“A TV came in, and I diagnosed it as a bad high-voltage module,” says fish. “I grabbed the only one we had in stock and replaced the bad module with it.
“The TV didn’t work — it had exactly the same problem.”
Did I get the diagnosis wrong? fish wonders. But after troubleshooting for other problems, he can’t find any.
So he orders a new module, plus a second one to keep in stock. When they arrive, he installs the new module in the TV. The TV still won’t work. He tries the second module — and the TV still won’t work.
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