I have checked the back lights they are all lit but the pic is on just visible with the brightness etc all turned up full does anyone have any idea what could be causing this problem i am having trouble getting a service manual for this set
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Please try reducing the contrast a little and increasing the brightness till the dark shots are clear. Please also check the back light setting. It should not be too low.This should make all the dark scenes clearly visible if it only a setting problem. In case the overall brightness has reduced, please consult a local TV Tech.
Have you checked all the back lights. If not check it. Replace the faulty ones. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
The best picture settings depend on several factors, including personal preference and lighting conditions. Are you watching in a brightly lit room or in the dark? If there is light, is it coming from behind you or from one side? Or from above?
check the heater voltage (H) of Flyback to display tube (CRT) is available, or check the parts 'resistors' = (0.5 to 1 Ohm), through which the voltage. confirm whether burned or not connected. or the easiest is to see the back end of the CRT tube, whether such bright lights? when lit it indicates there is voltage to the heater.
When lit, you try to turn and raise the "Screen Adjustment" on the Flyback Transformer (FBT) near/under " FOCUS Adjustment ". your TV screen light will grow brighter as rotated to the right / upgraded. image will appear visible on the screen, but not too bright.
Lcd tv sets are lit by small glass florescent tubes called cold cathodes and, are powered by: ballasts called inverters... these go out just like your office florescent lighting the parts can be purchased online from electronic parts houses and, are easily replaced
if the picture is REALLY dark, like you can just barely see it in a lit room, then the backlight might not be lit. LCD TVshave backlight that shines through the LCD screen which allows you to see the picture.
If it's not the backlight then it would be the brightness/contrast settings that need to be adjusted. If the picture used to be normal and all of a sudden went dark, verify the backlight. Normally you can look through the slots on the top of the set and determine if the backlight is on. If you can see a bright light through any of the slots, the backlight is probably OK... go after the brightness/contrast settings.