TV Philips G112 chassis pincushion problem

[Freddy T]

I have a Philips TV , it's a G112 chassis with rather curved looking
vertical lines at each end, pincushion . So I though it was the E/W
circuitry, you know the vertical modulated onto the horizontal stuff. But
it all checks out okay. Can anyone kindy offer any help?

I think the model number is a 29sp1798


Thanks for any help in advance

Frredy T

 

[Jerry G.]

How did you determine that E/W circuitry is working correctly? If it is
working correctly the E/W pin should come in.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Freddy T" <still.workingOn@my.New.emailAddress> wrote in message
news:Xns943FD501AA2D5stillworkingOn@203.87.95.150...
I have a Philips TV , it's a G112 chassis with rather curved looking
vertical lines at each end, pincushion . So I though it was the E/W
circuitry, you know the vertical modulated onto the horizontal stuff. But
it all checks out okay. Can anyone kindy offer any help?

I think the model number is a 29sp1798


Thanks for any help in advance

Frredy T

 

[Freddy T]

I disconnected the main transistor in the E/W cctry and got a bowed in
picture with the deflection stopping along the edges of the bow. When I
restored the transistor I got a full screen but any vertical lines close to
any edge where bowed inwards, ( my original problem). I also tested both
transistors and measured all the components in the E/W circuitry,
includings caps for value and also ESR value on the electros.


Freddy t

How did you determine that E/W circuitry is working correctly? If it is
working correctly the E/W pin should come in.



Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Freddy T" <still.workingOn@my.New.emailAddress> wrote in message
news:Xns943FD501AA2D5stillworkingOn@203.87.95.150...
I have a Philips TV , it's a G112 chassis with rather curved looking
vertical lines at each end, pincushion . So I though it was the E/W
circuitry, you know the vertical modulated onto the horizontal stuff. But
it all checks out okay. Can anyone kindy offer any help?

I think the model number is a 29sp1798


Thanks for any help in advance

Frredy T

 

[mo]

Freddy T <still.workingOn@my.New.emailAddress> wrote in message news:<Xns9440DCDECD1BAstillworkingOn@203.87.95.150>...

I disconnected the main transistor in the E/W cctry and got a bowed in
picture with the deflection stopping along the edges of the bow. When I
restored the transistor I got a full screen but any vertical lines close to
any edge where bowed inwards, ( my original problem). I also tested both
transistors and measured all the components in the E/W circuitry,
includings caps for value and also ESR value on the electros.


Freddy

Try removing coil 5933

measure the resistance

should be about 5 Ohms (1 Ohm is short - Replace)

Good Luck,

--- mo ---

 

[Freddy T]

I disconnected the main transistor in the E/W cctry and got a bowed in
picture with the deflection stopping along the edges of the bow. When
I restored the transistor I got a full screen but any vertical lines
close to any edge where bowed inwards, ( my original problem). I also
tested both transistors and measured all the components in the E/W
circuitry, includings caps for value and also ESR value on the
electros.


Freddy




Try removing coil 5933

measure the resistance

should be about 5 Ohms (1 Ohm is short - Replace)

Good Luck,

--- mo ---

Thanks mo

Unfortunately I had taken that coil out and did a ring test and it came
up okay. But I took it out again after seeing your advice and blast it
measured 5 Ohms.

I may have to start removing more of those pesky surface mount
components in the E/W cctry. Arrgh what a pain.

I wonder if there is a fault elsewhere that can show up as an E/W
problem? I am not sure if I should continue working in the E/W area or
maybe look elsewhere?

Thanks for any help
Freddy T

 

[GPG]

Freddy T <still.workingOn@my.New.emailAddress> wrote in message news:<Xns9445D8C636D26stillworkingOn@203.87.95.150>...

I disconnected the main transistor in the E/W cctry and got a bowed in
picture with the deflection stopping along the edges of the bow. When
I restored the transistor I got a full screen but any vertical lines
close to any edge where bowed inwards, ( my original problem). I also
tested both transistors and measured all the components in the E/W
circuitry, includings caps for value and also ESR value on the
electros.

I wonder if there is a fault elsewhere that can show up as an E/W
problem? I am not sure if I should continue working in the E/W area or
maybe look elsewhere?

Thanks for any help
Freddy T

Is the bow the same with and without e/w? If so, missing sawtooth from vert o/p

 

[Freddy T]

Freddy T <still.workingOn@my.New.emailAddress> wrote in message
news:<Xns9445D8C636D26stillworkingOn@203.87.95.150>...

I disconnected the main transistor in the E/W cctry and got a bowed in
picture with the deflection stopping along the edges of the bow. When
I restored the transistor I got a full screen but any vertical lines
close to any edge where bowed inwards, ( my original problem). I also
tested both transistors and measured all the components in the E/W
circuitry, includings caps for value and also ESR value on the
electros.

I wonder if there is a fault elsewhere that can show up as an E/W
problem? I am not sure if I should continue working in the E/W area or
maybe look elsewhere?

Thanks for any help
Freddy T

Is the bow the same with and without e/w? If so, missing sawtooth from
vert o/p

Thanks GPG.


I ended up finding my problem. Leaky vertical caps had caused the vertical
feed to the E/W to go high. Some signal was getting thro but not much.
Replaced the vertical caps and fixed the connection to the E/W and all
works.


Thanks for everyones help.
Freddy T