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This may help if the tv as a 3.5 ear phone socket try your earphones & see if the sound works if it do's then its prob the switch in the ear phone socket that's @ fault and norm inserting & pulling out the ear phone plug a few times can clear it
The first thing I would check is the line output transistor this is the large transistor mount on the heat sink next to the lineoutput transformer (the big black thing with the lead going to the side of the tube) just replace it if you have no meter to check it.
The GE (actually RCA) 31GT660 uses the CTC187 series chassis. This chassis is notorious for bad solder joints on the shields around the tuner and microprocessor. When the solder joints on the shields crack, the microprocessor and EPROM lose their ground and the EPROM's data becomes corrupt. The solder joints on the shields will all have to be resoldered and the EPROM reprogrammed or replaced by a qualified tech familiar with the 187 series chassis.
When this happens it is invariably the SMPSU, (Switched Mode Power Supply Unit), Generally the "Chopper" transistor has faulted. o you could either simply buy a complete PSU OR fix, replace, the faulty part. Then ya should be good to go.
Sounds like you have a short somewhere, probably the Horizontal Output Transistor. If there is a fault the led you mentioned probably should be blinking. You probably are going to need a tech to look at this as it is a very complicated process of elimination.