907-2 psu

    Any help would be appreciated on a BUsh LT26MC1A with a 715T2907-2 psu.

    The set responds to remote or manual switch on IE The standby light switches from red to blue and that's it, no backlight no sound. I have to switch off at mains to get back to standby.

    Upon inspection I found the 12v reg IC had failed. After extensive searching I obtained and fitted a new one which has got the 12v back up but the set behaves the same. I'm thinking eeprom corruption. Any thoughts?

    Cheers
    Geoff
    Tags: None
    • tom66
      EVs Rule
      • Apr 2011
      • 32560
      • UK
      #2
      Re: LT26MC1A with a 715T2907-2 psu

      On my Lexsor TV, this was caused by a dud diode in one of the switching regulators on the main board. Test all diodes on the switching supply for a short or open circuit using a multimeter.
      Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
      For service manual, schematic, boardview (board view), datasheet, cad - use our search.

        Comment

        • hifiguy
          Geoff Scott
          • Jun 2011
          • 12
          #3
          Re: LT26MC1A with a 715T2907-2 psu

          I need to get this one back on the bench. I'm pretty sure I checked all diodes but it's worth another look.
          Thanks Tom
          Last edited by hifiguy; 09-15-2011, 11:14 AM.

            Comment

            • vinceroger69
              Badcaps Legend
              • Mar 2012
              • 6714
              • uk
              #4
              Hi i have just been given this set its dead no standby light it has 336 v dc on mains cap zero volts on any of the secondary rails where do i start fault finding i have linked the psu schematic thanks
              Guys which pins do i need to join with 1k resistor too bench test the psu.
              Attached Files
              Last edited by vinceroger69; 04-29-2024, 05:18 AM.

                Comment

                • vinceroger69
                  Badcaps Legend
                  • Mar 2012
                  • 6714
                  • uk
                  #5
                  R_J do you have any ideas thanks

                    Comment

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