Try looking in the Avsforum for such. Keep in mind this is an area where a tech would demand a service manual as well as consults with other techs. There are no user serviceable parts inside so no one that doesn't dive in and heed the warnings about lethal voltages or learn more about electronics tend to just be upset and can't be helped.

Some advice I've seen is to replace all the boards if you think the plasma screen is fine. I won't broach the subject of cracks in the plasma screen. Remember I won't talk about that.
Bob