i have a baird 42" stuck on standby?

It will be a bad connection - if you can take the covers off and gently tap away in selected areas - with the handle of a wooden spoon perhaps -you might be able to narrow down just where the bad connection is.

Without drawings - test equipment and experience fault finding could be a long drawn-out affair. Careful examination of the soldered joints might be useful if you know what to look for.

Use Google
Select Images
Enter Dry Joint

Good luck...
February 2015