Focus after replacing Flyback Trans. JVC

Guest
I replaced the flyback tranformer on my 32" JVC, now I can's seem to
get the sides and the center focused at the same time. I can get one or
the other. Is there a trick to this??

Thanks
Chad
 
Model is ????
Flyback is Generic or ?
Tell us more.

kip
<boese.c@maplan.com> wrote in message
news:1121791954.961994.269830@z14g2000cwz.googlegroups.com...
I replaced the flyback tranformer on my 32" JVC, now I can's seem to
get the sides and the center focused at the same time. I can get one or
the other. Is there a trick to this??

Thanks
Chad
Click to expand...
 
It is model AV-32F703. I am not sure if the tranformer I bought is
generic or not, here is a link to the part I bought.
http://www.partstore.com/ProductDetail.aspx?ProductSKU=5176222&ProductType=PART


Thanks
Chad
 
Was it the QQH number or the other number. ?
QQH is the real thing ...
kip
<boese.c@maplan.com> wrote in message
news:1121795715.784166.7430@g14g2000cwa.googlegroups.com...
It is model AV-32F703. I am not sure if the tranformer I bought is
generic or not, here is a link to the part I bought.
http://www.partstore.com/ProductDetail.aspx?ProductSKU=5176222&ProductType=PART


Thanks
Chad
Click to expand...
 
On 19 Jul 2005 09:52:35 -0700, boese.c@maplan.com wrote:

I replaced the flyback tranformer on my 32" JVC, now I can's seem to
get the sides and the center focused at the same time. I can get one or
the other. Is there a trick to this??

Thanks
Chad
Click to expand...
Are there two focus controls? If so, one of the will affect the sides
more than the other. It's also possible that the old flyback damaged
the dynamic focus circuit when it failed.
Andy Cuffe

baltimora@psu.edu <-- Use this address until 12/31/2005

acuffe@gmail.com <-- Use this address after 12/31/2005
 
2 Focus knobs and a Screen control for a 32inch ???

kip
<boese.c@maplan.com> wrote in message
news:1121804450.266014.278700@g14g2000cwa.googlegroups.com...
There are 2 focus knobs.
Click to expand...
 
On Tue, 19 Jul 2005 16:43:43 -0400, "kip" <nospam@nospam.com> wrote:

2 Focus knobs and a Screen control for a 32inch ???

kip
Click to expand...
Apprently you have missed rare few old RCA TVs that had 2 H & V focus
pots along with one screen. Even RCA does sell newer TVs with this
but it is often found in high end type.

JVC using them, Samsung does. Not just in monitors. Gives best
overall focus. Some do have dynamic focus circuits as well which
actively corrects for the focus error.

Cheers, Wizard
 
Yes I have seen a few of the older RCA,s with that added focus block (2
Focus)
and even Mits and like you say high end sets but to date I have not seen
a JVC 32 with it.
Just making sure he has the 2 Focus Pots and Screen as well...

kip

"Jason D." <jpero@sympatico.ca> wrote in message
news:42dd7113.1892156@news1.on.sympatico.ca...
On Tue, 19 Jul 2005 16:43:43 -0400, "kip" <nospam@nospam.com> wrote:

2 Focus knobs and a Screen control for a 32inch ???

kip

Apprently you have missed rare few old RCA TVs that had 2 H & V focus
pots along with one screen. Even RCA does sell newer TVs with this
but it is often found in high end type.

JVC using them, Samsung does. Not just in monitors. Gives best
overall focus. Some do have dynamic focus circuits as well which
actively corrects for the focus error.

Cheers, Wizard
Click to expand...
 
In article <1121791954.961994.269830@z14g2000cwz.googlegroups.com>,
boese.c@maplan.com says...
I replaced the flyback tranformer on my 32" JVC, now I can's seem to
get the sides and the center focused at the same time. I can get one or
the other. Is there a trick to this??
Click to expand...
Dynamic focus? (that extra ring of wire you thought didn't do
anything and its associated circuitry)
 
On 19 Jul 2005 14:58:00 -0700, boese.c@maplan.com wrote:

So what should I try to fix this issue?
Click to expand...

I'm sure there is an official procedure, but this always works for me.

First, figure out which control is which. One will appear affect the
overall focus. This is the vertical focus control.

The other will mostly affect the width of vertical lines and has the
most effect at the left and right edges of the screen. This is the
horizontal focus.

Start with both controls near the middle of their range. You need to
display something with sharp vertical lines at the edges and sharp
horizontal lines in the center (a cross hatch is best).

First, adjust the horizontal focus for the sharpest vertical lines at
the edges. Ignore the thickness of the scan lines for now, just make
the vertical lines are as thin as possible.

Next, adjust the vertical focus for the thinnest horizontal scan lines
in the dead center of the screen. Alternate between the two several
times because they interact with each other heavily.

If you don't have any way to display a cross hatch, you can use a
computer if it has a TV output, or even the on screen menus of a VCR.
Andy Cuffe

baltimora@psu.edu <-- Use this address until 12/31/2005

acuffe@gmail.com <-- Use this address after 12/31/2005
 
The old Zeniths with dual focus had a procedure of putting a crosshatch
pattern on the screen, adjust one focus for the thinnest vertical ine,
the other for the thinnest horiz line. This works for me on all dual
focus sets. Once you have a crosshatch pattern on the screen it is easy
to see which control effects horiz and which effects vertical. From
there you have to go back and forth between the two a few times to
eventually get both at optimum. I don't like um, but part of the
business.
 
Here is another thing, the tranformer has a black and red wire coming
off it that connects to the board off the CRT, it is labled A and B - I
did not see how those came off. I put them back as Black -A and Red B,
would this effect anything?
 
Oh Boy !!!
<boese.c@maplan.com> wrote in message
news:1121872141.427940.34610@o13g2000cwo.googlegroups.com...
Here is another thing, the tranformer has a black and red wire coming
off it that connects to the board off the CRT, it is labled A and B - I
did not see how those came off. I put them back as Black -A and Red B,
would this effect anything?
Click to expand...
 
Duh ! Obviously... yes.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


<boese.c@maplan.com> wrote in message
news:1121872141.427940.34610@o13g2000cwo.googlegroups.com...
Here is another thing, the tranformer has a black and red wire coming
off it that connects to the board off the CRT, it is labled A and B - I
did not see how those came off. I put them back as Black -A and Red B,
would this effect anything?
Click to expand...
 
So does anyone know if the red is A and the Black is B, or just the
opposite?
 
You must log in or register to reply here.

Welcome to EDABoard.com

Sponsor

Back
Top