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So we do seem to have data being shifted through.
Checked U103 (Parallel → serial shift register)'s SH and CLK lines (1, 2) and data out (7) and there is very little activity on it- but there is some:
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Checked U116 pin 12 (_ENABLE_) and it has a pulse train:
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Checked Q103..Q107 (display select line drivers) and there appears to be no data on the bases of those transistors