Zenith SY2568s

[Carl M. Pratt]

I have 1996 a zenith SY2568S I replaced the vertical deflection IC TAD8174
with NTE 5818 replacement which is the same ST chip, after about a year old
after a lighting storm and I think one low Ohm resistor from the flyback.
Checked the caps around it and it worked until just resently. It made a
poping noise when turned on and the Vertical IC had a chunck blown out of it
just as it had the first time i replaced it 4 years ago replaced all the
caps around it , checked resitors trasnistiors dioeds resoildered and try
connections. Now the TV has widly spread vetical retrace lines that fold
back to about the center of the screen and the folded back retrace lines are
mirrored at the bottem half of the CRT. Don't have a schmatic and would
like some help with this one.

 

[Carl M. Pratt]

So Jamie, what are you saying? That something is shorting out the fly back
or the fly back is shorted internally and needs replaced. I find nothing
shorting the fly back. and every thing else looks good and works good. I can
adjust the focus and G2 but still have the vertical fold-back. also tried to
replace the Vertical IC again in case it was damaged.


"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:102u3674mcj8p64@corp.supernews.com...

almost sounds like your flyback is shorting out giving it alittle more
juice than it expects!
)


Carl M. Pratt wrote:

I have 1996 a zenith SY2568S I replaced the vertical deflection IC
TAD8174
with NTE 1858 replacement which is the same ST chip, after about a year
old
after a lighting storm and I think one low Ohm resistor from the
flyback.
Checked the caps around it and it worked until just resently. It made a
poping noise when turned on and the Vertical IC had a chunk blown out of
it
just as it had the first time I replaced it 4 years ago replaced all the
caps around it , checked resistors transistors diodes resoldered any try
connections. Now the TV has widely spread vertical retrace lines that
fold
back to about the center of the screen and the folded back retrace lines
are
mirrored at the bottem half of the CRT. Don't have a schematic and
would
like some help with this one.

 

[Jamie]

almost sounds like your flyback is shorting out giving it alittle more
juice than it expects!
)


Carl M. Pratt wrote:

I have 1996 a zenith SY2568S I replaced the vertical deflection IC TAD8174
with NTE 5818 replacement which is the same ST chip, after about a year old
after a lighting storm and I think one low Ohm resistor from the flyback.
Checked the caps around it and it worked until just resently. It made a
poping noise when turned on and the Vertical IC had a chunck blown out of it
just as it had the first time i replaced it 4 years ago replaced all the
caps around it , checked resitors trasnistiors dioeds resoildered and try
connections. Now the TV has widly spread vetical retrace lines that fold
back to about the center of the screen and the folded back retrace lines are
mirrored at the bottem half of the CRT. Don't have a schmatic and would
like some help with this one.

 

[Art]

"Vertical :Foldover" can be caused by defective caps in the vertical
circuit, esr and change those that even look suspecious.
"Carl M. Pratt" <cpratt@maryland.net> wrote in message
news:ZPNXb.7$HQ5.69679@news.abs.net...

So Jamie, what are you saying? That something is shorting out the fly
back
or the fly back is shorted internally and needs replaced. I find nothing
shorting the fly back. and every thing else looks good and works good. I
can
adjust the focus and G2 but still have the vertical fold-back. also tried
to
replace the Vertical IC again in case it was damaged.


"Jamie" <jamie_5_not_valid_after_5_Please@charter.net> wrote in message
news:102u3674mcj8p64@corp.supernews.com...
almost sounds like your flyback is shorting out giving it alittle more
juice than it expects!
)


Carl M. Pratt wrote:

I have 1996 a zenith SY2568S I replaced the vertical deflection IC
TAD8174
with NTE 1858 replacement which is the same ST chip, after about a
year
old
after a lighting storm and I think one low Ohm resistor from the
flyback.
Checked the caps around it and it worked until just resently. It made
a
poping noise when turned on and the Vertical IC had a chunk blown out
of
it
just as it had the first time I replaced it 4 years ago replaced all
the
caps around it , checked resistors transistors diodes resoldered any
try
connections. Now the TV has widely spread vertical retrace lines that
fold
back to about the center of the screen and the folded back retrace
lines
are
mirrored at the bottem half of the CRT. Don't have a schematic and
would
like some help with this one.