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LCD TV picture going dim? Can it be fixed?
My 32" Westinghouse LCD TV has a picture that grows dim after being on about 15 minutes. The TV is only about 3 years old. It is not a projection style LCD TV. I was told the Inverter board was the problem so I replaced it, but the TV still goes dim after a few minutes. Is there anything else that can cause the lights in an LCD TV to go dim? Any help is appreciated.
2 Answers
- PoohBearPenguinLv 71 decade agoFavorite Answer
Many LCD TVs use a light bulb to provide the light for the screen. Like any other light bulb, eventually this one will start to burn out and will need to be replaced.
Information about this will be in your user manual, as well as how to order the light.
Be aware that the bulb can be rather expensive. It might be cheaper to just buy a new TV.
The new LED (not LCD) sets use LED lights instead of a normal light bulb. LED lights don't burn out, so these sets don't have this problem.
- Anonymous8 years ago
From what you have described, you have an LCD television that is backlit by a high-voltage florescent tube. In the earlier flatscreen TVs, except for plasma, all were backlit with florescent tubes. More often than not it is the high-voltage circuit that drives it that develops issues with inexpensive models of televisions. Usually when a problem develops like this is best to do is to just replace the TV.
Today, LED backlit sets have pretty much replaced the older florescent illuminated models. So if a model says "LED television" versus the box saying "LCD television", the first one is backlit by LEDs the second one is backlit by a florescent tube while both are still an LCD display or liquid crystal display. LED backlit sets do dim with age especially if A) the manufacturer choses cheap quality LEDs (dims in a pronounced short period of time) or B) with high quality white LEDs, will dim much slower. In both cases the way to slow the dimming process is to turn the set off when not in use and lower the backlight level to a minimal level needed to see the picture with decency.
In general LEDs do not just up and burn out. They almost always dim over time. Once their luminosity output reaches 50% of original then that point is considered a failure point. This can be determined with an instrument designed for measuring screen brightness versus manufacturer specifications. So if the set is performing at 50% output or less and the set is still under warranty, the manufacturer then becomes responsible for replacing it.
