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LG 42LB5500 TV Not Turning On: Status Light Blinks Twice, Power Supply Voltages Compliant

Awdek 18201 16
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  • #1 16124908
    Awdek
    Level 11  
    Hello
    I have a problem with the TV, namely TV, I do not want to turn on
    I have measured all voltages on the power supply and are compliant.
    No, I can not find a service for him, if someone had it, I would be very grateful. I will add that immediately after turning on the plug, the status light will blink 2 x and go off. Maybe someone knows this error code.

    Added after 1 [hours] 35 [minutes]:

    I found a service from 32 "but it is different with signs
    Attachments:
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  • #2 16125426
    Awdek
    Level 11  
    It seems to me that the LED backlighting is damaged. Can you check the led without dismantling the matrix?
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  • #3 16125505
    buli1
    Level 25  
    Awdek wrote:
    It seems to me that the LED backlighting is damaged. Can you check the led without dismantling the matrix?


    You think???

    And what a problem, check the operation of tv, for example, by connecting an external decoder through the euro and you will know if the tv is running ... as you will have a voice and no picture is probably logical with something wrong with the backlight.
  • #4 16125510
    lisek
    Service technician RTV  
    For me, this model was on the main album described as
    Quote:
    MAIN BOARD
    pcb: EAX65361503 (1.0) / EAX65361505 (1.0) >>> EBT62973012, chassis LD44B for LG 42LB5500
    * also used on pcb: Eax65359104 (1.1)

    T-con 6870C-0480A
    LG 42LB5500 TV Not Turning On: Status Light Blinks Twice, Power Supply Voltages Compliant

    SM for this chassis is poor, I will tomorrow (see if there is no forum)
    - extended by the Repair process (additional 14 pages with, for example, fault algorithms)
    LG 42LB5500 TV Not Turning On: Status Light Blinks Twice, Power Supply Voltages Compliant

    ________________
    For interesting SM is also under the chassis LD43B

    LG LED 42LB551V
    - chassis: LD43B / LB43T
    - Main: pcb: EAX65388003 (1.0) EBR78630004
    * CPU: LGE213

    Panel: LC420DUE (FG) (A5) and T-CON: 6870C-0480A V14

    Power Supply (PSU): EAX65423701 (1.9) LGP3942-14PL1 P / N: 3PCR00439A

    PWM Power: MAP8800 (PFC), FA6A01N (PWM)
    LED driver (backlight): with integrated PSU; 208V 250mA
    PWM LED driver: BD9486F
  • #5 16125718
    Awdek
    Level 11  
    To Buli1. The problem is that the tv will not start when the bd9486f scalpel that answers for the backlight control detects an error. He controls the current and voltage on the LEDs. I had such a case at Sony.
  • #6 16126002
    buli1
    Level 25  
    Awdek wrote:
    problem in that the tv will not start when the bd9486f scalpel that answers for the backlight control detects an error. He controls the current and voltage on the LEDs. I had such a case at Sony.


    hmmm. I will not argue. but do not compare sony to lg ....
    sony - I agree with this that I control myself and check before starting the tv.
    lg - I do not think ... (but I'm not an expert)

    And how to check Ledy without undressing the matrix? hmm power supply or LED tester, of course, by properly connecting. (by setting the appropriate voltage for the power supply).
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  • #7 16126706
    Awdek
    Level 11  
    I managed to determine that there is definitely no backlight. Does anyone have this schematic of the power supply?

    Added after 32 [minutes]:

    shorting the DrvON through the resistor to the ground showed the voltage at the pins for backlight oscillates between 130-190 V. But ledy still do not shine. I wonder if it is necessary to bring a PWM signal. LG 42LB5500 TV Not Turning On: Status Light Blinks Twice, Power Supply Voltages Compliant
    Attachments:
  • #8 16126815
    buli1
    Level 25  
    Awdek wrote:
    shorting the DrvON through the resistor to the ground showed the voltage at the pins for backlight oscillates in the range of 130-190 V. But ledy still do not shine.


    hmm no, I think you have an answer ... or not.
    Is something standing in the way and to check Ledy?
  • #9 16126827
    Awdek
    Level 11  
    I would like to Be Sure it just led me to take care of undressing the matrix. It is known that this is a pretty dangerous :) treatment
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  • #11 16127155
    Awdek
    Level 11  
    The die is dismantled
    Damaged 4 LEDs

    Added after 1 [minutes]:

    To Colegade Dejwid Koperfilc
    Can you develop your thought?
  • #12 16127439
    buli1
    Level 25  
    Awdek wrote:
    The die is dismantled
    Damaged 4 LEDs


    hmmm ... and yet .....

    replace them with new ones.
  • #13 16127457
    Awdek
    Level 11  
    I am looking for a List. I'll let you know after the exchange
  • #15 16127964
    Awdek
    Level 11  
    I was thinking about replacing the same "eyes" but I can not find the specifications of these slats anywhere. And as you know there are different parameters of LEDs. For example, color temperature, light quantity, etc. Well, unless my friend can advise me something. My slats are:
    LG INNOTEK DRT 3.0 42 "
  • #16 16128302
    buli1
    Level 25  
    These slats are available new on Allegro ...
    I have same LEDs, as something PW, I can also replace.
  • #17 16130435
    Awdek
    Level 11  
    I replaced Tv. Sail. Thank you for your help. Regards
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Topic summary

The discussion revolves around an LG 42LB5500 TV that fails to power on, indicated by a status light that blinks twice before turning off. The user has confirmed that all power supply voltages are compliant but is seeking assistance in diagnosing the issue. Responses suggest that the problem may be related to damaged LED backlighting, with recommendations to test the TV using an external decoder to check for sound without picture. Technical details about the T-con board (6870C-0480A) and power supply components are shared, along with troubleshooting steps involving checking the LED backlighting and PWM signals. The user ultimately discovers that four LEDs are damaged and seeks specifications for replacements, noting that the LED strips are LG INNOTEK DRT 3.0 42". The discussion concludes with the user successfully replacing the damaged components.
Summary generated by the language model.
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