LG Won't turn on 47ld450

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  • tom66
    EVs Rule
    • Apr 2011
    • 32560
    • UK
    #21
    Re: LG Won't turn on 47ld450

    It is a common fault with various sets & it wouldn't at all surprise me...

    Although they are not EEPROMs but flash memory that get corrupted (these words are often used interchangeably but the devices have quite a few differences.)
    Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
    For service manual, schematic, boardview (board view), datasheet, cad - use our search.

      Comment

      • Ice203
        Senior Member
        • May 2015
        • 99
        • Uk
        #22
        Re: LG Won't turn on 47ld450

        Think I might just bin the TV. Don't wanna lose and more money on it.

          Comment

          • tom66
            EVs Rule
            • Apr 2011
            • 32560
            • UK
            #23
            Re: LG Won't turn on 47ld450

            Well, at least sell/give it as faulty making note of your prior diagnosis so someone else can make an attempt.
            Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
            For service manual, schematic, boardview (board view), datasheet, cad - use our search.

              Comment

              • Ice203
                Senior Member
                • May 2015
                • 99
                • Uk
                #24
                Re: LG Won't turn on 47ld450

                I'm still trying to figure out what's wrong with this on. Had 3 main boards and still same problem.
                I've got the power board out and plugged in with the 3.5v jumped to pwr on.
                I then get all correct readings apart from p-dim a-dim and inv on/off. Would this be correct as the mains not plugged in.

                  Comment

                  • ajthatch
                    New Member
                    • Feb 2013
                    • 3
                    • USA
                    #25
                    Re: LG Won't turn on 47ld450

                    I have the same model with exactly the same issue - did you ever track down the problem? I'm thinking it could be the power supply even though the caps look good.

                      Comment

                      • Louis82
                        Badcaps Veteran
                        • Feb 2012
                        • 240
                        • USA
                        #26
                        Re: LG Won't turn on 47ld450

                        Hi.

                        I have this tv that turns on and show picture for a few seconds. Power board makes a loud humming noise.
                        Forced power board to turn on using resistors on PS-ON and BL-ON and I get the same thing, screen turns on for a few seconds and goes off. In those few seconds I notice shadows, like if some lamps are not turning on.

                        Disconnecting screen from power board, the power board still makes a loud humming noise. My believe is a defective power board. I couldn't find any over heated component or loose connection.

                        Does anybody have any suggestion on what to try before I order a new power board?

                        Thank you

                          Comment

                          • wreksta
                            Badcaps Veteran
                            • Aug 2013
                            • 508
                            • england
                            #27
                            Re: LG Won't turn on 47ld450

                            yes those inverter transformers are suspect test each one see if you get same result from each one
                            had this fault and thats was the culprit

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