Hi all,
KDS AV-195TF Trinitron tube
I've not worked on one of these before but I have 2 with exactly the same
symptoms.
Perfect picture, nice 'snap' (arc), picture collapses but comes back perfect
except for center area now out of focus.
Asked a friend at another shop and he said that the KDS units have trouble
with marginal FBT's.
Opened her up to get the number off the FBT (HFL1127RD) and noticed it had 2
FOCUS pots.
Saw on Sam Goldwasser's faq that some new sets have a Horiz. and Vert.
focus. New to me.
But before I go off half-cocked I wanted to know if anyone has worked with
one of these units and what they thought.
What ARE exactly the 2 FOCUS controls and can an internally arc'ed FBT cause
this asymetric. The dynamic focus circuit?
Thanks for any help,
Keith

?test
"paul" wrote in message
ink.net...
Hi all,
KDS AV-195TF Trinitron tube
I've not worked on one of these before but I have 2 with exactly the same
symptoms.
Perfect picture, nice 'snap' (arc), picture collapses but comes back
perfect
except for center area now out of focus.
Asked a friend at another shop and he said that the KDS units have trouble
with marginal FBT's.
Opened her up to get the number off the FBT (HFL1127RD) and noticed it had
2
FOCUS pots.
Saw on Sam Goldwasser's faq that some new sets have a Horiz. and Vert.
focus. New to me.
But before I go off half-cocked I wanted to know if anyone has worked with
one of these units and what they thought.
What ARE exactly the 2 FOCUS controls and can an internally arc'ed FBT
cause
this asymetric. The dynamic focus circuit?
Thanks for any help,
Keith

Hello: I had the same problem on this monitor. Had to change 2 transistors
at the rear of the board centered. Cant remember the number C4??? but they
are to-220 mounted on a heatsink. You can follow the circuit from the
flyback pin labeled DF. Hope this helps.
"paul" wrote in message
ink.net...
Hi all,
KDS AV-195TF Trinitron tube
I've not worked on one of these before but I have 2 with exactly the same
symptoms.
Perfect picture, nice 'snap' (arc), picture collapses but comes back
perfect
except for center area now out of focus.
Asked a friend at another shop and he said that the KDS units have trouble
with marginal FBT's.
Opened her up to get the number off the FBT (HFL1127RD) and noticed it had
2
FOCUS pots.
Saw on Sam Goldwasser's faq that some new sets have a Horiz. and Vert.
focus. New to me.
But before I go off half-cocked I wanted to know if anyone has worked with
one of these units and what they thought.
What ARE exactly the 2 FOCUS controls and can an internally arc'ed FBT
cause
this asymetric. The dynamic focus circuit?
Thanks for any help,
Keith