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Re: TV goes on for minute, and then goes to standby
This could be anything but is more than likely a problem in the power supply or control board. There really are not any user serviceable parts in these units and they have dangerous voltages. Repair is best left to a professional.
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Do a hard reset to this set, and check. To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight; will be better. If it do not help you, check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
I am experimenting with Insignia's and there is a feature whereby if a signal is not detected the TV will switch to standby mode (in about 10 - 15 minutes). It's documented as a tiny "note" in the manual under "Understanding the basics - Turning TV on or off"
I don't know if the TV resumes when the signal is restored or if you need to power on manually.
You are probably experiencing a glitch with the signal or the TV thinking the signal is not there. Are you watching a clear picture when this happens? I would first check to see if the signal is too weak (like using a signal booster). If that is not the case, it's probably the TV acting up.
This can be many types of faults. The set will need shop service. There may be cold solder connections on one or some of the boards, or there may be come components that are intermittant. In anycase most of the time, there will be the need for board replacments.
The cost for this type of repair can be fairly expensive. I would consider investing in to a new set because after having this serviced, there will still be many older components in the set that can potentialy fail.
Your problem is probably in the power supply as theres a voltage called the sustain voltage that is always keeping the screen charged so the address lines will activate the screen and make it light up Via the Microprocessor and the video processor. This is not a repair for a handy person as this set, you can cause more problems Please seek out a trained tech for this set. Good luck