mikemaiertv
Enthusiast
Aug 3, 2007, 8:22 PM
Post #4 of 5
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The old blinkie L.E.D. is basically a starting point. It tells ya where the set thinks the problem is. But they are not always right. The four blinks tells ya vertical has stopped and the set has shut down, now this is where an expearnced tech comes in to play. With Sony projections there weak link is NOT the vertical IC. We would probley go to the convergence IC’s first. Why would we do this? If you can follow on the attached schematic you can see the vertical IC on the top right, from pin 2 you see the B+ supply voltage. Now follow that around and you see it ties directly to the B+ for both convergence Ic’s then travels down to a fuse, Now if the convergence Ic’s fail ( And this is the most common problem with this type of set ) it will open that fuse and kill power to the vertical and that gives you the 4 blink dead vertical code. So if you are a little low on test equipment and experience, simple test the two fuses to see if there open, and if they are change both convergence Ic’s and the fuse first, then worry about the vertical if the set won’t start.
Mike Owens Owner Competition TV Spokane WA.
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