When the TV is turned on after being off over night, or for a few hours; the Tv powers on and the screen becomes filled with a static field and the speakers emmit a loud screeching sound. After a few seconds the TV powers itself off, then back on, and works normally.

There are repeaters for the cable TV on the way and some need power to boost the signal.

Could it be possible, If the power to this repeater is drawn from a nearby post/outlet/house that is automatically programmed to power off for 2~3 hours every night ?

PROBLEM WITH POWER SAPLY OR T-CON BOARD BAD KONTAKT

Most likely you will need to get a diagnoses performed on the set. Your problem could be with either the main board or power supply board. The million dollar question is do you repair or replace? With parts and labor to repair this set, you could come out cheaper replacing it.

Chances are some static electricity got into the TV from the power line and damaged the power board

Change Your Hi Voltage Regulator Triac Mosfet Static Problem...
The Voltage Regulator need a proper Choke to iniate a cold start_up All Sony Trinitron got Heat Problem Paste dry too fast betwen the heat_sink and the Regulator....

check in your manual and follow instructions on updating the software. you download the file to computer then move it to a memory stick (USB), then simply insert it into the tv

Sony bravia

This blue is caused by magnetic fields. Either the speakers of tv is faulty or demagnatziser not working. Switch of tv and remove powercord from wallsockets. Leave for about 10 hours and plug in powercord and switch on. if demagnatiszr is working the blue will be gone. if not have youre tv demagnetized

If hometheatre or radio speakers are closer than ½ meter this could also generate coulouration of screen. move speakers further away. If tv is on and and being moved your static electricity can also cause this. So switch of if if you move your tv.

Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505

Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly.

and some times the eprom ic is fulty ...

try to unplug your tv from the main power for 5 hours then press the power button and keep pressing for 7 seconds then release ,if this do not work ,you should take your tv to a qualified person

i hope this helps ..

Turn off tv for few hours and then turn on..

I bought my Insignia 32" LCD in November 2007 - same problem. I figured out that if you press the "input" button on your remote select any of the other options "component 1, composite 1, etc.. that you're TV isn't on -then press "input" again and go back to the component that you're TV plays on - you'll have volume when you go back every time. I've gotten so used to doing it now that it's become habit. 9 times out of 10 I have to do it.