Question about Sanyo DS20930 20" TV

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White Line =(

When I turn on the TV I have a small white line across the middle of the screen...After a bit of wait time the picture above it stretches and the line moves to the bottom. After a bit more wait time the white line begins to stretch upward and it takes quite awhile but the picture is fine. This entire process takes close to a hour.

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  • msjj48 Feb 24, 2008

    Thank you for the fast response. I'm a broke college student so I can't afford much. I hope I can find someone around here to repair it and not charge me $50 just to find out what is wrong. Thank you once again. I will post again soon to update =)

  • msjj48 Feb 27, 2008

    Okay...I took my TV to get fixed and the guy told me it would be $300 dollars... I was not happy so I didn't get it fixed. I know I can do this on my own with a diagram. Can someone tell me the materials needed and tell me step by step how to do this? There is no way I'm spending $300 on this TV.

  • msjj48 Feb 27, 2008

    Oh wow! Thank you so much! I'm going home for the weekend and will follow your instructions. I am so happy that you posted that for me! And with PICTURES! *hugs you* YAY

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Hi,

Based on your post, the TV unit is suffering with a Vertical collapse. Further, your description indicates that it could either be a capacitor problem or a cold solder. Though of course there are instances that it could be the vertical IC that may be defective.

This is a relatively easy repair and the part should not be expensive. If the problem is a cold solder, then simply reheating the solder joints with a soldering iron should correct the problem with no parts replacement. Even if you were to do a shotgun approach and simultaneously replace the IC and capacitor, again would not be that expensive.

However, the repairs do require that you be a bit familiar with electronic components and circuitry and the use of a soldering iron (with a desolderer). Should you not be comfortable dgoing this router, perhaps you can seek the assistance of a friend with soldering experience. otherwise, your best bet maybe to seek the services of a qualified professional.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Feb 24, 2008

  • Louie  Role
    Louie Role Feb 24, 2008

    Hi again,

    I understand. If you're a bit adventurous, there is a way to verify if it is a cold solder (and therefore no parts replacement but simply resolder). Give it a not so gentle "tap" at the side when the white line shows up. If it expands (no matter how briefly) then it is a cold solder. Should this be the case, then anybody who owns a soldering iron would know how to use one and can assist you since no parts replacement required.

    Cheers and you be good.

  • Louie  Role
    Louie Role Feb 27, 2008

    300USD for a vertical problem?

    hmm, you can do it yourself as long as you have a soldering iron, a + screwdriver, soldering lead and patience and more patience.

    If and when time permits, open the back of the TV (make sure it is unplug for a long time/overnight to dissipate any charge leftover). You will see a board something like shown below.

    Somewhere in the very center would be an aluminum heatsink. Attached to this would be the vertical IC similar to what is shown below. (In some versions, this IC would be to the far left or right of the board but still midway top to bottom.)

    Underneath the board would be where the pins of the vertical IC would be soldered to the PCB trace. You need to reheat (with a soldering iron) plus a dab of soldering lead. Make sure that the solder joints are shiny, silvery in color as shown below. Check that all other joints within the vertical IC's area are similarly shiny and silvery. Depending on the actual part/IC used, it can be a single row of multiple pins or two (2) rows.

    If the problem persist, locate the capacitor very very near the vertical IC on top. There would be several but only 1 is considerably bigger than the others. Again, sample image below.

    Note the value. This would be something 2200uF/25V (read as 2,200 micro farad by 25 volts). Buy yourself a replacement from any nearby electronic store. Note the location of the + and the - leads. While heating the bottom side, wiggle the old capacitor out. You may need to do the 2 pins one at a time or simultaneously if the pins are close enough. When replacing, make sure the pin holes are not covered with solder lead and pls pay special attention that you get the polarity (+/-) right.

    If again the problem persist, replace the vertical IC. It would look like as shown below.

    If the problem still persist, you would then need a DVM to check for voltages because the next suspect would be the filter capacitor of the low B+ going to the IC.

    You need to post back the part number of the vertical IC something like TA7222 or something.

    Looking forward to your update.

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