I'm working on a display monitor which is used in a wheel alignment machine in a garage. The unit is a type of VGA monitor which was manufactured by Kristel Corp. It has problems and I would like to see if I can substitute a standard VGA monitor in its place. It uses a special connector which according to the schematic has the following connections:
1- Red in 2- Red ground 3- Green in 4- Green ground 5- Blue in 6- Blue ground 7- Common ground, (common with video grounds) 8- H-sync in 9- V-sync in 10- NC There is a 75 ohm resistor from each color input to ground. All grounds are common. I found a pinout for a 15 pin VGA connector. It is marked: Standard VGA monitor pinout---------------------
1 Red Video 2 Green Video 3 Blue Video 4 Monitor ID - Bit 2 5 Ground 6 Red Ground 7 Green Ground 8 Blue Ground 9 [KEY] 10 Sync Ground 11 Monitor ID - Bit 1 12 Monitor ID - Bit 0 13 Horizontal Sync 14 Vertical Sync 15 N/C (Reserved)I would like to try to use a standard VCA monitor for this application. Can I use the substitute monitor by connecting its RGB inputs to the alignment machine electronics RGB connections, then tie all the grounds together, and then connect the h and V sync to their appropriate pins? Do I need to worry about the other connections? The OEM monitor doesn't seem to use any of them The following is what I have in mind:
Standard VGA Oem cable from from alignment machine monitor pinout
--------------------- ----------------------------
1 Red Video 1- Red out 2 Green Video 3- Green out 3 Blue Video 5- Blue out 4 Monitor ID - Bit 2 - N/C 5 Ground 7- Common ground 6 Red Ground 2- Red ground 7 Green Ground 4- Green ground 8 Blue Ground 6- Blue ground 9 [KEY] - N/C 10 Sync Ground - conn. all gnds together 11 Monitor ID - Bit 1 - N/C 12 Monitor ID - Bit 0 - N/C 13 Horizontal Sync 8- Hor. sync 14 Vertical Sync 9- Vert sync 15 N/C (Reserved) - N/CI'm not sure about the Hor sweep rate but I think that its compatible. Would an old type multisync monitor. (of the type that I scrapped years ago) have been a better choice for this conversion? I also have an old RGB monitor with separate BNC connectors on the back for RGB and V and H sync. Might that also work? If anyone has some further information on this I would be very grateful. Lenny