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I'm not sure what the question is. Do you mean all of your sources are hidden or not visible in the on screen menu? On Samsung TVs, you will only see the inputs that are connected. Confirm all of your sources are properly connected (and powered on) to the TV. If you still cannot see your inputs, you may have a defective main board. I would recommend Tri-State Module if you need a board.
The schematic diagram is going to be very hard to get. We do repairs on this model. What information do you need? The most common problem is the capacitors on the power board. You can find this repair guide at: http://www.ccl-la.com/blog/index.php/repairing-the-samsung-940mw-lcd-tv/ If you need other information then let us know at: [email protected] and we will get glad to assist you in the repair.
if you are talking about vertical section
1 reduce brightness as you will get h/line due to vertical failure.
2 check v/section for loose contact or yoke connection.
3 check supply to vertical section.
4 check associated parts in v.section
5 at last check for vertical ic.
hope this will help.
as per schematic diagram go to
www.serviceinfo.com
good luck
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