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If this gets the set to power up,I recommend disabling the 27VDC scan derived circuit and use a regulated DC powersupply,preferably one with a current meter,to drive the vertical IC. If drive is weak or missing, determine how startup is implemented as there may be a problem in the startup power supply or deflection IC. You have two problems, a horizontal pincushion problem caused a capacitor or resistor in the horizontal section and a weak old crt,. Replace the convergence IC and check power resistor for leakage, if values are not exact replace them. Now with the help of this simple UC3842 IC Tester, you can test whether the IC is good or bad.