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First thing to try is unplug the set and a box or receiver if you use them for several minutes from power, then plug things back for power and see if that helps.
Second, Sony is one of the few companies who uses the same access code to reset all their sets for the last 20 years, if it comes on and responds to the Sony original remote you can try that,
set is off, Then with the remote Display, 5, volume up, and power.
If set comes on you should be in the service menu---do not by accident touch any buttons randomly : what you want to touch is 8 (reset or write should appear on the screen in red, then hit enter and the word should change to green and the set shut off.
turn back on with remote and see what happened or not.
You might have bad capacitors still that you cannot see. The only way to be sure is with an ESR meter. Check all the connections on the boards again to be sure that the sensor for the remote did not come off.
Resetting the TV If the buttons on the remote AND the buttons on the TV case do not work (channels do not change and you cannot open or navigate the menu), the TV has stopped responding. Reset the TV as follows:
NOTE: Some TVs have a reset button. If available and accessible, try using the reset buttons before using the steps below. Using the reset buttons can save time. 1. Unplug the TV power cord from the power outlet. 2. Unplug any connected devices (DVD, Set-top boxes, etc...) 3. Press and hold the TV power button for five seconds. 4. Plug the TV power cord back into the power outlet and turn on the TV. 5. Open the on-screen menu to confirm that the TV is responding again. 6. Turn off the TV and reconnect the devices. 7. Turn on the TV.
LCD TV TroubleshootingThe defective LCD TV may have the following common symptoms:
Symptom: No picture on screen but LCD TV still has sound. Solutions: The problem is cause by defective inverter. Replacing ivnerter will solve hte problem. Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound. Solutions: The problem is cause by defective inverter. Symptom: Blue Screen but no picture Solutions: The problem is cause by defective Main Board(AD Board). In some cases, this problem may cause by the defective Screen Controller board. Thsi board is mounting on teh back of LCD TV Scree. Symptom: Power light stays on but no display and sound Solutions: The problem is cause by defective Main Board(AD Board) or Power supply board. Symptom: No Power or Power indicate light does not lits Solutions: The problem could cause either by defective Power supply board or defective Main Board(AD Board). Symptom: Screen is half dim and half bright Solutions: The problem is cause by defective LCD Panel.It needs to be replace.