Toshiba 50H72 50" Rear Projection Television "error code ng mean" Questions

...NG QH401 & BLOCK :MAIN SUB (sub is in RED color)...What does this mean? Thanks very much. The error codes only indicate the convergence circuit is not working. In this set it is VERY important to ...

...NG" followed by a number, that means that the is an error. See what you can find out. Hmmmm ... Maybe you guys should read through your manual and you will find that your not supose to see the ...