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Samsung S24B300EL Garbled Screen

Discussion in 'Troubleshooting and Repair' started by leggot, Nov 10, 2014.

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  1. leggot

    leggot

    30
    0
    Mar 28, 2012
    I have a Samsung S24B300 that has an issue in which the screen is garbled when first turned on. After times varying from 5-20 seconds the screen resolves itself.

    The main circuit board is labeled sa350 and is the version with VGA and HDMI connectors. Anytime the screen is garbled, there is a high pitched noise coming from a cluster of components but when the issue resolves itself, the noise disappears.

    I tested the powersupply, it is rated for 14v and it varies from 15 - 14v depending on the board and it also has a center pain making it non standard. However, the powersupply was swapped, and it didn't change anything.

    I have powered the unit up with the tcon board unplugged and it, waited 5 minutes and then plugged it in and the issue was resolved, so I think it is isolated to the main board, but I am not 100% sure.

    I have tested the main board voltages and they seem fine when the display is garbled, so I don't think that is the issue.

    Please let me know if you have any ideas.
    [​IMG]
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    And the service manual: http://www.go-gddq.com/upload/2011-12/11122610175323.pdf
     
  2. davenn

    davenn Moderator

    13,561
    1,856
    Sep 5, 2009
    from what appears to possibly be a temperature related issue with a component
    you mite find a can of freezer spray very handy to cool areas off to see if you can make the fault return
    once you have narrowed it to an area of components, you can refine your spray efforts more accurately to
    individual components in that area and see what you discover :)

    cheers
    Dave
     
  3. jademayer208

    jademayer208

    2
    0
    Nov 10, 2014
    I think you should do same as Davenn said,I agree
     
  4. leggot

    leggot

    30
    0
    Mar 28, 2012
    So I heated the board up and it seemed to temporarily fix the problem. I am unable to isolate a specific area that seems to be more responsive to heat, but Im pretty sure that this is a heat related issue.
     
  5. davenn

    davenn Moderator

    13,561
    1,856
    Sep 5, 2009
    so get yourself a can of freezer spray and once the unit is warmed up and working correctly
    use the spray in one little burst at a time around the board and wait for it to fail
    DONT spray liberally as you will then still have to do finer spraying to narrow the faulty component

    EVERY service guy or budding service guy should have freezer spray in his toolkit ;)

    Dave
     
  6. leggot

    leggot

    30
    0
    Mar 28, 2012
    It appears as if the main chip is causing the issue. When it is sprayed and then turned on it causes a prolonged time that the garbled screen is shown. It occurs to me that before replacing the chip, it may be beneficial to reflow the board. Is this the right approach or are there other ideas?

    [​IMG]
     
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