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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. NO Display 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...

R6905 keeps blowing up before diode D6905 and reaching pp3v42. Any idea why? Its been trolling me for some time now.

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.... history: 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..

1. USB activity is missing 2. Backlight and no image. correct! 3. External monitor, nothing. black screen

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...

2informaticos thanks buddy. So in S0 state then..

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.

does anyone have the files available u can post here pls?

I have 8.6 now on PPBUS after changing the SMC. When I connect the SMPS I get a short fan spin and then fan stops. Stuck on 0.020 amp.

Diode mode R5281 = Pin1: 0.800, Pin2: 1600 R5280 = PIN1: 1600, PIN2: 0.800 I happen to miss the voltage lines: SMBUS_BATT_SCL (R5281) = 3.4v SMBUS_BATT_SDA (R5280) = 3.4v

I reballed the SMC.. and now i have FAN SPIN with 0.500/600 amp and still 8.2v.

Ok, so need to get the PPBUS up to 8.6v first...? So the board need to have the correct voltage for battery in order to power on? Basically both adapter and battery voltage needs to be present? 1. I have intermittent green/yellow light on charger. (1. I changed the i/0 Board and the cable...

JohnB8812 Macbook air only needs 8.0-8.20v from my understanding of PPBUS..? 1. I removed C7910 and I have now on R7911 = 3.3V on both pins. DDRREG_EN and USB_PWR_EN both getting 3.3v. 2. U7300 I get all the input voltages except =DDRVTT_EN 3. =DDRVTT_EN takes me to MEMVTT_EN. (here is it where...

Missing: DDRREG_EN = 0v USB_PWR_EN = 0v PM_SLP_S4_L = 3v3.

U7400 I have: 1. CPUIMVP_VR_ON 2. VIN Missing these output voltage/signals from U7400: 1. PGOOD (CPUIMVP_PGOOD) 2. PGOODG (CPUIMVP_AXG_PGOOD) CPUIMVP_TON = R7402 = Pin1 8.2v, Pin 2 350mv. Its a 90k resistor and it measure ok. U2750 (AND GATE ) 1. I have ALL_SYS_PWRGD but missing the two...

Cool. i check now direct and post shortly.. Havent checked USB circuit yet. anyhting special to look for on that line? yes, i meant signals. thx.. Known good BIOS is an option to try. You mean replcing the currrent one?