Question about RCA P46921 46" Rear Projection Television
Have a 46in RCA pt# P46921 and the image is gone all that is left is three lines red green blue. How to fix the problem?
Hi, Your problem is what you call vertical defflection circuit section, it is very rare that you would see the three line in the midle of the screen because they have protection narmaly to shut down the set's.
How to fix this, well you must locate the vertical ship, to see what it is, it narmaly say's on it LA7830 or LA7833 or LA7838 and Bla Bla Bla look for LAxxxx , ( a small ic flat standing upward, about 11/2" and 3/4" in hight and about 1/8" in thinkness) if it look's burt when you know what to do, I would also check to see if other parts that supply's the voltage to this ic's is burt, narmaly 12 to 30 volt dc., It may be also be located on a seperat board with the convergence, these or two big ic's starting with the part # STK, not to shure on you unit, don't have the schematic, but may be a board with lot's of Transistors , narmaly now these day's no one repair board, they just replace them, this is why it cost so mutch to fix.
I hope this help's
What About Bob
Bob
Timmins, Ontario
Posted on Feb 24, 2008
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I have the same problem. I took the back panel off and the projection lights look ok so I am not sure where to go from there.
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