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[Solved] Sony KDL-40R470A - No picture, the backlight is working, the LED is on normally

bator90 10602 12
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16516581
    bator90
    Level 11  
    Hello.

    The TV is blank. The backlight turns on. The matrix is not mechanically damaged and pressing the tapes does not give anything. Detaching the tape from the integrated T-con does not change anything. Up to tcon comes 12v. The LED lights normally, it responds to the remote control. Please help

    Sony kdl-40r470a TV set.
    Matrix: foxconn s400dh1-3
    APs-349 power supply
    Main 1p-012cj01-4010
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  • #2 16516693
    lisek
    Service technician RTV  
    This is a model on a strange RB1FK chassis, cpu: MT5367
    Up to tcon comes 12v
    What's next, what about other voltages on T-con? (* 3.3V / 1.5V / Voff / Vone ...)
    T-con on
    - LQF6041TOB-Q1, RT6503A, BM81204

    There was something on the forum recently.
    * BM81204
    Link
  • #3 16516737
    bator90
    Level 11  
    I checked but did not save. When I return home, I will check what values had, but from what I remember it is incorrect, probably 1.5 was 0.2 and 3.3 was also disturbed

    Added after 8 [hours] 25 [minutes]:

    The left side is the set point and the right side is the actual value


    Vcc 3.3v - 0.21v
    Vcc 1.2v - 0v
    Vin 12v - 12.29v
    Vini-12 - 12.29v
    Vcc 1.8v - 0v
  • Helpful post
    #4 16517946
    lisek
    Service technician RTV  
    Read about it BM ..
    Usually, replacing the T-con helped if the matrix is OK.

    This is the second "flawed" problem with this TV.
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  • #5 16518168
    bator90
    Level 11  
    But how to replace tcon if it is attached to the matrix on tapes?
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  • Helpful post
    #6 16518350
    lisek
    Service technician RTV  
    There are companies that replace it, having the appropriate .. equipment.
    We are "tiny" replacing components.

    ________________________________

    APS-349 (CH) GL4 / ASP-348 power supply
    - MIP2H2 (Standby),
    - CXA3810M (PFC & PWM resonant) + field KF11N50F (PFC), KF5N50FZA.
    * LED driver (backlight): integrated into PSU
    - LED driver: BD9488F
    * for this LED backlight matrix: SVG400A81_REV 3_121114

    MainBoard: p / nr. Sony: 1-895-375-51 (1P-012CJ01-4010)

    I have an SM somewhere under the chassis / PSU // as needed
    * I will see if they are in the base, I will not drop it
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  • #7 16520433
    bator90
    Level 11  
    I do not know what to do, I am not a service technician, but I would like to play with our friendly service in Olsztyn. No risk because I have TV for free

    Added after 47 [seconds]:

    The TV just didn't turn on one day.
  • Helpful post
    #8 16521339
    lisek
    Service technician RTV  
    I added SM Link

    SM for APS-349, 348, 350 power supply Link
  • #9 16611922
    bator90
    Level 11  
    What about the bm81204. I gave the motherboard to be repaired but still the same
  • Helpful post
    #10 16611999
    mirex
    Level 43  
    Listen to the fox! Give the matrix to repair. They are ... how it was ...
    lisek wrote:
    There are companies that replace it, having the appropriate .. equipment.
  • #11 16612112
    bator90
    Level 11  
    And someone will tell me where are these "large companies"? And will the replacement of the bm81204 alone do nothing?
  • Helpful post
    #12 16612204
    mirex
    Level 43  
    bator90 wrote:
    And someone will tell me where are these "large companies"?

    the fox will tell you.
    bator90 wrote:
    And will the replacement of the bm81204 alone do nothing?

    He will tell you too. It will or will not. ;)
  • #13 17901521
    bator90
    Level 11  
    I threw this crap out. CLOSING
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Topic summary

The Sony KDL-40R470A TV is experiencing a blank screen issue despite the backlight functioning normally. The user confirmed that the matrix is undamaged and that the T-con board receives 12V, but other voltages (3.3V and 1.2V) are abnormal. Suggestions from forum members include checking the T-con board voltages and considering its replacement, as it is often a common solution for similar problems. The user expressed uncertainty about replacing the T-con due to its attachment to the matrix. Additional discussions highlighted the need for professional repair services for the matrix and T-con components, with references to specific power supply and mainboard models.
Summary generated by the language model.
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