Solenoid driver board problem

[paddythegreek]

Decided to repair a few boards. I got a bally solenoid driver board that had half a dozen TIP 102's missing. Replaced them and checked they were the right way round. Install it in the machine, switch on and its like a few solenoids all energise together which takes out the 1a fuse under the playfield.
Could it be one of the 3 3081 chips or is it the large decoder one 74LS154 faulty causing this to happen or something else.

 

[pinballmania]

The 3081 is the most sensitive to damage. But run some tests. Disconnect all the solenoid outputs, replace the fuse, then test each output separately by briefly offering up a single solenoid connection to each pin in turn. Note any pins that energise the solenoid. Then refer to the schematic to see if the stuck on solenoids have commonality.

 

[paddythegreek]

Sorted thanks. It was a faulty U3 3081.