Hello guys, it's my first time having problems with lamps row/line.

On my demolition man the highlighted lamps (in the attached picture) aren't working..
it seems to be clearly a problem with the entire 3rd row and part of the 8th line too.

I have tried changing the diode of the 85 lamp socket (right loop arrow) since it seemed badly colored (see pictures below)and the problem could start from there, but nothing changed..

Any advice on where to look? There is a simple way to test the transistors using a DMM?

Thank you in advance!!

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You mean cracked solder joints?? But why that column is only half off?

I Have solved the column problem! The fact that half column worked(the cabinet part) made me suspect of the linking playfield connector! And it was! Simply changing j137 with j138 solved it. Now the column is working except for lamp 83 in the intersection with the non working row checked the red-orange row cable and there is continuity from the backbox to all the lamps under the playfield..changing the j133-j134-j135 doesn't solve anything main suspect is the tip 107 transistor at this point..

Little update! I have found the time to take out the power board and test the tip102.. it seems to have normal values according to the others and to what pinwiki says also there is continuity between the transistor and the j- 133/134/135 pin 4! Where the problem could be? is it possible that it tests good but it's faulty?

Hello to everyone after a long time I'm up again on this never solved problem. I've tested the pinball with another working power board and all the lights works without problem, so the issue must be board related.

I choose to go with a shotgun replacement of the IC involved, since I had already replaced the TIP102 (Q88), so i replaced and socketed U12 and U16. Unfortunately it didn't helped. Still the row remains shut off..

There is less remaining on the Q88 circuit, resistances only..
Anyone can help me understand what else could I do?

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I have logic probe but just don't know how to use it

That's why I choose to simply replace the IC with a new couple..strange that it doesn't work yet..