Hisense LTDN50K220WSEU stuck in standby

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  • toty79
    Member
    • Mar 2019
    • 42
    • Italia
    #1

    Hisense LTDN50K220WSEU stuck in standby

    Hello to all friends of the forum and well found, here I am asking for your help and sorry for my translated English.



    As per Hisense tv title LTDN50K220WSEU stuck in standby
    PSU rsag.820.5687 HLL 4855WF
    Main rsag 7.820.5842
    I enclose the psu diagram, after the first routine checks I find myself with a regular standby voltage of 3.3v blue light on steady when the power button is pressed nothing happens, psu disassembled and bench checked ... forced ignition by sending a signal 3 , 3v on the SW and PWM2 pins the psu turns on and delivers all the voltages also the backlight turns on (190Volt) so I think the psu is ok even if I find the 16v voltage a bit high (23v) when empty .. my search moves to the main of which unfortunately I do not have the diagram ... first checking all the regulators I find a position regulator N36 regulator SE8117TA suspect
    Pin 1 = 0.48mv
    Pin 2 = 0.66mv
    Pin 3 = 5v
    replaced with BM1117 adj now I have voltage at pin 2
    BM1117 replaced with tensions
    Pin 1 = 0.25v
    Pin 2 = 1.5v
    Pin 3 = 5v
    still blue led steady and tv stuck in standby,no return voltage from mainboard all the other controllers are normal, any advice is well accepted thanks to all
    Attached Files
    Last edited by toty79; 05-01-2022, 04:42 PM.
    Tags: None
    • dskall
      Badcaps Legend
      • Oct 2016
      • 2905
      • usa
      #2
      Re: Hisense LTDN50K220WSEU stuck in standby

      Try heating up processor with heatsink removed and try turning tv on.
      I assume no responsibility for any stupid suggestions I might post.

        Comment

        • toty79
          Member
          • Mar 2019
          • 42
          • Italia
          #3
          Re: Hisense LTDN50K220WSEU stuck in standby

          Thanks dskall ... trying to heat up the cpu, the TV started up after a while about 10 minutes and returned to standby and did not start anymore ... trying to heat part again but after a while the defect returns ... I have no equipment for reballing then I opt for a used mainboard ... thanks to all

            Comment

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