IGS PGM MOTHERBOARD HELP

[kingau]

HI every one , I have a Igs pgm motherboard that I just got today.

and when I plug it in... it works but there is no red, and all I get is a blue tint.

I looked over the board and I can't find what is wrong?

thanks in advance

 

[kaicer]

if you got no red check the contact on the jamma assign to red, if the contact is ok then start tracing back, to eliminate possibilities of a broken trace.

 

[kingau]

the jamma is fine, going to look over the board again.

thanks

 

[kingau]

just look at the board, tested it and all seams fine. just no red signal

 

[Asayuki]

Just as green and blue, it shall come from some sort of a DAC. Usually a set of resistors, all different in value. Maybe there's a buffer transistor around (not sure). If the resistors are fine and well soldered, then look around for a latch driving them. 9 out of 10 the problem will be in that area. Having a scope would help you a great deal.

 

[kingau]

thanks for the help Asayuki !!

I started looking around and there is a long black resistor closet to pin 12 on the jamma part side .. that was not working right.


I notice how the color would come back .. so I solder pin 2 and 3 from the right to left .



thanks again Asayuki

 

[Asayuki]

I'm glad that helped! Ready for level 2?