20" Sony Trinitron - no signal
Jerry Stackhouse
is turned on in the AM, it cannot see the cable signal (no cable box
involved). Auto tune will not pick up any channels. Choppy static is
all we get. A vcr connected to "video" ports on the set works fine.
Our other set works fine so it is not a cable problem. I also checked
connections from the set to the street.
If I turn the set on and off several times it will eventually come on
fine. Also, when it has been running we occasionally get a loss of
signal the lasts for only a small fraction of a second - almost
unnoticable. . Any ideas?
Jerry G.
This sounds like a fault in the IF or Tuner module. Sometimes it is a
bad solder connection inside these modules. This is tricky to find
because it is all surface mount components and uses very high
frequencies. You also would need a special jig to work in these
modules activly.
I mostly just replace the defective module. The time in labour costs
can exceed the price of the module. I do some tests to determine
which module is bad, and then replace it. You would have to have a
qualified TV service tech with the proper test gear do this for you.
--
Jerry Greenberg
http://www.zoom-one.com/electron.htm
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Jerry Stackhouse wrote in message <36bd8aa7...@news.snet.net>...
Glenn Watkins
It would have been helpful if you would have included a model number
but from your description I'd say you should remove the tuner and go over
the solder connections inside it. These late model Sony tuners are well
known for bad solder work. (all ground connections)
Glenn Watkins
mailto:blue...@comcat.com
Dakuhajda
factory.
But they have solder connection problems to the grounds inside the tuner,
especially the one right next to the pins at the bottom of the circuit board.
While you are inside you will need to resolder all the pins that go throught
the main circuit board as well as all the ground posts.
David
Kevin Carney
How do you know if it is the tuner or the IF module ?
Having worked on these I start with the IF then do the tuner.
Any tricks to narrow it down would be great.
Regards, Kevin
Jerry G. wrote:
Tom MacIntyre
>I have a 20" Sony stereo TV that is about 5 years old. Lately, when it
>is turned on in the AM, it cannot see the cable signal (no cable box
>involved). Auto tune will not pick up any channels. Choppy static is
>all we get. A vcr connected to "video" ports on the set works fine.
>
>Our other set works fine so it is not a cable problem. I also checked
>connections from the set to the street.
>
>If I turn the set on and off several times it will eventually come on
>fine. Also, when it has been running we occasionally get a loss of
>signal the lasts for only a small fraction of a second - almost
>unnoticable. . Any ideas?
Just did one today, about 8 years old...did the tuner, IF, and lots of
bad connections on the main board, including the 30V line to the
tuner...the set works fine now, and that was my goal.
Tom