"Chuck" wrote in message
...
On Thu, 12 Jun 2008 20:02:59 -0700 (PDT), "Tim R."
wrote:

I have an old Zenith A1920W TV from 1984 that works great except for
one small problem.

When I first turn it on, I will get nothing but static on all
channels, and then it will suddenly clear up and work fine. It will
alternate between working and static for a little while and eventually
work normally. After that I can watch for hours with no issues.

Is it an overheating component? Or something expanding/contracting and
making intermittent contact? If anyone can point me in the right
direction I'd appreciate it.


Tim


The tuner in this set usually will have broken solder connections,
particularly at the sockets where the wire bundles run back to the
main board.. The shield on the tuner will need to be removed. I
think it needs to be desoldered, resolder all socket pins, touch up
poor ground connections and it should work ok. Chuck
Could be anything from the tuner through to the video processing, however
having snow indicates that most of the circuitry is operational excepting
the tuner. Suspect voltage sources to the tuner also, dried up electrolytic
can cause a very slow rise, and poor regulations in power supply voltages.
Suggest ESR the caps in the power supply and any circuits directly related
to the supplies for the tuner.