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Weird, mine JUST did this a few weeks back after being on route. Driver transistor 2 was shorted out.
I would check for shorts at the transistors. Mine was transistor 2. Board repair shop thought (before it was sent in) that switch row #1 logic was blown. May not be the same solution, but we had the same problem.
Also check for any shorts under the pf that could cause the board to fail.
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