thebman80
Well-known member
I just get an Exidy Death Race PCB and I'm having trouble getting the picture to SYNC right. I can sometimes get a stable picture but there is always something wrong with it. I have tried using composite video to a TV and I have tried going through my monitor on my test bench.
Composite video on a small black and white TV I get this
On my test bench I get this
Now I read that trying to isolate the SYNC out of the video circuit can help and I found this in the original schematics. Problem is that the place where the SYNC is labeled in the schematics says it comes out of pin 10 of chip 15 A and that leg goes to a resistor R130 when I checked that pin just goes to nothing and none of the resistors or other parts on the PCB are silk screened with numbers. Only the primary chip locations seem to have any number and lettering system.
Schematic
Here is a picture of pin 10 chip 15A top and bottom nothing just a floating leg.
Any ideas as to how I can get this picture to SYNC up right? Also anyone have a schematic that has all the parts on the PCB labeled? It would save me the trouble of actually making one myself which I might.
Composite video on a small black and white TV I get this
On my test bench I get this
Now I read that trying to isolate the SYNC out of the video circuit can help and I found this in the original schematics. Problem is that the place where the SYNC is labeled in the schematics says it comes out of pin 10 of chip 15 A and that leg goes to a resistor R130 when I checked that pin just goes to nothing and none of the resistors or other parts on the PCB are silk screened with numbers. Only the primary chip locations seem to have any number and lettering system.
Schematic
Here is a picture of pin 10 chip 15A top and bottom nothing just a floating leg.
Any ideas as to how I can get this picture to SYNC up right? Also anyone have a schematic that has all the parts on the PCB labeled? It would save me the trouble of actually making one myself which I might.