we have an automatic tester in factory after SMD. And we set some test pads on PCB for some of voltages which include +1.05v_RUN.At the test beginning,the tester tests the resistance between those test pads and GND (without power). And it swaps the test pad by electric relays, and it measures the resistance by a multi-meter. After resistance testing, the tester power the board, and test the voltages.
And in our schematics, +1.05v_RUN net are directly connected to following parts:
TK1 VDDIO_SATA (AK30)
TK1 AVDD_SATA_PLL (AH31)
TK1 AVDD_PEX_PLL (AC21)
Anyway, i try to isolate those nets. finally i found the short pins are AVDDIO_PEX and DVDDIO_PEX on TK1. and then i removed TK1 from PCB board, and check the pins (solder balls) on TK1. And confirmed abnormal TK1 resistance on AVDDIO_PEX and DVDDIO_PEX pins.
So I would like to know:
- dose it real fail when the resistance about 40-60 ohm?
- if it is real failure, how can i avoid this?