THE COUNT
New member
On a Williams Dirty Harry, I have a lamp row that will not light. The row is J134-1.
- The TIP102 (actually it is a TIP122, I assume it and another one have been replaced with these) for this row, Q90, tests good according to the method suggested in the TOP repair guide (not having continuity with the ground strap in the backbox).
- There is continuity between the red/brown wires at the lamps and the header pin on the driver board, so the IDC isn't to blame.
- None of the associated lamps in this row light up when selected in the single lamp test.
Where should I go from here with this?
- The TIP102 (actually it is a TIP122, I assume it and another one have been replaced with these) for this row, Q90, tests good according to the method suggested in the TOP repair guide (not having continuity with the ground strap in the backbox).
- There is continuity between the red/brown wires at the lamps and the header pin on the driver board, so the IDC isn't to blame.
- None of the associated lamps in this row light up when selected in the single lamp test.
Where should I go from here with this?