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SCREEN STARTED DIFF COLORS, RASTER DARKENED, SCREEN SHRUNK, BUT AUDIO OK , THEN EVERYTHING QUIT . HAPPENED OVER A 2 WK PERIOD TOOK TO A SHOP , THEY SAID T-CON BOARD BAD , WANTED 400 TO FIX , UNIT ONLY COST 500. 2 YRS OLD , GOT UNIT BACK

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  • joebriggs May 19, 2011

    THE MODEL IS A 32" SAMSUNG LED LNS3241DX/XAA



    I AM THINKING MORE ITS THE POWER SUPPLY BN96-03057A



    BECAUSE OF THE SHRINKING SCREEN THEN NOTHING ?



    THANKS ,JOE

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Hi.

LCD TVs do not have convergence circuit. If display shrunk then it is likely the T-Con board. The other option is a defective PSU that caused the whole TV to malfunction and shut down.

Note: If the technician has opened and tested the TV, and he found the T-con board is faulty, then the TV is not worth repairing. The below is in case the technician did not test the TV.

When you go to a repairer they always give you a quote on the most expensive fault. The only other option to get a quote is having TV tested. If it is PSU, then repair will be below $200 (DIY below $100 if you know how to test).

The problem with the T-Con board is that with most TV models the T-Con board is not sold as separate part, but as one single part integrated with the display panel. Because of this reason when problem is T-con board, the TV is not worth repairing.

About the PSU, the LCD power board is quite difficult to test for a person without technical training. Sometimes it is however possible to spot bulged or melting capacitors or burnt areas.
A PSU for an LCD TV is usually below $100. The part must be tested before replacement.
If TV has already been tested and the tech found a defective T-Con, then replacing the PSU will unlikely help (PSU is the first part we test).

I can be more specific on parts' price if you give me the TV make and model number.

Regards.

Ginko

Posted on May 18, 2011

  • Ginko
    Ginko May 19, 2011

    Hi.

    As far as I know the SAMSUNG LNS3241DX/XAA is not a LED model, but an LCD model using back-light system.

    Sometimes it is possible to see that the PSU is damaged at a glance. More commonly the PSU must be tested.
    Proper testing consists in checking the power cord and its soldering joints to PSU in main power connector ; testing the Zener near the AC connection; testing components in AC section of PSU. Testing components and tracking voltage in the DC-DC section of PSU; replacing defective components; testing voltages out.

    In their service documentation Samsung suggests to replace PSU straight away without testing. This was because the simple PSU used in this model was relatively cheap (less than $50)

    PSU part number is BN96-03057A.

    Unfortunately the PSU is out of stock almost everywhere.

    The cheap options are all sold out :


    BN96-03057A BN96-03775A PSLF201501B Samsung Power Supply

    $39.99 - RetechTV.com

    BN96-03057A POWER SUPPLY PSLF201501B

    $38.00 - DiscountTVParts.com
    Samsung BN96-03057A Power Supply
    $49.00 Shopjimmy

    The following merchant has the part in stock, but it is more expensive:
    Samsung BN96-03057A Power Supply

    If that is not available use the substitute part: BN96-03775A. According to Encompass (one of the bigger sellers), part is compatible. Part is also out of stock almost everywhere. Here last one in stock from one seller.

    Use parts numbers in Google to explore more options. The PSU for this models are all gone. That means that they fail quite often.

    Regards.

    Ginko


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