IBM Monitor Shrink

[Neil]

My IBM Computer Monitor suddenly gets larger for a couple of seconds once
its warmed up. The picture also gets noticeably darker once it becomes
larger. Any ideas where to look first??.
Should I be spritzing coolant on the components once it heats up to find the
suspect component??
Thanks in advance,
Kim

 

[Turbo]

Sounds like your high voltage is going
too high, thus the "blooming", & larger
picture. Measure the high voltage with
a high voltage probe! Check the horizontal
drive, & high voltage capacitors in the flyback
transformer area! Turbo.

 

[James Sweet]

As illogical as it first sounds, higher HV will result in a *smaller*
picture, and low voltage will cause it to bloom and expand.

"Turbo" <Turbo@roadrunner.nf.net> wrote in message
news:bjgjm1$phv$1@nntp-stjh-01-01.rogers.nf.net...

Sounds like your high voltage is going
too high, thus the "blooming", & larger
picture. Measure the high voltage with
a high voltage probe! Check the horizontal
drive, & high voltage capacitors in the flyback
transformer area! Turbo.

 

[JM]

quoting:

A word of warning - be VERY CAREFUL when inside the case. These circuits
have very high voltages which could harm you.

My IBM Computer Monitor suddenly gets larger for a couple of seconds once
its warmed up. The picture also gets noticeably darker once it becomes
larger. Any ideas where to look first??.
Should I be spritzing coolant on the components once it heats up to find
the suspect component??

Check it out, might be recalled.

http://www.cpsc.gov/cpscpub/prerel/prhtml03/03176.html