Pin Cusion Distortion on old RCA TV
 

I have a 15 year old RCA F27120WN that has just developed what I think is
called "pincushion" distortion. The entire picture is filled in, but
vertical lines near the sides are bowed inward. (Horizontal lines are fine.)
Any particular circuit or component I can check? Other than the pincushion
distortion, the set still has an excellent picture.

I'm experienced in electronics and radio design, but not so much with TVs.

--
Bob D.

Pin Cusion Distortion on old RCA TV
 

On Mar 30, 7:31*am, "Bob Donahue" wrote:
I have a 15 year old RCA F27120WN that has just developed what I think is
called "pincushion" distortion. The entire picture is filled in, but
vertical lines near the sides are bowed inward.

Usually the horizontal sweep circuit has a 'pin amp' transistor
((basically, the Hsweep drive is a high voltage, but instead of
returning to GND, current returns to a low voltage pincushion
amplifier). The pincushion symptom often means the
transistor has shorted (or otherwise lost gain).