Samsung LN52A630 Startup Problems

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  • neilc6
    Badcaps Legend
    • Nov 2015
    • 1550
    • Canada

    #1

    Samsung LN52A630 Startup Problems

    This TV originally wouldn't startup and the front led would continuously flash. Checked the power supply board BN44-00201A and capacitors had already been replaced but I replaced them again. CM851, CM852 - 1000uF/25V and CM854, CM855 1000uf/16V Still would not start up.

    Found the thread about C102 failures on the main board (BN41-00975C) so removed it and replaced it with an electolytic 47uF and TV started up.

    https://www.badcaps.net/forum/showpo...&postcount=129

    Realized I had installed it backwards (positive end has marking on tantalums) so reversed it. Ran TV for a couple of hours. When I turned the TV off and back on again, got a green screen with vertical lines like the following posts.

    https://www.badcaps.net/forum/showthread.php?t=43532
    https://www.badcaps.net/forum/showthread.php?t=26125

    Ordered 47uF/10V tantalums (part #399-4981-1-ND) from Digikey, replaced both C102 and C131 and still have the same issues. Startup cycles a few times with green screen and finally suceeds after 2-5 attempts.

    Think next step is to replace IC101. Thoughts?
    Attached Files
  • neilc6
    Badcaps Legend
    • Nov 2015
    • 1550
    • Canada

    #2
    Re: Samsung LN52A630 Startup Problems

    This thread here also applies

    https://www.badcaps.net/forum/showthread.php?t=47214

    I am tempted to put the old C102 cap back and add a 100uF in parallel to see what happens.

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