For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.
820-4924 ( changed the SMC because of another problem with charging the battery and then shit hit the fan. The display stopped working!
SMPS = 20v, power up on 400amp, and then stays at 700amp.
Red water marks visible. Small corrossion on two components next to U7700 (backlight IC)...
hi 2informaticos, sorry late reply, was busy with my other businesses..
I dig the bottom, there is no continuity now.. But the resistor 10 ohm, still exploded after putting a new one... So strange. what could cause that to happen.. ? The trace is inside the board to the other side.. wont be...
C6991 is shorted to ground. I detached the CAP. the short is still there inside the board it seems under the pad... How do I go about to solve that issue? drill a hole in the board through it?
(pp3v42.. forget that, i was just mumbling.)
Ok, I will check that and revert back. the problem could be with PCH.. . If its not the trackpad and flex/board as u described.. earlier the PCH became very hot. when I didnt have any image. maybe that was because I used 2.5 amp with SMPS the PCH got hot... or maybe some short inside of it...
I reball the SMC and change it to a new one, there was a trace broken under the smc on: SMC_PBUS_VSENSE LINE. i ran a jumper... that might have been the cause of the problem, because i previously changed the SMC a few times(stupidly) probably pulled it by then. However, now I have image and the...
i have usb activitiy now....
Customer said the macbook wont charge and is dead.
I changed the clock IC Y2705 and it started to work again. but now it wont show any image now and only drawing .600 amp.. thats what I have so far. i'll continue to hunt down more clues..
Hi Gents, 820-3209A (no image)
19v on SMPS and draws 0.633 amp.
So far i have:
PP3V3_S0 = 3.3
PP1V8_S0 = 1.8
PP1V5_S3 = 1.5
PP1V5_S0 = 1.5
PPVTTDDR_S3 = 0.680 (my DMM sometimes shows lower voltage) i think its good enough 0.75v.)
DDRREG_FB = 1.3
DDREG_EN = 3.3
PPVCCSA_S0_CPU = 0.8...
1. U2700 output pin 9. SYS_CLK_25M - --> Question: Does it need to be a 25mhz stable clock frequency here? There is pulsing frequency now.
2. Y2705 Clock. Question: Does it need to be a stable 25MHZ frequency here? There is pulsing frequency now.