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MacBook starts, fan spin, no chime, no backlight, no light on optical mouse. No liquid damage, all voltages present, PPBUS_G3H = 12,58v VCORE = 3x 1,7v SYS_PWROK present, PM_S0_PGOOD present, No short between VCORE and PPBUS_G3H. All suggestions (except dead CPU) are welcome :)

Ok, I've sent it back. Thanks guys.

Although the area looks a bit messed up, these resistors and XW's measure fine. I'm thinking there might be another input on u7800 causing this behaviour, but there's a confusing amount of inputs on this chip. Any ideas?

Charger switches to 20v. No PP1V8_SUS, not a short. PP3V3_S5, PM_SLP_SUS_L and PP5V_PMICLDO are all there, but no output on L8020. Has significant water/beer damage near PP1V8 feedback resistor area. All of this was restored. Working from a 820-00239 schematic and 820-00281, they seem close...

Hmmm, customer wasn't patient enough for this. Board returned. Thanks for your help anyway.

Yes, the machine is fine otherwise. Anyway, the way to go is get one from a donor board?

It didn't work before and I've replaced ISL95530 with one I've ordered on AliExpress. It works nog, but it won't charge the battery. Afterwards I saw the videos where Louis explains about these chips not working. So would this need a proper ISL95530 replacement or could there be other things...

Got tired of this one, made it a donor board :) Thanks Duke!

As you said, this would have shown up in ASD. When testing, ASD lowers the fan speed, suggesting the fans and fan controllers are fine. Also, the clock speed is lowered, indicating a sensor issue I suppose. I still kind of suspect the EFI. Some help would be appreciated. * I've dumped a working...

Replaced ISL6259, fans still running on high speed.

No improvement. Also, the ambient light sensor is working fine. What temperature sensor are you talking about Duke? All temperature sensor readings look fine in ASD. The following sensor reading are off, but don't give an ASD-error: IC0C = 0 (should be between 1 and 44) ID0R = 0.037 (should be...

Nope, no improvement with another dump. I must be something related to the 12V being put on the 5V rail, that ASD is not picking up on.

Thanks Duke, will do. Fans rev up after a few seconds. I think I have another one of these board so I'll try dumping that tomorrow.

Because the original BIOS was beyond repair, I replaced it with one from the Ghostlyhaks repository (with new ME, cleaned $SVS and replaced serial). I know some of these are faulty, but I don't have any alternatives at the moment. Come to think of it, the fan issue appeared after the BIOS flash...

Hi, I've got a 2012 a1286 here. Fans going full speed and clock speed is low, but EFI ASD doesn't find any errors. Known history: 1) BIOS was corrupted --> reflashed 2) Accidentally bridged C8900 and C8901 during reflow of U8900 putting 12V (PPVIN_S0_GFXIMVP) on the 5V rail...

You are going to need parts. I would start with measuring resistance to ground on PPVRTC_G3H and check the clock chip area and U5110 area.

Have you tried running ASD?

There's a limit to what I would do to my customer's boards Duke :) Anyway, it's on its way back.

It turns out PP3V3_SUS was shorted inside the board (near the BIOS). The board bulged slightly there and on the other side are some PPBUS_S5_HS_OTHER5V caps. I think a short in that line caused the bulging and the shorting of the SUS rail. Anyway, thanks again Duke!

Visual: clean board, no liquid damage. 2 exploded caps on PPBUS_S5_HS_OTHER5V (C7570 & C7541), replaced. S5 rails present, but no PP3V3_SUS. PM_DSW_PWRGD 3.4 PM_SLP_SUS_L 0 SMC_ADAPTER_EN 3.4 PM_BATLOW_L 0 PPVRTC 3.4 PM_SLP_S5_L 3.3...