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I'm not a service tech, but, I do have a copy of the service manual. It says the TV has a self diagnostics and according to the chart, 4 flashes indicates a backlight failure.
Usually this happens to my set when I am in HD cable channel mode after being on a non-digital ANALOG channel.
I basically reset the TV by changing to a DIGITAL cable channel -- stay on that channel for ten-twenty seconds -- then I switch back DIRECTLY to a HD channel (key in channel number directly on remote).
TV works fine -- seems to be a glitch when the TV changes modes from Analog to HD
try cycling the power (unplug 2 minutes) and plug in and wait 30 seconds and turn back on. if this doesn't work, could have been a surge, your protector should have saved it, but could have been through cable or something. surge protectors will guarantee no damage for several years, check with the manufacturer maybe they'll cover the repair.
if you are have problems with in built speaker when the tv speakers are on, then connect on audio out hi fi
audio out. and make sure your speakers are on off.
I had the same problem with this model, seems to be a common problem across much of the recent sony range. For me the problem stopped when I unplugged the external aerial (not much use if you want to use freeview, but maybe some indicator of source of the prob ?)
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