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This board works fully (in limp mode / 800MHz) when the battery is disconnected. When the battery is connected it chimes repeatedly, so at the end of the chime, it chimes again. A different battery produces the same result. Replaced ISL6259, didn't help. Any thoughts? Could this be GPU related?
Things tried so far:
* Boot with wired connection
* Boot with touchbar, touchID and screen disconnected
* Full reinstall
Will boot into safe mode. Had some corrosion on the touchbar side of the logic board.
- No liquid damage
- Fixed short on PP3V3S5 FET.
- PPVIN = 20v
- Several short (?0.1 ohm) on U7800 (PMIC) rails
Lifted coils for the last 2 and both have the short on the load side a.k.a. CPU/PCH. Of course, the CPU could be shorted. Would it also...
Received this one pre-cleaned by another company and it actually worked when I got it. After doing some touch up work, returned it to the customer. It didn't work when the customer tested it and now that I've got it back, is doesn't work either. The fan spins, but I get no chime...
Fixed U8900 on this one. Ran Heaven to test, but this crashes and OSx returns to lockscreen shortly after. The fans run high after a while (without running Heaven), with low temperatures in iStats. ASD doesn't work, not sure why: 1) EFI version claims I'm using the wrong version (3S150) 2)...
So I've been reading about the shutdown problems of the 2013-2014 models. 3 possible solutions are suggested by the internet:
1) Removing the kext responsible for ethernet over thunderbolt
2) Using the nocrashmbp utility made by RealMacMods
3) Replacing the VCORE driver FDMF6808 for a 6708...
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
No short between VCORE and PPBUS_G3H.
All suggestions (except dead CPU) are welcome :)
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...
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...
I've got a 2012 a1286 here. Fans going full speed and clock speed is low, but EFI ASD doesn't find any errors.
1) BIOS was corrupted --> reflashed
2) Accidentally bridged C8900 and C8901 during reflow of U8900 putting 12V (PPVIN_S0_GFXIMVP) on the 5V rail...
What seemed like a simple repair just became a major frustration: one of the memory retention clips broke off. The upper memory slot now won't hold it's memory in place. Any suggestions on how to properly repair this?
History: Likely water damage, but cleaned before repair :(
Any suggestions on finding the short? Power supply maxed out at 0.1V/3.5A.
Tried 3 AA bateries in series supplying ±6A (voltage assumed 4.5V). But nothing gets hot except the batteries :)
Just ordered a few a1502 screens. After installing, the brightness control does not work and it always needs a sleep cycle to fix this after boot. Is this common in replacement screens and how do I prevent this?
After replacing the screen assembly of this laptop, the brightness control won't work. The screen works fine otherwise and brightness can be controlled on an mid2014 model with this same screen.
Edid issue maybe?