2 or 3 year old 32inch sharp flat screen crt set . it turns on , screen
is dark . When i turn it off i see a white flash at the top of the
screen It repeats this each time i turn it on & back off . Turning the
screen up on the flyback does not bring up a screen .

Ken:
I sounds like you may have a problem in the vertical sweep circuit
causing the picture to be drawn as one line way up at the top
of the picture tube. The protection circuit may be active and killing
the power or video.
Try connecting one of the video cathodes (red, green or blue) at
the back of the picture tube socket to ground THROUGH a 1K
resistor. This should cause the screen to turn on with the selected
color.
Also check the G1 pin (pin 1) at the socket. If it is way negative
(over -100 volts), it may be cutting off the picture.
Also check the voltage on the G2 screen pin.
Note, this checks may not work if the set is loosing power
when it is turned on.

Hope this helps...
John


Ken G. wrote:
2 or 3 year old 32inch sharp flat screen crt set . it turns on , screen
is dark . When i turn it off i see a white flash at the top of the
screen It repeats this each time i turn it on & back off . Turning the
screen up on the flyback does not bring up a screen .