Montgomery Ward 1987 13" color tv (bad horizontal )

[old_coot88]

This'n will be an interesting case study for sure. I never seen a bad yoke in a SS set before either (but plenty of tube type). If it ain't the yoke, what is causing the horz sweep to be "modulated" by the vert sawtooth?

If it turns out to be the yoke, it'll be the first (SS) one for me.

[zeno]

Originally Posted by old_coot88

This'n will be an interesting case study for sure. I never seen a bad yoke in a SS set before either (but plenty of tube type). If it ain't the yoke, what is causing the horz sweep to be "modulated" by the vert sawtooth?

If it turns out to be the yoke, it'll be the first (SS) one for me.

What I remember a FBT winding was in series with the SCR to turn it off.
The whole thing was timed at hoz rate. There was also a small IC that controled it. That needed a hoz pulse & ran on a FBT supplied B+.
RCA did a similar thing & when the main filter cap opened it looked
like a Christmas tree. Quite distinctive..
Lets have the model ## so I can pull the Sams

73 Zeno
LFOD !

[liammc00]

Originally Posted by zeno

What I remember a FBT winding was in series with the SCR to turn it off.
The whole thing was timed at hoz rate. There was also a small IC that controled it. That needed a hoz pulse & ran on a FBT supplied B+.
RCA did a similar thing & when the main filter cap opened it looked
like a Christmas tree. Quite distinctive..
Lets have the model ## so I can pull the Sams

73 Zeno
LFOD !

The model is JSJ12227

[zeno]

Not listed in Sams. If there is a Sams set in your area ( library etc. )
you can look for similar Sharps in that time frame. Bring the number
off the jungle & regulator IC's also the flyback ( rtrnf #### ) &
you will get very close.

73 Zeno
LFOD !

[liammc00]

You guys were right the yoke is bad. The yoke had shorted windings doto the varnish being bad. so I'm going to rob it for parts. Let it RIP.