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Insignia 42" won't turn on - gray screen

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    #1

    Insignia 42" won't turn on - gray screen

    Hello all, I have an Insignia 42" TV (model NS-42P650A11). After a recent lightning strike, I was not able to turn on my TV. When I plugged it in, it would just click about 5 times and then shutoff. It never really turned on at all. Also, I was not able to use the remote or the touch buttons on the side of the TV to get it to do anything.

    After inspecting the power supply board, I didn't find any bulging, cracked, or leaking capacitors. I measured the voltages going to the X-main, Y-main, and logic board, and they appear to match what is printed on the circuit board. So, I think my power supply board is fine. I did find a shorted transistor on my Y-main, but rather than replacing that transistor, I just decided to buy a new Y-main board. While i was at it, I replaced the X-main, logic board, and Y-buffer board. The only boards i did not replace were the power board and main board (with all the video inputs).

    So, after replacing all the boards, i plugged in the TV. It clicked once like it was turning on, and prior to pushing any power buttons, the TV powered up with a gray screen for maybe 5 seconds, then turned completely to a black screen. The TV still does not respond to the remote control (which i know is working), or to the buttons on the side of the TV. Honestly, it's hard to tell if the TV is even powered on. I assume it is since the green LED on the logic board is on.

    So, to my questions. Is this normal behavior for just plugging in the TV and not pushing any power buttons? Is it possible that the IR board on the TV is bad, so the TV won't really turn on or respond to remote or buttons? What are symptoms of a bad display panel? Could this be my problem?

    Are there any other tests i could run to narrow it down? Any help would be greatly appreciated. Thank you!
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    #2
    Re: Insignia 42" won't turn on - gray screen

    Try this test:
    https://www.badcaps.net/forum/showpo...61&postcount=2

    After doing this, a sequence of test patterns should appear.

    Power surges can often damage multiple components and the main board is often one of these. It is rare (though I suppose not entirely impossible) for the X- and Y-main to be damaged; power boards and main boards suffer the most, due to their externally exposed inputs (AC power, HDMI, cable/antenna TV, component...)
    Last edited by tom66; 10-12-2013, 05:19 PM.
    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.

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      #3
      Re: Insignia 42" won't turn on - gray screen

      Thanks for the reply! I've attached a picture of my logic board below. I want to make sure i get it right, which cable is the LVDS cable? Is it the flat cable that goes to the main board (coming out the top in my picture)? Or the cable on the left that goes to the y-main board, or the cable on the right that goes to the x-main board? Or the one that goes to the power supply board? Appreciate the help!
      Attached Files

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        #4
        Re: Insignia 42" won't turn on - gray screen

        Tom, I ran the test you suggested. I get a white screen, then red, then green, then blue. Then it goes thru a series of scrolling colors. And then it repeats...

        I'm assuming that's a successful test? Where do we go from here? Does that suggest a bad main (A/V) board?

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          #5
          Re: Insignia 42" won't turn on - gray screen

          Lightning strikes typically take out main boards and power supplies. Since your control board test checks out, and you're having issues with the remote and the TV's buttons, your main board is likely damaged.
          LG Plasma Mal-Discharge Correction Service

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            #6
            Re: Insignia 42" won't turn on - gray screen

            Ok, main board then. What are the chances the IR board is bad also? I'm wondering if I should maybe replace that also. Or is there any way to test it?

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              #7
              Re: Insignia 42" won't turn on - gray screen

              Does that also have the manual power on/off button on it? If so, just disconnect it for now. Test it later when you can power on the TV by on/off button and then check if you can power it on/off by remote too. If so it's OK.
              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

                #8
                Re: Insignia 42" won't turn on - gray screen

                There are "manual" buttons but they are part of the IR board also. The power "buttons" on the side of the tv aren't really true buttons (I mean they don't click or move when pressed). I think they are some sort of "touch" buttons. But again they are all part of the same IR board.

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