SH-BOOM oh life could be a dream.......
When I trained a new tech they they first needed simple theory.
Next know the block diagram. Last a good memory.
Then BEFORE the analyst & scope came out use your senses.
Listen, look, feel, hear. smell etc. Use quick & simple techniques.
In the tube days 95% of sets were fixed with a Simpsom 260 or
RCA Volt - Ohmist. Once in a while the ringer came out to check
a FBT or yoke. There are even cheats for that.
Glad I could help & WD by you.
73 Zeno
LFOD