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Not sure if you are aware of this, but the whole chassis/crt bezel assembly comes out through the front of the cabinet. There will be some screws behind the safety glass nameplate, behind the large knobs and some at the rear top and bottom. My set is the slightly newer 17Z22Q chassis with the space command remote. My main power supply cap on was blistering/leaking. Minus the safety glass and knobs with the screws removed, lay the set on it's face and lift off the cabinet. Don't forget those speaker wires!
Howard Sams covers the 17Y20 chassis in Photofact 335-19.
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