Sony eSupport KDL 42W800B Support
SONY eSupport NO SIGNAL message is displayed on the screen or the TV is... (or no picture)
You may need to download a manual and it may require the devices serial number to access such.
SOURCE: tv turns on has sound
Have flashes of picture about 30 sec, or so?Than the 2 long LCD inverter boards are dead,have backlight make no difference.Tries to reset the tv back to factory setting by,unplug,replug the tv and cable box back about an hour later,let the tv Tuner board to reset it self,the cable box upgrade it softwares.After this,u still have the same problems,than the Tuner board is dead.Tries websites like Shopjimmy.com,Ebay.com to buy the 2 long refurbishes LCD inverter boards or the Tuner board for the replacement.
SOURCE: sony kdl-52s 4100 power supply ok but no sound and display
Well, if the power supply is in good working order, you will need to verify that the proper voltages are getting to the main board. If the main board is getting the proper voltages, I would bet you have a defective main board. The video and audio signals are generated on the main board. Expect to pay $100-$150 for a replacement main board.
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