LG 50PK350 Stuck in Standby not clicking

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  • satinser
    Badcaps Veteran
    • Oct 2012
    • 214
    • uk
    #1

    LG 50PK350 Stuck in Standby not clicking

    Unusual because whilst it is stuck in standby not the usual clicking you normally have with this model. Red standby illumination with no response from remote or manual controls. if power turned off after around 7 seconds 1 single relay click. Power board is EAY60968801 which I believe is almost identical to the PSU used in LG 50PJ350 ( EAY60968701). The only difference is the EAY60968801 has the extra connector for the Xsus board whereas EAY60968701 hasnt because powered from Ysus in 50PJ350.
    With the 50PJ350 testing power supply is relatively easy because SMPS turns on automatically when main board disconnected.
    Can anybody confirm that this is also the case with the 50PK350?
    Have tested all components which are known to fail with this power supply ( EAY60968801) and no problems found. Any advise appreciated
    Tags: None
    • Wilderone
      Senior Member
      • May 2018
      • 76
      • Australia
      #2
      Re: LG 50PK350 Stuck in Standby not clicking

      Check the back of the power supply for cold solder, quite common on this one.

        Comment

        • satinser
          Badcaps Veteran
          • Oct 2012
          • 214
          • uk
          #3
          Re: LG 50PK350 Stuck in Standby not clicking

          Appreciate your reply but done that and none found

            Comment

            • R_J
              Badcaps Legend
              • Jun 2012
              • 9535
              • Canada
              #4
              Re: LG 50PK350 Stuck in Standby not clicking

              If you have stby voltage going to the main board, you should see the RL_ON pin change when you press the power button, I don't believe this power supply has pullup resistors for the RL_ON so you would need to use 1k from stby to rl_on to turn it on. It may also require a 1k from stby to M_ON, You may also need a wire between ground and AUTO_GND
              Last edited by R_J; 06-16-2019, 06:04 PM.

                Comment

                • satinser
                  Badcaps Veteran
                  • Oct 2012
                  • 214
                  • uk
                  #5
                  Re: LG 50PK350 Stuck in Standby not clicking

                  Managed to repair it. It was a faulty Controller chip IC701. Desoldered chip from a scrap board to replace chip. When tested worked straight away.
                  I can confirm that with mainboard connector disconnected from PSU (EAY60968801) all voltages present.
                  Worth noting for the future if ever a stuck in standby situation with this model and no clicking and with main board disconnected only 5volt active from psu.
                  Controller chip IC 701 should be suspected.

                    Comment

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