Recent content by bcherdak

Hey guys! I have a 820-4924 with no backlight. Small notes: LCD is good, tried it on another 2015 macbook pro and full image with backlight, so narrowing it down to the motherboard issue. Shined a light behind it, can see the apple logo and then the users profile icon and name. Webcam is also...

RAM Has been reflowed Did not solve issue. then I reballed the ram with a stencil and that did not also solve the issue, Are there any voltages I should check to see if voltage is going to it?

Did you take photos before cleaning the board? Corrosion was around LCD connector and JTAG connector in the center, Removed JTAG and also replaced LCD connector. "Maybe is better to reball non-working chips." How do I know which chips are not working, is there a voltage measurement I should...

Hi guys, got a 2015 macbook pro retina here and after repairing liquid damage computer fully passes "D" test diagnostic but is only reporting from "About My Mac" that it has 4GB ram installed on 2 banks. Looking up in GSX it shows that it comes with 16GB of ram, I am guessing that 2 of the...

Will try new Bios chip, Will bad bios cause no startup or partial startup? any voltages you are wanting me to measure with this new Magsafe charger?

Bought an OEM 85W magsafe 2, CPU heats up for a few seconds then cools back down and does not heat up again only until I unplug charger and replug it in. If I do it enough times plugging it in and unplugging it, cpu heats up and fan spins for a second and then stops. Any other voltages looking...

"So it tries to start on charger only." When in the housing with an lcd connected and a trackpad and keyboard, NO BATTERY connected, it does not try to start up, trackpad is not clickable. CPU does not heat up. When its on battery in the housing, it trys to start up, Taptic feedback trackpad...

"So starts at least, with charged battery?" With OEM battery connected, it starts kind of, trackpad is clickable (Taptic feedback), cpu heats up, then trackpad stops clicking and cpu cools down. And doesn't even start with charger alone?" When no battery connected but 85w MagSafe is...

"Be sure to use original Magsafe 2 60/85W charger." It won't even start with a fully charged original battery from a working housing/chassis. It starts for a few seconds, pressing trackpad, cpu heats up and then goes back to nothing. Will test with a brand new charger from apple store, will go...

Thank you so much for the continuous support you are giving me! I very much appreciate it. VOLTAGE // OHMS MODE // DIODE MODE PP3V3_S5 = 3.34v // 300Ohms and climbing // 0.1V (diode mode) PP3V3_SUS = 3.34v // 10K Ohms and climbing // 0.425V (diode mode) PM_RSMRST_L = 3.34v // 130k Ohms and...

"Didn't get 12.5V on PPBUS_G3H yet?" FINALLY 12.58V on both sides of the F7140 fuse Any more measurements you are looking for me to take? PP5V_S4 still 0V S4_PWR_EN - 0V

Replaced u7100, and reballed SMC, trackpad clicks for a few seconds then stops. CPU gets warm and then cools back down, After that I replaced SMC from another board 820-4924 and same thing, trackpad clicks for a few seconds, (taptic feedback) and then stops. Same issue, any more suggestions?

"I specified you to FIX on battery bus (SMBus 5)." I will replace u7100 and reball the SMC, will post with results. Thank you!!!!!

"If we talk about the SAME (common) bus between different chips, why do you check R5350/51???" I was just measuring all the SDA, SLC lines that I see with that substring included in openboardview and the schematic pdf, I do apologize. Question, what are the smbus_smc_0...

Hi diode mode readings u7100 PIN 10 (SCL) - .52v PIN 11 (SDA) - .52v SMC R5350 (SDA) - .73v R5351 (SCL) - .73v are these the right resistors to test from? I cannot find any others.