Question about Zenith B25A02Z TV

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Logik lt2974 small picture

Tv was playing and it started to flikker and then the picture was crammed into a small horisontal band of about 5cm high, i switched the tv off and on again, each time the picture band seems to get smaller, cannot find the scematic. any ideas of where i can check or what to look for .

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  • 318 Answers

The problem is in the verticle section, if you are a technician check a verticle IC and a capacitor of that stage. to allocate a verticle stage follow 4 cables coming down from deflection coils, two of these wires goes near transformer, this is horizotal and the other two goes near an IC this is verticle. positive idea.

Posted on Mar 28, 2009

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IF THAT FAILS THE PICTURE GETTING WIDER AND SMALLER CAN BE CAUSED BY EIGHTER THE COIL, HORISONTAL CIRCUIT OR VERTICAL CERCUIT.. most often its just a capicator.

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1 Answer

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I would try adjusting the screen control on the flyback. The flyback can be easly located, find the red wire attached to the top of the picture tube & follow it down to the flyback. on the flyback you should find two controls, one screen & one focus. you sould be able to read the words above each control, only adjust the screen one. slightly increase the control till the picture stays on, if you turn it too much you will get small white lines going across the screen. Now if what i have told you fixes the set, then it is only a tempoary repair. could last days or mothes, maybe years. if it starts to happen again later the set will have to be replaced. this is a sign of the picture tube starting to get a weak. ALSO DO NOT PLAY WITH THE RED WIRE IT CARRES VERY HIGH VOLTAGES EVEN WHAN UNPLUGGED FOR DAYS.

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