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You hereby reports that the one side of the screen do not display picture, and the other side have. Is it seen vertically or horizontally. Will you please provide a detailed description of the fault you see on screen? google.com/+GopakumarGopalan
This set has a shorted horizontal output transistor and possibly a bad high voltage transformer. If you repair the set, also solder the horizontal drive for the transistor listed above. Try www.encompassparts.com for parts. the h-ouput transistor is p/n: 223942 and the transformer is 223952 .Thanks and good luck.
Is the brightness in the middle of adjust range? Is the picture
or contrast adjust at 3/4 ? Next,adjust the screen voltage on
lower rear of cabinet = one control is focus and one is screen..
how is the picture now ?..........................T.
I had the same problem. I found the solution in this link. http://www.techlore.com/forum/thread/13480/?page=1
The only thing that wasn't clear was how to get into the service menu. With the TV on, press and hold the MENU button on the front panel of the TV and press POWER then press VOL+.
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.