Our TV works for several hours and then turns itself off. A couple of minutes later, it turns itself back on again. Then it goes through the on/off process several times within a short timespan (a few minutes on, a few minutes off). We turn off the TV let it cool down. Turn it on and it is good for another several hours.
Could it be a fuse? If so, can we fix or do we have to call a repairman?
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i have had this problem on one of my tv s all i did was remove the back of the tv and re-solder all the joints around the tuner (thats where the arieal goes) they go with time because the joints there get so hot . hope this helps
Check the "Sleep Timer" settings. If set to 45 minutes then TV would automatically turn itself off 45 minutes from being turned on. The variance in the "on" times is due to the TV turning itself off after not getting a signal from the remote for fifteen minutes.
According to Sharp it is a software problem. Engineer came, installed software update ,10 minute job.....TV worked fine for 1/2 day unfortunately: Then images turned black and white in all channels TV turned itself off, and stanby and OPC buttons started flashing. When TV came back on its own 10 mins later , screen had 2 large square staines superimposed in image (as if it was a burnt screen)...Engineer will be back next week...all quite sad really for a new TV.....will keep u posted
alright guys...blew a bulb....fixed that. still didint work...found out it was ballast...replaced that. tv worked for a month..all the sudden hdmi input didint work id plug in my playstation and screen would turn green and say "hdmi color has been corrupted" im thinking wtf? so a week later it works fine then just turns off in middle of watching espn... comes back on an hour later...only to turn off again...it just turns black for ten seconds then just turns off and the red and green lights blink at intervals of one second....replaced a bulb..not that, same problems.......when the tv comes on for the ten minutes before it quits working the pic and sound are great i just dnt get it...is it shorting out? color wheel bad? a fan?
It's probably a cracked solder joint in the power supply / horizonal drive stages. As the unit heats up the joint is seperating and breaking connection. It could also be a component failing when it gets hot. Usually the voltage regulator or Horizonal Output Transistor (both mount to heat sinks).
If you know how to solder and want to tinker, unplug the set for a couple days (to let the power capacitors discharge) and resolder and crystalized it cracked joints on the board(s) where the power stages, and flyback transformer are located.
If you decide to operate the set with the back off, please be careful. The high voltage on a TV can be 30,000+ volts.
the problem may be due to dry soldering in the power supply stage if it was with the lamp there would be red or green light showing the presence of the power to the tv after making it own some of the components get hot and it will make the the soldering point conectionless and after some time the heat sink get cooled and the soldering point gets connected and u will see the picture again it is a simple problem if u have a soldering iron u make it hot and re solder all the components in the first part of the circuit board and the problem if rectified