Hello,
820-3435-A arrived with water damage. The water ingress indicator near J8300 is red. Two pins on J8300 corroded (disappeared) and I found some mild corrosion at Q7706 area. The latter was minimal and looks alright after cleaning with IPA. Two pins missing are pin 3 and 4. Both are PPHV pins feeding the backlight, so perhaps too much of a coincidence that these two are gone.
J8300 probably needs replacing but I am trying to establish if the rest of the board is ok before I embark on this journey.
I am not paying much attention to Q7706 area at the moment as I suppose it is mostly backlight related and we seem to be far away from turning on the backlight.
U5611 has some minor corrosion, pins, pads and solder look good.
Upon connecting to the power supply (no SSD, no wireless, no flex cable), the board switches 3 times between 450mA and 21mA and then settles around 520mA. Fan starts normally but ends up at full spin perhaps due to the flex cable being missing. CPU warms up slightly.
PLT_RESET_L is high at 3.3v
PPVCC_S0_CPU is at 1.3v (is this too low) ? This makes me think that the board reaches S0 state successfully.
There is no USB activity after 15-20s.
What would be your recommendation to check next trying to establish if any other issues exist other than the corroded screen connector?
Thanks
820-3435-A arrived with water damage. The water ingress indicator near J8300 is red. Two pins on J8300 corroded (disappeared) and I found some mild corrosion at Q7706 area. The latter was minimal and looks alright after cleaning with IPA. Two pins missing are pin 3 and 4. Both are PPHV pins feeding the backlight, so perhaps too much of a coincidence that these two are gone.
J8300 probably needs replacing but I am trying to establish if the rest of the board is ok before I embark on this journey.
I am not paying much attention to Q7706 area at the moment as I suppose it is mostly backlight related and we seem to be far away from turning on the backlight.
U5611 has some minor corrosion, pins, pads and solder look good.
Upon connecting to the power supply (no SSD, no wireless, no flex cable), the board switches 3 times between 450mA and 21mA and then settles around 520mA. Fan starts normally but ends up at full spin perhaps due to the flex cable being missing. CPU warms up slightly.
PLT_RESET_L is high at 3.3v
PPVCC_S0_CPU is at 1.3v (is this too low) ? This makes me think that the board reaches S0 state successfully.
There is no USB activity after 15-20s.
What would be your recommendation to check next trying to establish if any other issues exist other than the corroded screen connector?
Thanks
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