Hi guys, I have a Mac air 1465 2015, fan spin but no image. After inspecting the main board, I found no corrosion even the test points are nice and shiny.The boards its so clean looks new. Anyways PPBUS_G3H is present 8.6V, PP3V42 is present 3.42V, the CPUVR is present 1.8V and the cpu gets warm, 3V present, 5V present. Since its start fine all the s5, s4,... must be present. I checked the s0 power rails at some points and they there.
I also programed the flash rom U6100 with few firmware I found on the web, but the same result. Checking with the thermal camera there are 2 heath spots more than the rest, nothing over the limit about 40 degrees , one is the U7400 that is a TPS51916 that is a ram powersuply. checking the voltage near the ram and there is the 1.3v. I also reflow all the chips, with no improvements.
The other chip that gets hot is the U3900 that is a BCM15700 IC, I think this is the camera memory ic. Now this hets warm but on one side only towards one edge.
So basically the laptop comes on, at start I get the green then orange light on the charger, the fan spins but normally not at full speed, the battery charges fine, the light get green after the batter is fully charged, and it can start from the battery as well. Apparently everything ok, but no chime or image.
I tried to reset the PRAM but it doesn't react. If I power it from the PSU 18.5V I see it takes about 0.441amp and if I connect the ssd goes to about 0.500 or something like this.
The only thing I see wrong on the visual inspection is the stud where the m2 drive should be screwed is been rip of the board, but I don't see major damage.
I'm starting to think that is a bad cpu. Any thought will be appreciated.
I also programed the flash rom U6100 with few firmware I found on the web, but the same result. Checking with the thermal camera there are 2 heath spots more than the rest, nothing over the limit about 40 degrees , one is the U7400 that is a TPS51916 that is a ram powersuply. checking the voltage near the ram and there is the 1.3v. I also reflow all the chips, with no improvements.
The other chip that gets hot is the U3900 that is a BCM15700 IC, I think this is the camera memory ic. Now this hets warm but on one side only towards one edge.
So basically the laptop comes on, at start I get the green then orange light on the charger, the fan spins but normally not at full speed, the battery charges fine, the light get green after the batter is fully charged, and it can start from the battery as well. Apparently everything ok, but no chime or image.
I tried to reset the PRAM but it doesn't react. If I power it from the PSU 18.5V I see it takes about 0.441amp and if I connect the ssd goes to about 0.500 or something like this.
The only thing I see wrong on the visual inspection is the stud where the m2 drive should be screwed is been rip of the board, but I don't see major damage.
I'm starting to think that is a bad cpu. Any thought will be appreciated.
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