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I have a Sanyo LCD TV that has sound but no picture. Checked power supply and replaced with a new power supply and still has no picture but does have sound . This is for a Model # DP42849 Thank you for any assistance

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  • patmac2 Jan 07, 2011

    good job

  • patmac2 Jan 11, 2011

    Yes Thank You

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Hi,doe sthe screen of your TV lights up?during power on?if not then there might be a problem on the inverter board and the backlight lamp of the monitor .The lamp is a cold cathode bulb it requires a high voltage supply from the inverter board in order to light up.just like any other bulb this lamp has a limited life span more or less 2 years of continues lit.The inverter board is a high voltage board the power input of this board is 24volts DC and the output is 200volts AC.The terminal input of this board or connectors must be check because of high voltage corrosion and loose connections always happen that leads to the mal function of the display or screen failure just like what happen to your TV.
Backlight lamp is installed at the top and bottom of the screen you need to open the back cover of your TV to check up the lamp.(make sure to unplug the TV before proceeding)..check first the test point that I mentioned then post back for your findings then will proceed to further trouble shooting...GOOD LUCK!

Posted on Jan 04, 2011

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Posted on Jan 02, 2017

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Please seek the expertise of an experienced TV repair technician - as they contain potentially lethal voltages that must be properly discharged before work can begin.

Thanks! ! ! !

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