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WH ld4655vx no power issues?

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    #1

    WH ld4655vx no power issues?

    Hello all, I am new to the forum and have a general knowledge of electronics. I have recapped several computer monitors and tinkered with a few tvs. I have a westinghouse ld4655vx that is getting no power. I have no lights when plugged in, which I am told will have a amber logo light when plugged in, that switches to blue when powered on.. I opened it up and was hoping to see some obv bad capacitors, however, I didnt. I am suspecting the main board is bad,I found one for $110, and got the tv free..but..If I could fix the board myself , I would be happier. I just dont know where the fuses are and the voltages that they should be reading..Any help would be greatly appreciated...I will post pics of the board in a few...
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    #2
    Re: WH ld4655vx no power issues?

    Hi and welcome to the forum. I would be looking at the PSU first. The fact that you don't have an indicator light tells me that the PSU is malfunctioning. Remember, caps don't HAVE to be bloated to be bad.

    Start by checking all the pins on the PSU and see if you are getting any voltages there. If not, then you most likely have some bad caps or other components.

    Also, it's going to be best if you can post good clear photos of the back of the whole chassis and at least the PSU for starters.

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      #3
      Re: WH ld4655vx no power issues?

      Here are some pictures!
      Attached Files

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        #4
        Re: WH ld4655vx no power issues?

        This tv only has one board,, it uses a ac/dc ext power supply.. I have tested the power supply and it works..Just wondering where to go from there , which pins to check and I cant really tell if there are fuses on this board...Or none I am familiar with
        Attached Files
        Last edited by thesupa; 02-26-2013, 03:38 PM.

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          #5
          Re: WH ld4655vx no power issues?

          Hey thesupa, I have no experience with this style TV but from inspecting the main board, it "looks" as if there was a component that may have heated up and fell off the board.

          Have a look at the image attached and then inspect the board closely where you see my red mark.

          Also, take you meter and test all the pins on the connector second from the right. The one that has 10 colored wires. Try testing some points where the DC adapter plugs into the board as well. I have to imagine that the DC adapter still has some sort of shutdown mode. Just make sure that power IS coming into the board.
          Attached Files

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            #6
            Re: WH ld4655vx no power issues?

            Well, I went to plug in the board, so i could take some readings. I got smoke as soon as i plugged it in...The left side ribbon cable was melting . So figuring that had a short in it, and after reading another post about this,,I unplugged that ribbon cable and plugged it back in, and it is working ,,it is alittle dim on that side.. That cable is ran through the tv chasis then comes out in the front bottom left corner..It has never been dropped , so i am curious as to why that wire ended up shorting...Now i just need to find a cable...12pin flat pressed ribbon cable.

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              #7
              Re: WH ld4655vx no power issues?

              Or do you think the board caused the wire to short, I could test this by plugging the right side ribbon into the left side output on the board,but am afraid I am going to screw that ribbon up too!!!Any thoughts?

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                #8
                Re: WH ld4655vx no power issues?

                Nevermind,,,I killed it,,tried to get to fancy..Thanks for your help though,,good thing it was free...

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