This model did have problems with bad picture tubes---screen goes bright red,green,blue and set shuts down.
set also does this to protect itself---when fails look to see if specific sequence of blinks
SOURCE: Sony KP-51WS510 Shuts itself off
eight blinks means, "High-voltage error" and the probable cause location listed is, "T8005 is faulty (D board)". T8005 is the fly-back transformer assembly.
SOURCE: My Sony Color Rear Video Projector Model # KP-51WS500
I think Jean got this one right. This sounds just like the problem that this site will help you fix.
SOURCE: sony kp-51ws510 tv blinking light 6 flashes on timer/standby
6 blinks on your model means the +5V line is either overloaded or shorted on the A or B board. You can get replacement boards at the following link and they will assist you in determining which board of the two you actually may need.
http://servicemanuals.vstore.ca/
SOURCE: sony widescreen projection TV -- Model KP-51WS510
The tv is in shutdown protection due to overdriving video signal. If you are handy you can pull the front cover off and there are 6 controls on a HV block. 1 set says focus, do not touch those. One set says screen. One at a time turn them down, counter clock wise putting each one back where you found itTurn the first one down and then turn the set on. Do this for each untill you get a picture. You will most likely find a bad blue gun. You can also remove the board from each gun 1 at a time with the set unplugged and find the shorted gun. good luck.
SOURCE: Sony KP-53V25 Color Rear Video Projector Powering off unexpected
possible crt problem, they have to be reseated, if not then the convergence is failing expect to pay around $300-350
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