On Wed, 19 Oct 2005 12:57:23 -0700, "Don" wrote:

Hi,

This is a Vison F153 flat panel monitor (1024x768?)

When power is first applied (with a valid signal source), the screen
"flashes" momentarily (i.e. to *normal* intensity) and then goes
dark. During this flash, it is obvious that the correct image is displayed
on the screen.

After the screen goes dark, it is still aparent that the display is
accurately
displaying the signal provided (e.g. you can see the ghost of the mouse
cursor moving around in response to mouse actions; you can double click on
icons and see those applications open, etc) -- but obviously the backlight
is no longer on (at all!)

There are two flourescent tubes in the display (?). Both are behaving
identically.

Each tube is excited from it's own inverter (i.e. the inverter board appears
to have two identical circuits on it).

So, it seems logical to assume that the supply to the inverters is a likely
suspect. Or, some control signal shared by both inverters (?).

Any suggestions as to where to start? I'd prefer *not* probing the
output of the inverters (for obvious reasons) and suspect that
would reveal very little that I can't already surmise...

Thanks!

[email address is bogus]


Double check that all the tubes are lighting. Even though it appears
to be normal brightness, one of the back light inverters might not be
working (there may be two tubes at each end). Suspect any
electrolytic caps on the board since they tend to run hot.
Andy Cuffe

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