1990 Zenith horizontal width is too wide

[Lee Haymond]

I own a Zenith model SS1913W (Made in 1990) with a slight problem: Th
horizontal width is too wide - cuts off lots of picture. No marke
pots to set it. I don't work on TVs, but it seemed it was somthing t
do with the flyback Xformer. How would one set it?
Thanks, Le

 

[Dave Plowman (News)]

I own a Zenith model SS1913W (Made in 1990) with a slight problem: The
horizontal width is too wide - cuts off lots of picture. No marked
pots to set it. I don't work on TVs, but it seemed it was somthing to
do with the flyback Xformer. How would one set it?

Called overscan. And probably as it left the factory.;-( If no pot there
could be a jumper or even an inductor. But be prepared for the geometry to
go out even if you can set the width correctly.

 

[Lee Haymond]

There's almost a dozen pots on the board, none are marked. Can't find
schematic, how would one determine what to do without one?
Thank

 

[Charles Schuler]

There's almost a dozen pots on the board, none are marked. Can't find a
schematic, how would one determine what to do without one?

You can experiment, but that would likely be very frustrating. Hope that
someone else posts with some hints.

 

[David Naylor]

I own a Zenith model SS1913W (Made in 1990) with a slight problem: The
horizontal width is too wide - cuts off lots of picture. No marked
pots to set it. I don't work on TVs, but it seemed it was somthing to
do with the flyback Xformer. How would one set it?
Thanks, Lee

with the age of that set is is most definatly drifting caps look around
the fly area for puffy caps that set has seen its days cheaper to by new

 

[James Sweet]

You can experiment, but that would likely be very frustrating. Hope that
someone else posts with some hints.

Don't even think of touching the pots! Modern TV sets don't just go out
of adjustment, there's obviously a fault and if you start messing with
the pots, no tech will be willing to touch the thing.

 

[Dave Plowman (News)]

Don't even think of touching the pots! Modern TV sets don't just go out
of adjustment, there's obviously a fault and if you start messing with
the pots, no tech will be willing to touch the thing.

Reminds me of that old story about a valve radio brought in for repair -
the customer says it worked fine until he hoovered out the dust and
tightened up all the loose screws.

 

[Lee Haymond]

with the age of that set is is most definatly drifting caps loo
around
the fly area for puffy caps that set has seen its days cheaper t
by new

Nothing seemed puffy. It seemed to make no noticeable difference whe
I swapped out 2 mylar caps, 1 between the H drive transistor's C & B,
between it's B & E. The E is connected to the heat sink & what looke
generally like ground, C to the flyback x-fmr through a ferrite bead
the B to a small x-fmr, I'm guessing for drive step-up. I don't have
schematic, anyone got one? Am I looking at the right caps