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Now the board is randomly working again... All I did was measure PM_SLP_S4_L resistance in a few different locations to try to confirm it was actually short. At first they all were, then suddenly they were not. Now the fan spins... Any idea how this happened? I hate boards that fix...

PM_SLP_S4_L is only 11ohm. I suppose that's my problem.

This is the first board I have encountered that has bad PM_SLP_S4_L but still has good PM_SLP_S3_L and PM_SLP_S0_L. Not sure what to make of it. No S3 rails are up and most S0 rails are down except PP3V3_S0 is good. Liquid damage. Mostly around SMC. Already lifted SMC. Nothing under the...

Liquid got spilled into the hinge and now it has no back light. Already confirmed that it's a screen problem, main board is fine. I was hoping to find some corrosion on the the little display controller board, but it looks clean. Connectors look good. The two little back light cables look...

Thanks for the reply. The short is actually gone now and board is currently working again. Yesterday I had confirmed with two different meters that it was short at around 1 ohm. Then I attempted to use DC power supply to heat up the short. I limited it to around 1.5A touched the short...

It looks like I have a new problem now. SMC_RESET_L is non existent and PP3v42_G3H is short to ground at 1 ohm. I won't have access to my DC power supply or hot air until later today, but noticed that with Magsafe connected that U7090 gets kind of hot, but not extremely. Hot enough to...

This thing is still giving trouble. I did a reball on SMC and the job went very smoothly. I tested it over the weekend by powering it up and down at least 10 times. Now today it's back to no green light. Is it worth trying to source a new SMC or is there something else going on?

This board looks very clean except for one tiny dot of liquid on top of SMC. Nothing around it or anywhere else on the board. PPBUS_G3H is only 12.29v PP3v42_G3H = 3.4v SMC_RST_L= 3.4v SMC_BC_ACOK = 3.37v SMC_BC_ACOK_VCC = 3.38v SYS_ONEWIRE = 3.38v ADAPTER_SENSE = 3.4v It looks like green...

I just pushed on the opposite side of the board from SMC and it made green light come on. Still no fan. Must be ball under SMC right?

This thing worked for a few days then quit. I reflowed SMC and it worked for a few more days but now quit again. Back to the same problem. R5100 now measures low and SMC reset is 0.7v. I can still bridge R5100 and make fan start. I suspect it needs new SMC although there was never any...

It was R5100. Replaced it and it measures 100k even while in circuit. (y)

J6100 looks good. I removed U5110. SMC_RESET_L is still low, but for some reason green light comes on now. No orange light with battery connected though and no fan. I also removed R7100 but SMC_RESET_L is still low, but it's higher than before. It was around 1.15v but now around 1.6v...

Dead. No LED and no fan. No obvious liquid. SMC area looks good. U5110 looks good. U7100 area looks good. PPBUS_G3H is only 8.18v SMC_RESET_L is always 1.15v If I jump R5100 with tweezers the fan starts and green light comes on. Measuring R5100 I am only getting 80k instead of 100k. But...

I still have this thing laying around if you are willing to try to clean BIOS. https://drive.google.com/file/d/1MKNnlvZOlQ5pyhP2dimIloq0Yj4whp6g/view?usp=sharing Yes, U8210 is giving the correct outputs.

I reflowed it and it seems to have fixed the bad USB port. I wanted to test the machine with my USB test disk, but I can't get the boot menu to appear by holding the "options" button. Immediately when the machine turns on the Apple logo appears and it boots customers SSD. Tried PRAM reset...

Here are the results. All four chips have the same diode mode measurement for the LDO rails. All voltages are present. It seems PP1v1_UPC_XB_LDO_BMC only comes up on the chip that the USB cable is plugged into. If I move the cable to all four ports, I can find this voltage only on three of...

It looks like all four CD3215 have the same diode mode reading for "USBC_XA_CC1" and "USBC_XA_CC2" Around 0.588 Are there any other lines that need to be compared?

Sorry, I don't know where the board number is on this one... Complaint was USB port problems and high fan speed. I have yet to hear the fans spin fast though. Water damaged. Someone has attempted to clean the board so corrosion is hard to find, but it's obvious water did hit near one of the...

Unfortunately I don't.

Any other idea?