Magnavox TV: Horizontal Line
dale @hotmail.com Dale Cartwright
I have a problem with a gorgeous old Magnavox Videomatic 27" console
television that doesn't line up exactly with any item on the repairfaq.com
television repair guide (although, it's probably related to the "single
horizontal line" problem). The television one day, delivering its perfect
picture and audio as always, squeezed into a bright horizontal line.
Turning the television off and then on fixed the problem, for days, but then
it happened again. Soon you had to turn the television on and off quite
often, when the picture was squashed. Now, the picture is squashed and
jittery for only seconds before giving up and becoming the horizontal line.
I've ruled out problems with the service switches and I don't see any loose
connections, although it seems to behave as such. The cheapest I've found
for a person to come out and take a look would be $100+, and for such an old
television it hardly seems worth it. Any ideas?
http://www.spartancity.com/problem.rm is a little video clip that shows the
problem exactly. Just thought I'd give this a shot!!
Thanks,
Dale C.
cartwrightdale @ hotmail
Jerry Greenberg
circuits. The fee of $100 is reasonable to have it looked in to, when
considering the person comming to you has to make a living, and the
business expenses, taxes, and ect are part of the overhead. If it is
a few of the capacitors, the parts would not be very expensive.
I doubt you would be able to troubleshoot and service this yourself,
unless you were properly equiped, and knowledable in TV servicing.
Jerry Greenberg
http://www.zoom-one.com
--
"Dale Cartwright" <cartwright dale @ hotmail.com> wrote in message news:<aol8c7$ttj$1...@msunews.cl.msu.edu>...
---MIKE---
dirty. If you can find it, try adjusting it which could clean it. BE
CAREFUL -voltages are very high.
-MIKE
Arthur Jernberg
vertical output device, coupling capacitors, and yoke connectors. Passive
devices such as electrolytic capacitors, coils, and resistors to/from power
supply circuits. If your tele is more than 10 years old dump it and get a
newer product. $100 USD is a fair price to diagnose and attempt service,
depending on age and configuration. Older products may not have replacment
parts available at any repair cost.
"---MIKE---" <twinmo...@webtv.net> wrote in message
news:11859-3DA...@storefull-2316.public.lawson.webtv.net...
Jack
output IC.
"Dale Cartwright" <cartwright dale @ hotmail.com> wrote in message
news:aol8c7$ttj$1...@msunews.cl.msu.edu...
Robin
> Bad solder connections in the Vertical deflection circut, most likely on the
> output IC.
>
>
>
> "Dale Cartwright" <cartwright dale @ hotmail.com> wrote in message
> news:aol8c7$ttj$1...@msunews.cl.msu.edu...
> > Greetings! (also posted to s.e.r)
> >
> > I have a problem with a gorgeous old Magnavox Videomatic 27...
<snip>
Yes these symptoms seem to be "mechanical" and if so you could "find"
it by tapping the components with something long and thin and
insulated e.g. a garden cane (keep your other hand in your pocket and
all other parts of your body at least a foot away from everything).
Use a mirror to see what happens to the "picture" as you tap.
Supply the TV signal with a home computer's UHF output programmed to
give a static black background display with a tiny amount of white in
it otherwise the horizontal white line (of a squashed TV program, or
background noise) will burn itself permanently into the CRT's display.
With luck, as you approach the area, the picture will expand/collapse
more or less, in which case you might get it down to the actual
component which maybe as suggested in the above post i.e. a fatigued
soldered joint or burnt plugged joint.
If you do locate it, remember that even after it is switched off,
there is still 25,000 volts stored within the CRT that will bite you
if you touch any of the components that surround the area connected to
the "fat" wire running to the side of the tube. You should discharge
this first using two insulated screw drivers.
When I used to do this work professionally, we always had at least one
other person present.
Robin
Glenn Gundlach
What is a 'home computer's UHF output'?
GG
Robin
<snip>
> What is a 'home computer's UHF output'?
>
> GG
Originally home computers (before PC clones) did not come with a
monitor. You used your TV instead.
My computer, A BBC Micro', had a UHF output for this purpose (as well
as an RGB + syncs for a colour monitor and "composite video" for a
monochrome monitor).
It was easy to program a "cross hatch" in Basic i.e. a white grid with
a circle that could be used to align a TV's display otherwise you had
to buy x-hatch generator which was expensive.
Robin