General Category > Lisa Troubleshooting and Repair

DataPower 1.8A PSUs: SG3524 regulator IC failing

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nekonoko:

--- Quote from: jamesdenton on October 21, 2023, 09:35:28 am ---I checked out those threads and couldn't find any definitive symptoms that might point someone to that regulator.
--- End quote ---

In my case the power light would come on when the switch was pressed, and the Lisa's speaker made a crackling, almost electric noise (similar to a Tesla coil) before shutting off. I found it described as a "machine gun" noise from the speaker in another thread suggesting replacement of the SG3524, and it seemed similar enough to give it a try (and it wound up fixing it). The replacement SG3524 I used was made by TI.

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