I'm trying to help the OP at the following thread:
I'm fairly certain that the problem is a shorted TVS diode, but I'm curious as to the identify of a 16-pin chip with the following markings:
6855A TI 271 A1CJIt is located just below the 4-pin jumper block, and at about 10 o'clock to the MCU (the largest IC).
I suspect that it was made by Texas Instruments, and that it may be a step-down PWM regulator with integrated MOSFET and diode.
A datasheet search at TI's web site found no items containing "6855".
The board appears to have 5 switchmode supplies (there are 5 inductors), with one being a -5V supply and the others probably being positive step-down regulators. One would provide +1.8V for the SDRAM and flash memory, while the others would provide the Vcore and Vio supplies for the MCU.
- Franc Zabkar