Question about Sony PFM-42B1 42 in. HD-Ready Plasma Television

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Just check - easiest with another tv if you have one that the signal source you are using is not the cause of the dimming. Also check that the voltage supply to the set is at the correct level - unlikely but a slightly lower voltage on the power circuit could dim your picture. The phosphor in a plasmascreen is generally a thin coating inside each of the tiny glass pockets which contain the plasma gas mixture (each of which becomes a pixel when activated). Unless you could open up each one of the pixel pockets and recoat the inside (not recommended) the answer to your question is no. Since the picture is made with phosphor, engineers can accurately predict the geometric decline of the phosphor?s potential brightness. Note that while the brightness declines slowly, the phosphors never actually burn out. Also, note how the rate slows over time. The rate of decline points to a specification called ?Life to Half Brightness? or LTHB. The half life ranges from about 10,000 to 60,000 hours, depending on model, it is about the same as you?d expect in a high-quality, properly calibrated TV or studio monitor.(see attached graph). Here is the link to the user manual for your set if you need it; Check page 97 of the pdf (page 45(GB) of the manual) - it explains the self diagnosis feature. Sorry I couldn't find the details of the resulting flashing light's meaning online - you need to contact sony with the results to find out for sure if your screen is the problem. Hope this helps - sorry if bad news :)

Posted on Aug 05, 2007

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