i just got a 160 from another member here with similar screen issues, and the contrast would drift around as the screen warmed up.
I fixed it. works like a brand new screen too. There was a thread that i made a couple posts in about the same screen issues, and yellow corners, etc and i brought this up. but no one has tried or posted of trying of what i suggested. So i got a powerbook for myself, and tried it myself.
There is approximately a 40V or so supply that provides power to the STN grid itself. when the buffers/drivers scan the display, it sends AC current to each pixel twisting the crystal in one position or another, uses this supply as the B+ source for doing the "twisting"
problem is, this supply gets noisy and lowers in voltage, allowing the screen to do strange things. All the surface mount electrolytics were bad, just as the ones that plague compact macs. I replaced all of these and the screen worked like brand new.
I fixed it. works like a brand new screen too. There was a thread that i made a couple posts in about the same screen issues, and yellow corners, etc and i brought this up. but no one has tried or posted of trying of what i suggested. So i got a powerbook for myself, and tried it myself.
There is approximately a 40V or so supply that provides power to the STN grid itself. when the buffers/drivers scan the display, it sends AC current to each pixel twisting the crystal in one position or another, uses this supply as the B+ source for doing the "twisting"
problem is, this supply gets noisy and lowers in voltage, allowing the screen to do strange things. All the surface mount electrolytics were bad, just as the ones that plague compact macs. I replaced all of these and the screen worked like brand new.