Stern Southpark issue

[Simon barker]

Hi all.just got a South Park pin,very nice cond ,noticed controlled lamps were not working.found f22 blown.replaced now some work but in test column 5 out,row 4 ,row 9 and row 10.all flash lamps and coils OK,game plays ,no burnt or damaged connectors,I was assuming transistors but I doubt 3 would go down.it also says for column 5 is u13.the rows mentioned areQ36, Q41 and Q42.any ideas please,I want to get stuck in,thanks all.I will add all controlled lamps have recently been changed to led.not by me.

 

[drhex]

Hi Simon,
Do you have corrosion on the PDB? Full columns and rows usually are databus problems.

 

[Simon barker]

Thanks for reply,now sorted.after much testing it was the short ribbon cable joining the 2 boards.just needed reseating.

 

[drhex]

Yes, that can be dodgy, especially if there is corrosion.