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Compal LA-4493P, LM393 pin 4 and 8 shorted

Troubleshooting Laptops & Notebooks - Badcaps Forums - www.badcaps.net
I hope someone here can offer me some guideline over the problems I urgently need to rectify.

Board is a Compal LA-4493P (KALG0+) from a Acer notebook.

The symptom started with when adapter plugin, mean supplying power to the circuit, i get PU4 (TPS51427) overheated and thermally shutdown. I don't have power LED light up too.

Further test reveal that a few power mosfet shorted. Change those. Yet I still have a shorted pin 4 & 8 on PU3 (LM393). According to datasheet pin 4 is ground. So I confirm that there are still some faulty components.

TPS51427 is not the fault, remove it from board still LM393 pin 4 & 8 shorted.

I also remove the LM393 from the board, the pin 4 & 8 on the circuit still shorted, so this LM393 isn't the fault.

Over at the schematic, LM393 pin 8 refers to VL. And basically my question is also this VL means where should I trace? Pin 8 has a PC11 smd cap connecting to ground. Tried remove the PC11 still same problem.
Date: Nov 4, 2013   


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