12 Aug
2014
12 Aug
'14
5:53 p.m.
On Tue, 12 Aug 2014, drlegendre . wrote:
My best Commodore monitor, the 1084, went belly-up on
me today. It's been
showing sings of trouble for quite a while, but this time it finally failed
over.
[snip]
Anyway, it turns out that this is one of those sets
that draws its heater
supply from a second winding on the HV flyback transformer. After some
inspection of the board, I found that one of the flyback's soldered
mounting pins had cracked at the joint, causing an intermittent connection.
This was the cause of both symptoms - a quick cut-out of the video when the
HV disappeared, and the slower fade-in as the connection re-made and the
heater warmup lagged the HV rise.
This seems like bad-news / good-news. It sounds like the problem is
fixable.
--
David Griffith
dgriffi at cs.csubak.edu