Question about Sanyo DP42849 42 in. HDTV

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I have a 1 year old sanyo 42" lcd tv, model DP42849, The tv was running perfect till one day watching a movie, the screen went black and audio went all strange, i shut it off and on, and nothing, the power still stays on but no video. Using a LED flashlight shining through the plastic vents on the back in the dark it shows up the "video 2" box in the corner, so i know that still works just no back light on the tv now. What part is gone or maybe a fuse?

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You need to find out if the power supply is putting out 24vdc for the backlight inverter board, it can be that the inverter board has short circuits which will cause the 24vdc to go into shutdown to protect itself, you can disconnect the power cables to the inverter board to see if you will get the 24vdc back.

Posted on Aug 17, 2010

  • geraldmuise0 Sep 30, 2010

    I completely took apart the tv to look for Bad caps but noting that i can see, how would i test to see if it is pushing out 24vdc? and yeah it has been unpluged from wall for over a month now and still same thing, turns it on, HDMI title comes on top right corner then goes off. Im so lost and dont wanna order parts if i dont know what he could be, and no tv repair shop here wont fix it because we live in canada and this tv is made in United states so they have no repair manuals ughh please help me

  • Bud Martin
    Bud Martin Sep 30, 2010

    You will have to look at the power supply module to see if it has any printing on the board that shows the voltage output labelling.

    See:



    Please see my basic troubleshooting guide here:

    http://www.fixya.com/support/r5093881-lc...



    Failed TV and Monitors: http://s807.photobucket.com/home/budm/al...



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



    You may have to disconnect the power connector that supply the power to the inverter board to see if the 24vdc will come back on, the short can be in the inverter board itself. Pictures of the boards will help since service manual is hard to come by.

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