AVS Forum Special Member
Join Date: Dec 2009
Location: Springfield, MO
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You can try the service mode. Be forewarned that a wrong press can brick the tv so the A board would have to be replaced.
Press Volume on the tv and Info on the remote 3 times. This will get you in. The go to Aging to get a test pattern. Then use the 3 and 4 buttons to scroll through them. To exit use the power button or unplug it.
If you get nothing you have a bad A board or panel.
Source: ST50 troubleshooting manual.