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I've got an A1502 (820-3476) that had some liquid damage around the top edge of the board. After ultrasonic cleaning and replacing the ISL6259 PPBUS was restored (12.57V). With several known good 85W real MagSafe Adapters and DC-In boards the board only gets a green light that does not change...
Oddly, I used to have PP3v3_S5, but no longer. It's at 0.057v, though I still have PP5v_S5. Already replaced the SMC. The JTag has already been removed, and U1900 already replaced with new one. U1950 seems to be alright, no damage near it, and no shorts. SPI resistor traces are good. Traces near...
All PM_SLP_(S5, S4, S3, S0)_L are missing. PPBUS_G3H is 8.61v, PPVRTC_G3H is 3.33v, PM_DSW_PWRGD is 3.412v. We're using a real 85w MagSafe. Board suffered liquid damage, but sadly this is all we know.
I have a liquid damage 820-3787 that gets Green Light, No Fan Spin. The corrosion seems to be focused around the IO Board Flex Cable Connector J9510. I've investigate the U7501 area pretty closely as well as the U1950 and U6100 areas as this board is missing PM_SLP_S4_L.
PPBUS: 12.57V
PPVRTC...
This board came in with liquid damage around the ISL and TPS chips. After repairing the obvious liquid damage the computer got a green light, fan spin, and three beeps. I noticed this capacitor had exploded and part of it was up under the edge of another RAM module. My board view for 00138 seems...
If you have an 820-2914-B logic board which is from a Late-2011 17" A1297 then you'd want to use ASD 3S148. If you have a Mid-2010 MacBook Pro then you'd want to use ASD 3S138.
This board came in with signs of prior repair around the SMC, and U4000/U3900. After removing remainging underfill and properly reflowing the SMC, the unit powered on chimed once and then shut off. PRAM resets would not work, SMC resets would. I tracked it down to a BIOS issue the original BIOS...
It will load into a bootable High Sierra disk and will start installing a fresh OS on a known good SSD, however when it reboots following the install into the OS for the first time the issue of the black screen and rebooting starts again.
I have a 2015 A1398 that came in with no signs of liquid damage or other physical damage. The computer powers on and passes Apple built in diags. The computer will load up and about 80% through the loading progress bar then the screen goes black and reboots. The heatsink gets incredibly hot when...
We can mark this guy resolved! I put it through the cleaning process one more time and things are all good, probably crap that didn't get fully cleaned the first time.
I have a Crest 2.5 Gallon without heat. Using the 103 mL of Branson EC per gallon of distilled H20. I was low on 99.9% IPA when I did the post cleaning alcohol bath before going into the toaster to dry I am worried I didn't get all the water off the board even with 30 mins at 200 F.
This computer had the GPU cap problem. I replaced the cap with the larger capacitor and verified that the repair was working and the GPU passed stress testing. I then put the board in the ultrasonic to clean of the leftover flux, after the cleaning process the computer only chimes and POSTs with...
Yeah I've tried pulling U8000 and the short is still present. I'm guessing the client was using a Chinese POS charger and killed this thing. Will I have any luck with injecting current? As of late all I ever seem to get are hot lead wires!
Got the PP5V_S5 short resolved last night it was C7505, 3V3 is still sorted to ground and after replacing U7501 a second time (after resolving the C7505 short) U8000 is getting hot and I have a 3 Ohm resistance to ground of PP3V3_S5.
PP5V_S5 is shorted to ground, as is 3v3_S5. VREG3 and VREF2 are not shorted to ground. Is there a funny name for the VREG5 rail?
Diode mode on VREG3: 0.568 and VREF2: 0.541.
Should I inject voltage on the 5V and 3V3 S5 rails or will that damage sensitive 3V3 components?
Got a board in that has no signs of physical or liquid damage. I get proper 12.58V on PPBUS. After plugged into the MagSafe the TPS IC U7501 gets extremely hot. I replaced the U7501 as well as the 2 MOSFETs and the shorts on the 3v3 rails was removed. However even after replacing those...
I get 0V on PPVCC_S0_CPU as well as the PH1 and PH2 variants of the rail. I do have the 8.58V on ISNS Computing rail going to the FETs 7310 and 7320 I do not have any of the data lines going to the FETs to prompt them to open. I thought this was because the controllers were not being told to...