RichS
Registered
As some of you know, I am investigating a display problem on a System 4 Williams Flash. The "D" segmant was not lighting on Players 3 & 4. Swapping them around proved the displays were good. I did not have a schematic and there was not one for Flash on IPDB. Thank you to you all who pointed me to a "Blackout" that did have a schematic. Looking into it I discovered that "R11" (10K 1/2 watt) on the Master dispay was O/C. Hopefully I replaced it thinking it cannot be that simple, and it was not! It just started burning up again. So onward. Next in line is IC 10 (UDN7180A) the segment driver chip. I have now ordered one but refuse to buy the cheap Chinese "knock-offs that often dont work anyway so have ordered from the UK. My question Is , (and I appreciate how long is a peice of string?) But have any of you had experience of missing segments? Normally it is the display itself. Bearing in mind all the segments of all the othe rdisplays are good it is only "D" in 3 & 4 What is the likelyhood of the issue being further down the signal chain to the MC14543 Segment Latch Decoder/ Drivers or beyond. I know it is a long shot but I am sure someone on here has experienced problems of this kind and comments much appreciated.