My tv pictures are really really dark on most tv shows but the commercials seem to be fine - we have tried using the menu to brighten the picture but nothing seem to work - this tv is less than 2 years old - any suggestions?
You didn't say if you are receiving an off air picture or cable or satellite. The reason the commercials look good is because the local station (or source) transmits them "in the clear", that is, without any enhancements to the video signal. Network programing or local newscasts are sent through a device which inserts a reference signal in what's called the "vertical interval". You may have seen this as a series of flashing dots or pulses at the very top of the picture. There's a lot of information packed into the VITS (Vertcal Interval Test Signal). One of the lines contains a reference pulse for video which is set at a certain level. Your TV sees that level and automatically adjusts its circuitry accordingly. What I suspect is that your set is out of calibration and is pushing down the video signal because it is not "seeing" the level properly. A video alignment should correct this and can be done by a good repair facility. Hope this helps.
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Check the bulb and ballast board. Contact any service technician.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
how about in the menu button you can not get an adjustment in brightness control. if the display in the screen is too dark either in any channel or even watching a movie from an input source like dvd player, then i may say that the picture tube need now replacement.
In many many cases this is an indication of a failing picture tube. The gun assembly in the neck of the picture tube is shorting. There is a fix, but this is surely last resort and the final cure may not provide a fix. Picture tube rejuvenation is not always successful. I would certainly opt for a new TV. Thanks for asking, and show a few hands of support!
sitnlisten - yes it does appear your pix tube is getting weak,but we may be able to turn up the flyback alittle to brighten up the picture.If you take the back off you will see the flyback-large black unit with a wire going to the round rubber cap on the back of the pix tube.Look at the flyback there are usually 2 adjusters one marked focus the other screen,just turn up the screen a little bit at a time.If you turn this up too much you will wind up with retrace lines on the screen.You may also want to check the pcboard ass'y for a sub bright adjust,and same thing small adjustments.If this don't help your pix tube may be too far gone.I hope this helps. cooltek Feb.1/08
Your set may need to have a screen control adjustment.
This adjustment is on the high voltage transformer and the back cover will have to be removed a access it. I'm assuming that your set has a picture tube in it- not a plasma or LCD display.
If this is the case you can remove the back cover and adjust this control while observing the picture being shown. If you adjust it too high you'll get retrace lines (fine lines going accross the screen). If you're not comfortable doing this or inexperienced, you might want to get a technician to adjust it for you. There are dangerous voltages inside!
This could be one of three possibilities, one the High Voltage Screen Adjustment is off, Two the Picture Tube is Weak, or Three there is a problem with the Video Drive Amp/Amps, these are things that should be checked or adjusted by a qualified technician, especially the High Voltage Screen Adjustment, hope this helps.
I thught I answered this one but if you disconnet the sensor it should brighten up the picture If it dosent then its part of the brightness curcuit and must be replace. As I remeber thewre are severall models that you could simply disconnect. Or there should be an auto brightness feature in the main menu picture ajustment to simply disable or shut it off. Good luck