Question about Protron PLTV-4250 42 in. LCD Television

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Brightness difficulty The picture in a dark scene is almost black, without any clarity or resolution. This is not a problem with lighter scenes - just those that are, for example, night scenes.

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I had the same problem and so went into the menu and selected brightness and increased the number, and my dark pictures were much better.

Posted on Feb 18, 2009

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Did you try going into the menu and increasing the picture brightness?

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you need to check your picture menu to verify you contrast is at max and brightness level is at approx 55% . if good , call for service and have htem check the setting on the screen controls. sometime they drift with heat, cold and age. when this happens, they usually have to reset the grey scale (black and white content) of the picture. Beyond that could be a defective red crt drive pcb or red crt or small signal panel.

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try to open your tv and you can find the flyback ,in flyback you can see the screen and focus to adjust.use and try to rotate the screen,it control the brightness of your unit

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*The brightness control setting determines how bright your picture will be. *The contrast control sets the gain of the video circuit. This determines the difference between dark and light scenes. Low contrast settings make the picture "hazy". High contrast settings make the picture more distinction between dark and light scenes. *The sharpness control determine the frequency response of the video circiut. High sharpness settings give better resolution but also shows more noise in your picture. Lower sharpness settings smoothe out the picture removing noise but also fine detail. It needs to be set for the best all around picture. *Picture Enhancement is pre-set adjustments which give you different picture qualities. You just select the one you like. Stargazer

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1 Answer

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You are going to need the assistance of a servicer for this problem,I suggest not to use it until it gets repaired ,shop around for an estimate ,tell them what the symptom is they might tell you about how much it might cost,is hard to tell without measuring some voltages.Be safe and call for help.

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1 Answer

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The Picture tubes(not bulbs) do and probably are weak. There replace should only be done by a trained service person. One reason would be the hI Voltage issues related to the crt's, as these tubes store alot of HI voltage even after its unplugged for a while, and another reason would be that these tube can very easy implode then explode and that wouldnt be a pretty sight. Third would be the alighnment involved after all three tubes are replace. There ba cross hatch generator and alot of time involved with the alighnment. Please seek a pro to assit you when your ready to spend at least 900 TO 1000 bucks. Good Luck

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1 Answer

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