Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
http://electro-medical.blogspot.com/
For some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
Search the site by type in the "brand name" of your device; [Exclude the model number], in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
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Testimonial: "Thank you, very helpful!"
SOURCE: Vizio 42", have picture for about 5 mins then screen goes black.
also check the power cord wire coming from the back of the tv is loose from the tv side or perfect.
SOURCE: Sharp LCD TV, Screen goes black sound stays on
Capacitors on the power pack are going bad they need to be replaced that should fix the problem.
SOURCE: Screen lower half goes black/blank
The lower "Y Buffer" board is defective. Best repaired by a technician, or contact Phillips support for the part if you think you are able to replace a small circuit board on your own.
SOURCE: my sony tv stars blinking 5 times in a row, then
tv has a blanking picture mute circuit. adjust the screen controls which are located behind the speaker grill in front of set. there will be a access panel to unscrew in center and then you will see a black 4 inch square box with 6 physical knobs. 3 control screen the other 3 controls focus for red, green, blue. turn them down and slowly start turning them up. fixed.
Testimonial: "amazing it completely fix the problem, Thank You "
SOURCE: my tv picture and sound turn on and then after a
Hi,
There are two possible causes for this problem, either back light inverter board stop working thus screen goes black as lcd screen needs back light to show its image OR if sound remains while screen goes black then it seems firmware issue.
Let me know is it Insignia NS-LCD42HD tv or any other model?
Do you get sound in tv while no picture?
Does screen show any on-screen display when tv lose picture?
Above info will help me to diagnose problem in tv and to suggest some solution.
Thanks.
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