TCL LCD TV L32M11HD no standby

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  • t4796
    Senior Member
    • Feb 2015
    • 79
    • Australia
    #1

    TCL LCD TV L32M11HD no standby

    Hi,

    I have a TCL 32" LCD on the bench. No standby 3.3v

    I do not have stable voltage on pin4 Vdd of IC1 VIPER12A (with respect to AGND)

    Schematic is attached, pictures of standby section now attached.
    Attached Files
    Last edited by t4796; 11-14-2015, 11:12 PM.
    Tags: None
    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA
      #2
      Re: TCL LCD TV L32M11HD no standby

      ESR and the capacitance of C84 tested OK?
      D810 tested OK?
      ZB6 tested OK?
      DCV reading on C84?
      Last edited by budm; 11-14-2015, 11:27 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

        • t4796
          Senior Member
          • Feb 2015
          • 79
          • Australia
          #3
          Re: TCL LCD TV L32M11HD no standby

          Thanks for the reply. I've taken the following measurements:

          Originally posted by budm
          ESR and the capacitance of C84 tested OK?
          CB4 - 21.14uF on meter I do not have ESR meter
          Originally posted by budm
          D810 tested OK?
          measures 1.078k (meter - to cathode) and 0.077M (meter + to cathode)
          Originally posted by budm
          ZB6 tested OK?
          measures 1M+ (rising on meter) (meter - to cathode), 0.676V in diode check mode and Open (meter + to cathode)
          I didn't remove ZB6 to test because it was surface mount. I desoldered pin 5 IC1 which hopefully isolated that side.
          Originally posted by budm
          DCV reading on C84?
          19.55VDC
          Last edited by t4796; 11-15-2015, 12:42 AM.

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