Question about Polaroid FLM-3734B 37 in. LCD HDTV

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TV won't turn on until it has been unplugged

Everytime we turn on the tv we have to unplug it and plug it back in. When it does turn on there is a loud buzzing noise, that goes away after a minute.

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Hello, If you can turn it back on with the momentary key or power button If once, then the controller is shutting the TV down either as a result of a (thermally induced) fault in the controller or it sensing some other problem. Monitoring the voltage on the relay coil (assuming these is one) could help determine what is happening. The controller thinks it is in charge.
If twice, then the power supply is shutting down as the controller still thinks it is on and you are resetting it. A couple of possibilities here would be low voltage or high voltage regulation error (excessive high voltage is sensed and causes shutdown to prevent dangerous X-ray emission). A partially dried up main filter capacitor could also cause a shutdown but there might be other symptoms like hum bars in the picture just before this happened. Clipping a good capacitor across the suspect (with power off!) would confirm or eliminate this possibility.
If it uses a pull-knob (or other hard on/off switch), then this may be like pulling the plug and would reset any abnormal condition. This procedures require a skilled technician to do this and require opening the back cover of the television.

Posted on May 16, 2010

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