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Test pin of ST75400

Question asked by avilez.eduardo on Oct 31, 2012
Hi, I'm using the ST7540 for a little system of 2 computers, after two weeks I finally accomplished read, write, and send information. But suddenly, the PA (Power amplifier)  stop working, so, the control loops start to working and needs more and more voltage and current, I don't know how it damage, but The ST7540 Have two test pin and I want to test it, but there's no word in the datasheet   about how work those pins (27 and 28), can you explain me how?.

If there is a way to repair this PA, please tell me.

Thanks a lot. Greetings from Venezuela.