Forget the exact model number, it was a 14" set mfd around Dec. '86. This
was the first such model I've worked on, and this one had a bad flyback.
Once the replacement was installed, the set ran but had a strange bluish
haze (with retrace lines) only in the center of the screen. After ruling out
any shorts in the CRT or supply voltage problems (cathode supply etc) I
noted that the original flyback had a strange feature - the focus and screen
wires were integrated into one coax-like cable. The focus was in the center,
and the screen was on the shielding. Wondering if this had something to do
with it, I took a long piece of thin wire and wrapped it around the full
length of the new focus and screen wires (together) and connected this wire
to the CRT ground. Success!
Anyone care to explain what was going on here? I've never seen anything
like it before......