Question about Sharp LC26SB24U 26 in. LCD TV/DVD Combo

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I've only had my LCD TV for 16 months and of course now that the 1 year warranty isn't in effect the darn TV decides to break down. The TV screen is bright white with sound. What is wrong with it? :(

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  • Sharp Master
  • 8,457 Answers

This problems i fix it before,it the Tuner board the main board that take the coalax signal in to get the broscast programs it dead.Tries websites like Shojimmy.com,Ebay.com to buy a refurbish Tuner board for the replacement.Will solved this problems,i experience before.

Posted on Jul 14, 2010

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  • Master
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This is very common problem with this model, failed transistor for switched 12vdc (located on the POWER SUPPLY board) for the T-CON board, you can easily check it out without spending big money for new board. Please verify that before buying the main board.
http://s807.photobucket.com/albums/yy352/budm/Sharp%20LC-26SB24U/

Here is the service manual for in depth troubleshooting.
http://elektrotanya.com/?q=showresult&megnev=sharp&megnev2=lc-26sb24u&kategoria=tv&kat2=all

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Posted on Jul 15, 2010

  • 2 more comments 
  • hitide99 Sep 22, 2010

    As suggested, I replaced the failed transistor (Q413) with NTE153 and that did fix it ....for a few days, then it broke again...same problem. So I replaced the transistor again and sure enough...that fixed it. Then sure enough, it broke again.

    Oddly, I replacd the tarnsistor again, but this time with the original KTA1281 and that does not fix it. It only will work with the NTE153, but breaks afrter a few days.

    Weird problem.

  • Bud Martin
    Bud Martin Sep 22, 2010

    Did you put in with the correct pin out when you use the NTE153?
    This is the spec sheet for the KTA1281: http://www.datasheetcatalog.org/datashee... KTA1281.pdf
    Please note the E, C, and B of the KTA1281 compare to the ECG153.
    If you look at my pictures of the transistor mounting, it should be as shown in my pictures. http://s807.photobucket.com/albums/yy352... LC-26SB24U/

  • hitide99 Sep 23, 2010

    Yes, I did mount the NTE153 exactly as shown in your photo. This did fix it and it worked fine for about 5 days, then it failed with the same problem. I replaced it again with the exact fix/failure results.

    The third time, I used the KTA1281 and did consult the datasheet for proper placement, noting E,B,C, but that did not fix it at all...just a white dcreen. Then, I was wondering if I had inserted it wrong, so I put it in the other way and of course it did not work and I had a black screen.

    I don't know what is going on here. I bought my parts brand new from MCM. Thanks!

  • Bud Martin
    Bud Martin Sep 23, 2010

    You need to test the KTA1281 with the DMM to see if all the junctions are still good, also check the failed NTE153 to see which junction has gone bad. The original KT1281 in my set had Emitter to Base shorted out so it never turns on. The 12 v out put is at the Collector of the transistor, the input voltage from the power supply is fed into the Emitter of the transistor. My is still working.

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