Question about Zenith B27A11Z 27" TV

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Help my set comes on then off. once i unplug the set from the outlet and plug it up again it comes on and then back off each time.

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Your TV swithes itself off, probably to standby to protect from doing further damage. If you, or an experienced friend have any idea of the power supply voltages in the set, then get him to monitor each voltage when you switch on. Bear in mind the chassis metal may be live at 120 to 300 volts, and keep clear of the line output transformer. You may have to use the old type analogue volt meter with a pointer and scale, as the reading may only be there for a second or so. Remove any dust so that you are sure to see where to connect probes. There is usually an electrolytic capacitor for each voltage to connect the probes to. If the negative side is at chassis potential, then clip the negative probe to this. If no reading is measured across one of the electrolytic capacitors, then this, or another component, may be short circuit. The rectifier diode or a fuse will have blown, or be overloaded. The fault is detected by protection circuits, which cause shutdown to standby. If you can locate the protection circuit, its input data (voltages) may give you a clue where to look.

Posted on Jun 19, 2007

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Sounds like you have an overload somewhere in your TV. It's not a direct short in the power supply itself but one of the circuits powered by the power supply. Most likely it is in the horizontal output circuit. Stargazer

Posted on Jun 16, 2007


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