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Need some help with an Insignia LCD

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    #1

    Need some help with an Insignia LCD

    Hi, I was given a broken Insignia ns-l32q-10a, hoping it would be an easy fix.
    The problem is quite erratic, but the main issue it the TV messes up after about 45 minutes to 2 hours. Sometimes it will do one of the following:

    -Power indicator turns off (no led on at all) or red, no sound, but screen is still on playing video, and it won't respond to any button presses.
    -Power indicator turns red, no sound, screen randomly turns on and off with scrambled video, again will not respond to button presses.
    -Power indicator stays blue, but the tv says no signal, and I have to switch the input source back and forth to get it to see the signal again.

    I have thoroughly inspected both the mainboard and the power supply, and there are no caps that look dead visually. I replaced all but one of the caps on the cold side of the power supply, to no avail. (all but one because radioshack(ugh) didn't have the last one.)

    Any idea what could be the issue, and if it is even fixable?
    Thanks

    I can get some pictures if needed.
    Last edited by drummr; 04-22-2013, 01:36 AM.
    Tags: None
    #2
    Re: Need some help with an Insignia LCD

    The caps you buy at radio shack are no good in this application. You need 105C low ESR caps such as the panasonic FC and FM series

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      #3
      Re: Need some help with an Insignia LCD

      I'm starting to wonder if the issue isn't heat related. On a hunch I left the back cover off the tv and set up a fan pointed to blow across the back of the tv and it's been working for about 4 hours without issue. Oddly enough it looks like the cpu on the main board has a heat sink on it, but the chip and heat sink are enclosed in a metal box.

      Last edited by drummr; 04-22-2013, 09:14 AM.

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        #4
        Re: Need some help with an Insignia LCD

        I would get a can of frez and when it goes off spray the chip and see if it comes back up if so i would replace it. If not try spraying other things. To see if it comes back up if so replace that part.

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          #5
          Re: Need some help with an Insignia LCD

          It looks like the heatsink is slipping off the CPU chip, it is on crooked. The thermal interface pad may be not holding the heatsink in place very well.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

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            #6
            Re: Need some help with an Insignia LCD

            The heatsink is actually still firmly attached, just mounted slightly crooked. Though it looks like it is off and resting on the metal cage in the pic. I ended up mounting an 80mm case fan on the back casing right above the heatsink, tapping power off one of the 12vdc lines coming off the power supply. I then used an adjustable voltage regulator set to roughly 8vdc to lower the fan speed to a level where it didn't make any noise.

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              #7
              Re: Need some help with an Insignia LCD

              Nice fix, but if the processor is failing (e.g. solder balls - BGA failure), this is probably not going to last any more than a few months.
              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: Need some help with an Insignia LCD

                Eh, it was almost free (wasted money on non-needed caps), so better than nothing. Plus there's always the good old heatgun reflow .

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