Sony Trinitron KV-1921

[Findm-Keepm]

Originally Posted by Jon A.

I assume these were known for purity issues as well. I forgot to mention the image is darker at the top left, just like on my decade-newer KV-1926R.

A ure sign there is a bad cap - shading of the left hand side of the screen is a common B+ filter problem with Sonys.

Check the ESR on all the caps in the B+, vertical (save the 2SC867 or 2SC1034!!) and the horizontal sweep, and you'll likely fill a mug with bad caps. Sony used good caps, it's just age that kills them - they've met their 5,000 hour service life.

Even after getting a set running, we'd run through the caps, replacing any marginal caps. Nothing worse than a call back for one stinkin' cap...