I have a 2004 Hitachi Rear Projection TV 65SWX20B. About two months the picture would go off intermittently but sound stayed. After a turn off and on, the picture returned. More recently the picture is totally gone but sound is there. Bought it from Sears but after 3 of vtheir techs inspected it, the problem remains. Please advise.
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Likely a bad solder connection exists and was advanced when set go moved---you might with set not plugged in want to remove cover and with flashlight have a real good look to see if any plugs loose or off.
If the board with the blinking LED has larger than average parts on it, it is likely the main power supply and the clicking may be from a relay that is connecting and then, disconnecting the AC.
With no video or audio, the main power supply has likely failed.
Contact Hitachi service to ask how much the repair or replacement cost of the supply is.
Make sure you have all involved model numbers handy; the one from your set with the mfr. date if present and if you can find an assembly number on the power supply itself. it may save you time and errors.
These boards are often simply plugged into other assemblies with dissimilar plugs but if you decide to DIY, take some snapshots of the cabling to be on the safe side.