My old HP8590a needed a new display. So I purchased a new in box unit marked as an OmniVision type. Same size, same connectors. However, it appears that the horizontal sync is not proper for the HP8590a. According to what I can find about these monitors, they handle a wide horizontal sweep frequency range. Adjustment of the horizontal sync control from end to end does not bring the display into alignment. Best I can get is a stable display but having what appears to be 5 images. I'll attach a screen shot here. Any ideas on this problem?
To use the OmniVision LP0615E3Y monitor in the HP8590A it's necessary to change the monitor's horizontal sync frequency:
- replace capacitor C11 (4700pf/100V) with a 4300pf/100V mylar (in my case, I added a cap in series to trim the value)
- you'll have to tweak the monitor's horizontal position and linearity and also the vertical position and linearity.
- you'll have to change the HP8590A's monitor Calibration values for both vertical and horizontal position (be sure to save the calibration data)
The capacitor change will bring the monitor's horizontal sync frequency sufficiently in range so that it will work properly with the HP8590A's horizontal sync pulse frequency.
I suppose some tweaking could have been accomplished to optimize the vertical linearity, but it was sufficiently adjustable that no hardware mods were needed.
A calibration test passed just fine.
Good luck!