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Hey everyone This device came in with the regular PP3V3R3V0_AON short to ground, I first suspected U7600 so I removed it but the short did not go away. After lifting up and soldering back 2 other chips (I think around U4450) I finally found the suspect on the other side of the board: U4700...

R7051/52 within specification? Is the battery detected by OSX? Does the system charge a battery? R5280/81 within specification? Resistance to ground on SMBUS_SMC_5_G3_SCL and SDA in Ohm?

R6905 can't be shorted, its supposed to be 1Ohm. (Its basically a cheap fuse and also part of an RC filter). I assume you meant broken? PPBUS_G3H stable or also pulsing? If so, is it hitting (or getting very close to) its expected voltage of 12.6V? PM_SLP_S4_L pulsing?

You need to have PP3V42_G3H before you can get SYS_ONEWIRE. U7000 is needed to get PP3V42_G3H though, as it needs to open the Q7080 gate. Resistance to ground in Ohm on PP3V42_G3H? R6905 OK? PPDCIN_G3H_OR_PBUS voltage? Looking good around U6990?

I had no idea these existed, I ordered one to check it out! Thanks

Hey everyone, I currently don't have any chargers I can cut the cord from to use on my bench power supply and cutting it off a fully working original would break my heart (and wallet). Would this be an 'acceptable' replacement: https://blog.adafruit.com/2017/08/03...nd-generation/ Just...

Actually if you have contacts in China (And I guess if you look really well) you can find trash boards of this model. I'm honestly considering opening an eBay store for these boards no one else out of China seems to offer

I'm almost done with my current queue and hope to investigate the IMON signal a bit more to see if at some point a big amount of current goes to ground. (Indicating a possible failure with one of the mosfets) No other updates so far though

Resistance in Ohm on the fuse? Should be 0, if it detects any kind of resistance more then just touching your probes together it's dead 0.8Ohm to ground on PPBUS is definitely a short by the way. Inject voltage and find the source of the short. Keep an eye on the temperature of the CPU because...

Impossible to get 8.58V at L7130 but simultaneously 0V on PPBUS_G3H. Are you sure the fuse is not blown or gone into high resistance?

99.9% of the cases this is the keyboard partially shorting the ONOFF signal to ground. I'd say it's probably hovering around 2.2 - 2.8v based on your description Unless the KB area on the motherboard looks ugly, just give a new KB a try

You can either replace the jack or remove L6607/L6608 (I'm not sure which one of the two, can't find a datasheet of the CS4208 either). Keep in mind that by removing the coil you will permanently remove S/PDIF functionality from the device

PPBUS_G3H would be the battery voltage when its the only power source connected, don't worry about it. 12.39V means the battery is holding a good amount of charge.

PP5V_S5 is a bit high, you sure you're measuring the right spot?

Most of the cheap ones are crap, you can be cheap if you just take a look at it and discard all those that are not fixable in 20 minutes

The replacement bios, did it come from another Macbook or was it a new one? If it's new, did you set the quad enable bit? See if replacing the clock chip U1900 resolves your issues.

Just to be clear, are you saying your 5V rail jumps between 3.7V and 37V? Resistance in Ohm between PPVIN_S5_HS_OTHER_ISNS and PP5V_S5?

82.5kOhm is alright, keep an eye on this voltage though as its one of the first signals we need for the system to do anything. Voltage of S5_PWRGD, PM_DSW_PWRGD, PM_SLP_S4_L, PP3V3_SUS?

186ohms to ground is alright, its probably not the issue. (We're looking at 0.003675W vs 0.005927W) You replaced the BIOS chip? Well now we have a whole different issue on our hands because you can't just swap them over like that! Please place back the original one When you made this topic...

Diode mode is a bad way for comparing the resistance to ground on low resistance lines like PP1V05_S0. (Its ok for finding power lines or shorts to inspect though, but when comparing boards do it in ohm). A semi-short can cause a quarter fan spin in rare situations. Anyways what is the...