Hmm....
'Sams' is a series of manuals devoted to the TV servicing industry They contain service info and schematic diagrams of most/all North American model TV sets.--Even I know that, and Ive never seen one--living in the UK, we have the 'Newns' manuals and 'Trader' sheets which are a loose equivalent.
Here you go, Look up your set--
https://www.samswebsite.com/en/photofact/search/types
You'll need to find the schematic of Your Actual set in this series of manuals or from its makers/other sources, and copy the chroma/sound/IF stages, parts of it here so a diagnosis can be made. You'll need to include as much info as you can,--things you've done, voltages checked, parts changed etc.....
Otherwise its like saying--My car wont go. --Why?--Not trying to be clever, but fault-finding is a detailed process, needing as much info as possible....