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Model CF1926A TV with insufficient vertical height. I replaced c308, c305, c301, c315. voltage was missing from ic501, pin 29; restored with replacement of c301. no help to vertical. voltage was missing from ic501, pin 37. replaced c315, still no voltage pin 37. 9 volt supply is present. ic301: all voltages present & correct, except pin 6, which jumps up when meter lead touches leg, then fades to 1/4 volt. replacing c308, d301, no effect. vertical is 6 inches top & bot short of full screen. Height control works properly. no resistors found bad. 26 volt line good, 9 volt line good. Is ic301 bad? output voltage is 1 volt high at pin 2. Pins 7 and 3 have same voltage, as though d301 might be bad, but replacing it resulted in no change.

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I think you missed one cap. Look for another 1ufd cap close to the jungle chip. It will have the circuit designation in the 300's like the others in the vertical circuit. It is just not located close by. I think that one will fix it.I don't have the service data with me so I can't give you the exact designation.
Dan

Posted on Jun 04, 2008

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Guide on How to find Vertical IC

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part number
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Let us know if you need further assistance.

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1 Answer

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