This is a ventilator.It is no longer used on patients.I usually use it to learn and practice the operation of the ventilator.
Due to the long time,Aging of the digital luminous film of the main display.I unpacked it,Found that there are 5 HV6506PJ drivers,
I guess 4 HV6506PJs should be used for the step display, and 1 HV6506PJ should be used for the 2 8-bit digital tubes in the center.
https://www.scribd.com/document/249426163/Manual-e100m-Serman-Rev-d-2202104 pages
I hope to fix it cheaply.The original factory has stopped after-sales maintenance.
My plan is to use ordinary LEDs (chips) to replace each film, then make a PCB, install the LEDs on the PCB, and use them to replace the original display. The center will use the most easily available 8-bit digital tube to replace the original display.
I don't know if my idea is feasible.
If you have a better idea, I look forward to your help, thank you