Question about RCA P46921 46" Rear Projection Television
Menu displays but no picture. 3 guns are working. No smell of anything burning. Figure it might be rf converter. Is it possible to troubleshoot to component level? Can a module be found for the tv? thanks.
Has a good sound, a no picture symptom is definitely in the video amplifier circuits. First monitor the signal at the base and collector of video amplifier and at the cathode of the picture tube .This should be followed by measurement of the video amplifier transistor element voltages .As in the case of any amplifier, total failure of the circuit is usually easy to locate.Look for such defects as open coupling capacitor and coils, cold solder joints, open or worn ,breaks in printed circuit connection.Keep in mind that video output amplifier is a power transistor and is therefore subjects to being burned out if its heat sink is defective.Also try to set the brightness to minimum.When the vertical deflection is lost the beam current is concentrated in a single horizontal line across the screen .
Find a local technician there to do works for you , in order to avoid high voltage shock.....
Posted on Jul 04, 2008
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