In this link you have the service manual, below the image of the manual you see that it puts processing waiting for it to change to get manual and you click on get manual for download. I was checking it and there are the source diagrams
[url=
https://elektrotanya.com/panasonic_th-37pv7f_th-37pv7p_th-37px7b_th-37px7e_th-42pv7f_th-42pv7p_th-42px7b_th-42px7e_chassis_gph10de.pdf] manual [url]
if you need more help, comment