Is it my MAIN PCB?

Hey all! I have been getting a lot of questions that end up pointing to the MAIN PCB, so I figured I'd do a post on "what might point to a problem with your MAIN PCB (main board, mother board, etc.).

• Some inputs function perfectly, others do not.
• This means that everything else in your TV is functioning fine. It is receiving proper power from the PSU and it can successfully display a picture and play audio on some of the inputs. The When some inputs are out, while others are still okay, you can assume it is the main board.
• Examples
• My coaxial connection is grainy while everything else works fine.
• There are four HDMI ports and only HDMI 2 will display a picture. HDMI 1, HMDI 3 and HDMI 4 all give me a "no signal" errors.
• The picture isn't quite right
• Sometimes you have a situation in which the picture is the wrong color, skewed, or otherwise "not quite right." All of the settings you change in the menus can't fix it and you are frustrated! That's okay, it might be your main board!
• One thing to mention here is that if you have an LCD TV and there are VERTICAL or HORIZONTAL LINES going through the picture, whether they are thick or thin, you might be looking at a faulty T-CON board or loose LVDS cable (connects the T-CON to the MAIN PCB).
• One last tip! If you are running COMPONENT VIDEO (RGB video and RW audio cables), check to make sure you plugged everything into the correct jack (socket), it's been known to happen. If you switch up the video cables by accident it will definitely result in a very interesting color palette. 
• The audio track is non-existent on all inputs. 
• Wow, what a nice picture! It's absolutely beautiful. Look at that 10000:1 contrast ratio. Oh wait a second, why can't I hear anything! Am I deaf? Is the TV muted? No! What the @#%$! Chill out. Sometimes the cables come loose. Check the connections on the speaker terminals and between the speakers and the main board first, as well as making sure the speakers aren't blown out. You may want to check your connections on the back of the TV as well. A loose cable or one that hasn't been plugged into the correct socket has fooled people more than once. If not, it might be that the main board is faulty and simply cannot process the audio signal.

Anyway, if you think it might be the MAIN PCB giving you trouble, feel free to ask! I'm here to help. Always include the MODEL code with any request to help me best answer your questions!