Question about RCA L37WD12 37 in. LCD HDTV
Sounds like your Backlight Inverter Board is going out, saw one on ebay for about $55 : ) have to get the one for your model tho...
Posted on Aug 21, 2009
Easiest way to identify the problem is to try and use a different TV set with the converter box. If you still have a brightness issue, it is the cable box that is causing problem. Call Comcast.
Otherwise, the tv itself is having issues maintaining a steady brightness, likely due to the auto-brightness control. You didn't mention which tv that you had, but there will be a sensor somewhere on the front of it that detects ambient light intensity. Try blocking this sensor with a piece of opaque tape (like electrical tape) and see if problem disappears. If it does, think outside the box for the root cause.
Were the fluorescent lamps in the room just replaced? Was a fluorescent lamp just added (does it make a difference if all the lights are turned off)?
If it doesn't make a difference, then the inverter for the backlight, or the backlight lamp itself, is near end of life, and needs to be serviced, in the case of a flat panel TV. On a regular tv that has a picture tube, the brightness gain is unstable, and likely requires a service shop.
Posted on Sep 22, 2010
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