On Jan 16, 8:57*pm, Fred wrote:
"PE" wrote:
Hi all: *My 15-yr old Toshiba 27" crt television has recently developed a
problem which is that approx 15 minutes after being turned on, the picture
bows inward on the left and right sides. *Then, after a few more minutes,
the picture resolves and returns to normal and remains perfect for the
remaining time the tv is on. *If the symptom described above means the crt
is wearing out, so be it, the set will soon be history. *However, I'm
wondering whether some other, replaceable part, might be going bad and
causing the temporarily distorted picture.

Would appreciate any suggestions re. probable cause(s) of symptom described
above. *Am basically novice, but handy and with soldering skills, and have
done a few simple tv repairs in the past. *Thanks for your replies!

See if the problem can be influenced by vibration. Smack the set on it's
side to see if you can influence it. If so turn the lights out and look
inside the vents. See if you can see small sparks that could be a bad
solder joint. Because *the problem comes and goes it may very well be a bad
solder joint or connection. Be safe. If you don't know of the dangers
involved then stay away from the repair.

Bowing in of the sides of the picture has nothing to do with the crt ,
it is the deflection yoke (coils) at the base of the tube that move
the beam from one side to the other and top to bottom. Have you
tried running the set with the back loose enough to greatly lower the
internal temperature, and see what effect that has.