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Panasonic TX-L42B6E TV Not Powering On: Matrix Flashing After Replacing TNP4G549 Capacitors

Bieri13 6435 9
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  • #1 16467175
    Bieri13
    Level 11  
    Hello,
    I have a problem with the Panasonic TX-L42B6E LCD TV. When you try to start the TV, the matrix flashes (blinks) and turns off after a while.
    What I did: I replaced the electrolytic capacitors on the TNP4G549 board. Unfortunately, no effect.
    I would like to ask for any suggestions, advice what I could possibly check or replace in order to remove the fault.

    Panasonic TX-L42B6E TV Not Powering On: Matrix Flashing After Replacing TNP4G549 Capacitors
    Panasonic TX-L42B6E TV Not Powering On: Matrix Flashing After Replacing TNP4G549 Capacitors
    Panasonic TX-L42B6E TV Not Powering On: Matrix Flashing After Replacing TNP4G549 Capacitors
    Panasonic TX-L42B6E TV Not Powering On: Matrix Flashing After Replacing TNP4G549 Capacitors
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  • #2 16467207
    wieslaw99
    Level 23  
    Leds to check.
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  • #3 16467351
    Anonymous
    Level 1  
  • #4 16468759
    Bieri13
    Level 11  
    I checked the voltage on the connectors coming out to the LEDs.
    With the leds connected, the voltage on the first pair jumps from about 48 to 85VDC.
    However, on the second pair, the voltage fluctuates up to max .: 10VDC.

    After disconnecting the first pair of LEDs, the matrix continues to blink.
    After disconnecting the second pair of LEDs, the matrix does not display anything, it does not even start.
  • #5 16468793
    LCD-LED-PDP

    Level 28  
    Undress and measure the stripes.
  • #6 16479867
    GanCegall
    Level 38  
    Bieri13 wrote:
    I replaced the electrolytic capacitors on the TNP4G549 board

    You improved the producer "a little" :-) I wonder what you changed the other two.
    I think these words describe it all:
    waniagog wrote:
    Do not check anything, return to the nearest rtv service.
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  • #7 16480111
    Bieri13
    Level 11  
    LCD-LED-PDP wrote:
    Undress and measure the stripes.


    Thanks for targeting the source of the failure.
    You were right, the LED strips are broken ...
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  • #8 16480167
    GanCegall
    Level 38  
    Bieri13 wrote:
    The LED strips are broken ...


    Well, replace it with a functional one.
  • #9 16480330
    Bieri13
    Level 11  
    There are too many of them to be replaced.
    There are 4 rows of stripes. Each row of LEDs consists of two modules, 5 LEDs each.
    For me, I have damaged single pieces and entire modules.
    For the inquisitive, he gives the designation of my belts: row2.1 rev 0.0 l1-type 6916l-1338a
  • #10 16480701
    wiesiu70
    Level 13  
    Four? Not five, if at least one "series" is flashing, you have working order
    in a non-stop sense.
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Topic summary

The Panasonic TX-L42B6E LCD TV is experiencing a power issue where the matrix flashes and turns off after a short period. The user replaced the electrolytic capacitors on the TNP4G549 board but did not achieve any improvement. Subsequent checks revealed fluctuating voltages on the LED connectors, with one pair showing 48 to 85VDC and another pair only reaching up to 10VDC. Further investigation indicated that the LED strips are damaged, necessitating their replacement. The user identified the specific designation of the LED strips as row2.1 rev 0.0 l1-type 6916l-1338a.
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