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Samsung LN40B550 stays on 2 mins then shuts off

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    #1

    Samsung LN40B550 stays on 2 mins then shuts off

    I have a Samsung 40 inch that was possibly struck by lightning. if its unplugged for 30 mins or so and you plug it in tv automatically comes on with out turning it on and it will play perfectly for about 2 mins then shut off. then the red Led LIGHT WILL BLINK but with out a common pattern. the tv will not turn back on until tv is unplugged for a period of time. Any suggestions on what may be the issue as in the power board or mother board. Thank you in advance.
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    #2
    Re: Samsung LN40B550 stays on 2 mins then shuts off

    First do a couple of simple checks.
    Enter the service menu and see if they're are option called

    'Ready'

    Or

    'Watchdog'

    If either of these are ON turn them OFF.

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      #3
      Re: Samsung LN40B550 stays on 2 mins then shuts off

      On the power supply there is a ribbon cable that goes to the main board. Measure all the pins and post them here with their corresponding pin out, with the TV on and then again when the TV acts up.

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        #4
        Re: Samsung LN40B550 stays on 2 mins then shuts off

        Thank you all . It was the main board . A cpu i guess was getting over 140 degrees and it would shut off. I used a laser temp gauge and a blow dryer on cool air and as long as I kept the cpu around 128 degree the tv played properly but when I removed cool air it would heat up and shut off.

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          #5
          Re: Samsung LN40B550 stays on 2 mins then shuts off

          Originally posted by bluedawg View Post
          I used a laser temp gauge and a blow dryer on cool air and as long as I kept the cpu around 128 degree the tv played properly but when I removed cool air it would heat up and shut off.
          So did you hack in a cooling fan over top the CPU or did you put some thermal pad on top of the CPU and attach it to the chassis/shield?
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