You would need the service manual, the usual shop tools like Volt Meter, Oscope and background in TV repair. The manual is over at www.shopjimmy.com and about 12 dollars. I find most folk won't buy the manual and when I work on a set, if they don't buy this, I turn the job down. (corrected typo here.)
More ideas at https://www.shopjimmy.com/tv-repair-tips


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