Good day everyone. I have an Acer One 14 (Z1401-C9JN) with board model NCBT411 ver 2.0, that's missing 3.3va. It has a 5v to 3.3v converter which is supplied by 5va.
As you can see in the image, 5va is present on red circle c171, c197 and c164. But no output on L7 coil. Found out that output rail is shorted to ground. I removed c179, c199 and c169 cirlced in yellow but short still remain. components circled in light blue is not present (na). It's still shorted even after I removed ic u7.
Does that mean I need to check all components that is supplied by 3.3va to find short? For the start I removed ic u20. Short still there.
I have attached schematic here. Hope to hear some advice. Thanks
As you can see in the image, 5va is present on red circle c171, c197 and c164. But no output on L7 coil. Found out that output rail is shorted to ground. I removed c179, c199 and c169 cirlced in yellow but short still remain. components circled in light blue is not present (na). It's still shorted even after I removed ic u7.
Does that mean I need to check all components that is supplied by 3.3va to find short? For the start I removed ic u20. Short still there.
I have attached schematic here. Hope to hear some advice. Thanks
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