StraightToThePoint
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820-00165
The Logic Board does not turn on, when attached to my power supply it will take 30Mah, then quickly 19Mah, then to about 160 for a split second, then back to 30. I have narrowed down the problem to U8080, and the PP5V_S4R3 rail. It seems like there is a short to ground, however I have checked every connection to this and there is no short. PP5V_S4R3 will go to 0V, then to about 2V for a split second (when it goes it 160 mAH). When I remove U8080, this goes away, and the board stays at 160mah, when removed I checked every connection and no short.
PM_SLP_S4_L will sometimes be there, it has occurred twice now where when I measure R8116, and others around it, the board will be OK, and even when U8080 is there the logic board goes to 160mAH.
I can compare the symptoms to Louis Rossmanns PM_SLP_S4_L video, where the S4 and S3 rails are affected by this.
I have replaced U8080 twice, and have replaced U1950 too.
EDIT: When removing U8080, PM_SLP_S4 is present and working. As well as PP5V_S4R3, and P5VS0_EN (However it is at 3V, is this normal?)
EDIT: Got it working, however not fully, PP5V_S4R3 is good, however U7820 is not outputting P1V8S3_PGOOD. All voltages are present too, PP3V3_S5 (3.3V), PP1V8_S3 (3V), P1V8S3_FB (0.8V) , P1V8S3_SW, (1.8V)
The Logic Board does not turn on, when attached to my power supply it will take 30Mah, then quickly 19Mah, then to about 160 for a split second, then back to 30. I have narrowed down the problem to U8080, and the PP5V_S4R3 rail. It seems like there is a short to ground, however I have checked every connection to this and there is no short. PP5V_S4R3 will go to 0V, then to about 2V for a split second (when it goes it 160 mAH). When I remove U8080, this goes away, and the board stays at 160mah, when removed I checked every connection and no short.
PM_SLP_S4_L will sometimes be there, it has occurred twice now where when I measure R8116, and others around it, the board will be OK, and even when U8080 is there the logic board goes to 160mAH.
I can compare the symptoms to Louis Rossmanns PM_SLP_S4_L video, where the S4 and S3 rails are affected by this.
I have replaced U8080 twice, and have replaced U1950 too.
EDIT: When removing U8080, PM_SLP_S4 is present and working. As well as PP5V_S4R3, and P5VS0_EN (However it is at 3V, is this normal?)
EDIT: Got it working, however not fully, PP5V_S4R3 is good, however U7820 is not outputting P1V8S3_PGOOD. All voltages are present too, PP3V3_S5 (3.3V), PP1V8_S3 (3V), P1V8S3_FB (0.8V) , P1V8S3_SW, (1.8V)
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