Search results

I actually just tried to rewrite the original bios AND did a nvram reset. With R8911 removed, I should have a complete black screen but I DID NOT. I see the exact same thing as I mentioned above. white screen-> apple logo->black screen but illuminated. I also saw Q9707 area has flux and...

all big coil diode mode reading (Red on ground) L9710 447 L7795 427 L7260 309 L7220 328 L7031 350 L7030 350 L8020 003 L7425 042 L7415 042 L7630 016 L7330 0 L9560 87 L9510 122 I also measured C7325 and the short come from pin 2 side of it only. pin 1 is not shorted. Bad Q7335?

Board initially have fan spin for 1 second and stop, there is flux around the GPU so it has been worked on, removed R8911 and flashed bios with "820-2915 Ok no GPU clean ME.rar" and now it chimes and boot up. But fan stuck at high speed, as soon as it finished with the Apple boot logo and the...

sorry my bad... i think because i didnt put in the ram in there and so it shutdown? Not sure what but the board seems to be ok now.

yes short is on the pad 2 of f7040/1 Do you mean the ohm value of L7330? It is 0 ohm to ground. Or are you refering to ohm value of others? do I remove the F7040/1 again to measure?

removed F7040/F7041, pin 1 pad is 8.35v However, put F7040/F7041 back on, pin 1 would become 2.04v also measured L7330 is shorted to ground.

you are right. Q7080 is bad, got it replaced, now green light stay, 12.5v at F7040. But the fan now start and then stop. No ram. PP5V_S5 5v PP5V_S3 missing, diode mode 316 PP3V3_S4 3.3v PP3V3_S5 3.3v PP3V3_S3 missing, diode mode 254

yes voltage cycling at F6905. Using a fake charger: 1) 16.46V at R7080 pin 1 2) 12.5v at F7040 3) PP3V42_G3H is 3.45v (measured at L6995) no Fan spin.

observation: 1) gmux jtag has flux and solder sign 2) L6995 come loose but solder is tight and continuity good where should I start the witch hunt?

Yes but you told me to remove the U7000 already... so with U7000 out, those are the reading from pin 10 and pin 11 and you said less than 1% difference allowed. When you said "Remove other components connected on that bus", were you refering to components that are attached to pin 10 or pin 11?

the diode mode value of pin 10 seems to be correct as I cross checked with a good board. the other components on the pin 11 bus seems to be only: J6950 , J6955, C6953 (removed), D6950 (removed), R5281(resistance value is good and same as R5280) and the SMC Did I miss anything?

yes, actually not exactly pin 10 and pin 11 as the ISL6259 has been removed as per your instruction. I measured these value at R5280 and R5281 and diode mode show these value.. are they not normal?

diode mode: pin 10 584 pin 11 1088

you are right.. short is gone after remove U7000...

i checked pin 2 of D6950 is shorted to ground...i removed it to test, doesnt help. I also removed C6953 to check, doesnt help. Bad SMC?

ah.. R5281 is shorted to ground.

how do i fix it? Also, how come yesterday I was getting ppbus_g3h at 12.2v below i blow the ISL6259 and now after replacement it is 8.1v?

pin 2 16.4v pin 3 3.95v pin 5 1.1v pin 6 3.3v pin 7 0.8v pin 8 1.35v pin 10 3.3v pin 11 0.03v pin 12 3.4v pin 13 3.4v pin 16 3.5-4.5v cycling (measured at C7026) pin 17 8.15v pin 18 8.15v pin 19 5v pin 20 5v pin 21 0.27v pin 23 8.22v pin 24 8.35v pin 25 12.58v pin 27 16.28v pin 28 16.28v

I have replaced ISL6259 but now ppbus_g3h is 8.1v... did I solder a bad chip or something is blown?

can I replace ISL6259A with ISL6259 (non A)?