Sony Trinitron KV-1921

[Findm-Keepm]

Originally Posted by Jon A.

Thanks for the info. If that's what it takes to get a near-mint SG-613 Trinitron running reliably, so be it. Looks like I have lots of studying to do.

or, recap, and replace the SG613 with an original, and replace the damper diode with the Sony suggested replacement for reliability. We did this in the 80s to Sonys we serviced, and had only one callback - for an unrelated CRT issue.

Most SG-613's we saw were killed by lightning strikes/surges. A V130LA10A or equivalent across the AC input would likely solve this. Honestly, most Sony's got the 4.7uF treatment - the 4.7uF 160V and the 4.7uF 250V caps would be bad, with high ESR and low value, nearly open. We kept a stock of 4.7uF 250V caps in stock to replace both the 160V and the 250V ones. I've got some 200 or so Sony service bulletins, and those 4.7uF caps are the only recurring parts in the bulletins. Most Sony bulletins are part number changes, so having them comment on any part as suspect makes you realize Sony also knew of the mass failures.