How is a VGA monitor connection tracked?

Question

Iron

Hi all. There is an ancient thin client that is a pity to throw away. Depo Sky M50. It won't start without a monitor connected. If you connect a monitor via VGA, the download goes on (it loads debian 10 installed on the IDE DOM).
Tried a VGA terminator with alik - it doesn't roll) I tried 3 resistors of 75 ohms each from the color channels to the ground ... it doesn't roll. How else can motherboards track a VGA monitor connection and how can it be fooled?

Answer 1

connect the board from any monitor (even without power to it it should work) and that's it. Mute the line so to speak .. let him think that the monitor is there ..

Answer 2

Add two more 75 ohm resistors to Vsync and Hsync.
If the motherboard checks EDID, then you will have to hang a 24C02 chip with EDID on the connector pins. Cm.

VGA connector pinout.

This chip can be found on the main boards of faulty monitors / TVs with a VGA port, the chip must refer specifically to the VGA port.
Or write any EDID for a VGA monitor into the 24C02 programmer, for example.

hex

00FFFFFFFFFFFF00410C3AD040E20100
101101030E1E1778EAB4A5A1584E9726
165054BFEE0001010101010101010101
01010101010164190040410026301888
360030E410000018000000FF00545933
30373039313233343536000000FC0050
484C20313550464C34313232000000FD
00384C1E3F08000A20202020202000E3

Instead of a programmer, you can get by with a VGA / HDMI / DVI connector and Linux OS with i2c-tools programs, but not all video cards support i2c recording.

Answer 3

DDC.
You can try to put on the ground 4 and 11 pins in the connector.

Answer 4

Check if your client starts up with the monik connected, if the monik is not plugged in? If so, then there is a chance to get by with only resistors or a board torn from an old monitor, without power supply.