Question about JVC Televison & Video

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It works for about 2 hours then just shuts down. The blue "on" indicator light simply flashes on and off. If I try to shut off the TV, nothing happens. If I unplug it and wait for a few hours and plug it back in, it comes on as thought nothing ever happened. How do I fix this?

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  • sicilian01 Jul 29, 2008

    THIS IS NOT A PROJECTION TV, IT's A FLAT SCREEN HDTV

  • sicilian01 Jul 29, 2008

    32" JVC I'Art HDTV. This is a flat screen pic tube model, NOT PROJECTION. Plays for a couple of hours then pic and sound go away and the blue on light flashes on and off. Only way to shut it off is to unplug it. Then if we leave it off for several hours and plug it back in it will work for a couple and go out again.

  • sicilian01 Jul 29, 2008

    I'm pretty certain it's not cold solder joints causing this problem. It worked fine for a long time then this started. Something makes me think it may be power supply related but I'm not a tv guy.

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  • Master
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The blinking light is an indication that the set is in protective shutdown. A problem has been detected and the set is shutdown to prevent further damage. While a poor solder connection could be the cause here, there is also the possibility that a defective component is the problem. Does the light blink in any type of pattern? Usually theprotective shutdown will trigger an indication circuit that will blink the light a different count depending upon what type of defect was detected. CAn you post that count here?

JVC sets are difficult because service information is not available outside of authorized service centers. Whether the problem is a bad connection or defective part, it is most likely within the power supply area.

Please keep us posted.

Dan

Posted on Jul 30, 2008

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Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the LCD TV turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough.

Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder".

Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing....

Good luck:

Regards,
VOTIT

Posted on Jul 29, 2008

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  • JVC Master
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It goes on stand by because of overheating, if it is a traditional projection tv it is usually a ballast problem or a problem on main pcb board. If it is a LCD , Plasma etc, it can also be the external poer adapter giving overvoltage after a while.
In first case you need a tv repaiman in second test and eventually replace power adapter.

Posted on Jul 29, 2008

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