[xamman]

Hi! my philips 28" tv which was giving erratic picture and making a
buzzing sparking sound.
from usenet posts & faq, found the noise was coming from the crt
socket.
i carefully opened the crt socket & cleaned contact which clamp on the
input wire.this socket had a spark gap built in with 2 metal
hemispheres. on 1 side of the spark gap i noticed a tiny glob of metal
which fell off on cleaning.
TV is now working. No more sparking noise! but the picture is slightly
less focused - it is hard to read tiny text (like satellite channel
info) on the screen. & there is a very faint narrow almost horizontal
line every inch over the entire screen.

what cause the socket failure?
what is causing this line?
did i need to re set the focus after cleaning the socket?

Many thanks
X

[[email protected]]

xamman wrote:

Hi! my philips 28" tv which was giving erratic picture and making a
buzzing sparking sound.
from usenet posts & faq, found the noise was coming from the crt
socket.
i carefully opened the crt socket & cleaned contact which clamp on the
input wire.this socket had a spark gap built in with 2 metal
hemispheres. on 1 side of the spark gap i noticed a tiny glob of metal
which fell off on cleaning.
TV is now working. No more sparking noise! but the picture is slightly
less focused - it is hard to read tiny text (like satellite channel
info) on the screen. & there is a very faint narrow almost horizontal
line every inch over the entire screen.

what cause the socket failure?

probably just dirt on the thing caused it to arc.

what is causing this line?

retrace. Just turn the brightness knob down very slightly and it'll go
away in many cases.

did i need to re set the focus after cleaning the socket?

sounds like it. Use an insulated tool!


NT

[xamman]

thanks for the tips. I set the focus & brightness from crt neck & now
picture is as good as new!


however i would like to determine if that tiny glob of metal on the
spark gap is due to a failing or weak part somewhere else on the TV

what components could contribute to this?

thanks

X

[James Sweet]

xamman wrote:
thanks for the tips. I set the focus & brightness from crt neck & now
picture is as good as new!


however i would like to determine if that tiny glob of metal on the
spark gap is due to a failing or weak part somewhere else on the TV

what components could contribute to this?

thanks

X



Glob of metal? Could it be a leftover blob of solder that worked its way
in there?

[xamman]

Glob of metal? Could it be a leftover blob of solder that worked its way
in there?

thx for your reply but there are no soldered parts in the vicinity of
the spark gap inside the socket. it looks like molecules from the
metal hemispheres of the spark gap have contributed to form the glob.

the glob was in the centre of one of the hemis, the one the focus wire
attaches to.

X

[xamman]

xamman wrote:
Glob of metal? Could it be a leftover blob of solder that worked its way
in there?

thx for your reply but there are no soldered parts in the vicinity of
the spark gap inside the socket. it looks like molecules from the
metal hemispheres of the spark gap have contributed to form the glob.

the glob was in the centre of one of the hemis, the one the focus wire
attaches to.

X

[[email protected]]

xamman wrote:

thanks for the tips. I set the focus & brightness from crt neck & now
picture is as good as new!


however i would like to determine if that tiny glob of metal on the
spark gap is due to a failing or weak part somewhere else on the TV

no

what components could contribute to this?

none


NT