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Re: GE 31GT740 problem
Sounds like you could have a bad Picture tube, as the filaments may not be lighting, as they are open, or maybe a video problem, or perhaps a problem in the Sweep power supply. This is an inexpensive TV set and will most likely cost more to repair then you could purchase a new TV for. Good Luck
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The problem of your tv is the tact switch it is already dirty and contacts.The vibration of the sounds triggering the tact switch when the sound is producing a bass. Replacing the tact switch will resolve the problem. Good day and best regards.
I think that the problem of your tv is the flyback transformer. The noise you are hearing is the high voltage, it is leaking from the flyback transformer. The smoke you see may came from the flyback or the capacitor. To be sure to the problem, try to remove the back cover of your tv but be sure to unplug it. Try to plug it, then turn on your tv but you should turn of the light so you could see the high voltage that is leaking but be very careful when doing it.
There is possibly a loose solder joint in the horizontal drive circuit. There is a little coupling coil just before the horizontal output that will get loose. This should not be real expensive to have repaired.
This is the deal. Your picture tube is going out. How thick is the line. As it gets wider that will tell you how much more time you have. Was the TV dropped? There is a way to adjust this but you have to get into the back of the TV and if the static discharge is not done properly it will kill you. Don't mess with it. It is now cheaper to buy another TV on craigslist or your local paper than trying to repair it. Hope this helps. JimmyC
Dead, led flashing red/green at first, then going to red standby
Replace C604 (1000uF, 16v) elec. cap. It is in the decoupling circuit for the 5 volt supply
Reverts to standby from switch on via TV or Video
No 5v rail because FET MTP3055 o/c. (BUZ71 will do nicely)
Goes straight to standby, after a quick burst of power
Replaced R952 (39K), had gone slightly high
Replace sound i.c (TBA120U)
No sound, picture ok
When shifting up the channel frequency using the fine tuning, a very
weak sound could be heard. Replaced the sound IF demodulator chip
I found one of these that had an inductor coil
which is in series with the hoizontal output transistor base open up. It had a bad solder connection where it goes through the circuit board. This might be what happened to your tv.
If so, it needs to be resoldered.
What happens is that you loose horizontal drive and since the voltage that lights the filiament of the picture tube is derived from the flyback transformer this voltage is gone.
Another possibility is that you may have an opem filiament (rare) or a loose connection on the picture tube driver board which is mounted on the neck of the tube.
yeppers its a g2 control on the flyback thats gone or drifted out of alighnment or the flyback its self.Try turning the g2 control dowm till those lines fade. If they wont go away then you need someone to check the Picture tube or its componets driving the crt.