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

bator90 11736 12
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  • #1 16516581
    bator90
    Level 11  
    Posts: 89
    Rate: 52
    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  
    Posts: 39712
    Help: 6305
    Rate: 6800
    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
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  • #3 16516737
    bator90
    Level 11  
    Posts: 89
    Rate: 52
    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  
    Posts: 39712
    Help: 6305
    Rate: 6800
    Read about it BM ..
    Usually, replacing the T-con helped if the matrix is OK.

    This is the second "flawed" problem with this TV.
  • #5 16518168
    bator90
    Level 11  
    Posts: 89
    Rate: 52
    But how to replace tcon if it is attached to the matrix on tapes?
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    #6 16518350
    lisek
    Service technician RTV  
    Posts: 39712
    Help: 6305
    Rate: 6800
    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
  • #7 16520433
    bator90
    Level 11  
    Posts: 89
    Rate: 52
    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  
    Posts: 39712
    Help: 6305
    Rate: 6800
    I added SM Link

    SM for APS-349, 348, 350 power supply Link
  • #9 16611922
    bator90
    Level 11  
    Posts: 89
    Rate: 52
    What about the bm81204. I gave the motherboard to be repaired but still the same
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    #10 16611999
    mirex
    Level 43  
    Posts: 21794
    Help: 1950
    Rate: 1987
    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  
    Posts: 89
    Rate: 52
    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  
    Posts: 21794
    Help: 1950
    Rate: 1987
    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  
    Posts: 89
    Rate: 52
    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.
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