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Came in with liquid damage, Coffee was spilt into the mac before christmas! It was pretty grim when I opened it up and it had 3 or 4 real bad spots of corrosion!, Its had a good clean and after passing through the Ultrasonic the board looks like new again, I get just 5v / 0 amps on...

Chips arrived today! Replaced U7701 and Boom! backlight returns! Another one fixed. thanks dude,

Ill order some U7701 chips now and replace , thanks dude

100% get image can even shine scope through back of lid and log in. BKL_EN = .233v BKL_PWM = 00.3mV This can't be related to me leaving out C7714 can it? cant see how! just tried this logic in another known good machine same result all good can log in just no backlight

LCDBKCT_EN_L =3.70v ( Seems to move up and down a bit to 4.5 then back to 3.7 PWM =0v Q7706 1- .270v ( Seems to slowley drop ) 2- 17.0mV 3 - 6.08v 4- 8.55v 5 - 1.940v 6 - 1.508v Q7707 1- 0v 2 - 3.33v 3- 3.10v 4- 0 5 - 0 6 - 0 All resistors measure good

Will check output rails shortly, reflash U4770 , This is a new one on me, presume this cant be done with medussa,? I have a ch341A does this do the correct voltage for this chip, and realistically how much of a ball ache is and what kind of success does it have? Im more tempted to hand this...

In for no backlight, I cleaned this up and replaced, R7755 C7710 R7741 Left out C7714 as top pad was missing. I have 3.42 at SMC_lid tried Pram reset 3/4 times Did a gentle reflow on U7701 Other side of board I get 8.55v at F7700 but on xw7720 I get 0v. Does this look like a bad...

Tried a few times,. Just get this each time

Going over all the coils I can find. Nothing pulses at all L8410 - Starts at 30,0mV and slowly drops L8456 -5.1v solid L7220 - 0v L7270 - 0v L8102 -0v L8100 -0v L7030 -9.80v solid L7690 -3.23v solid L7670 - 5.08v solid I'm stumped.

checking for pulse on ssd I checked C9074 -12.57v solid L9030 - 1.80v solid L9020 -.908v solid L9021 -.908v solid L9080 -.2.51v solid L9080 - 2.51v Solid Not sure what else to check here? ALL GS3 voltages are present and correct and solid Measured with just charger no battery connected,.

anything else I can do with this dude?

Kinda knew this but just dont have another one of these boards to use as a comparison, Is there another method? Does the Paul Daniels - flexbv contain this information?

Before even removing the board, ( Obvs no bat or power connected ) I get continuity beep to ground on both sides of L7270 L7220 L7410 L7420 L9080 dosent short to ground,

Worth a reflow?

It does the same 4 second on 4 second off power cycle but this time with high fan spin when the 4 seconds on. Video of it here

Had a guy call me today that said his macbook had stopped turning on and he had taken it to Apple to repair, They told him originally that it was a faulty logic board and quoted over £1000 to repair. Then whilst thet still had the mac they sent him this,. I agreed to take a look for him. The...

Diode mode to ground L6995 = .331v Measured it in Ohm scale, V3V3G3H_SW = 11.80k PP3V3_G3H_VR = 52.2k

PLT_RESET_L comes high? Yes 3.30v when it power cycles on, Its still doing 8 seconds on 4 seconds off, ( When measuring this i measured on R2013, Whilst doing so R2013 pinged off the board, hardly any pressure from my needle tip multi meter probes, Whilst grabbing a replacement R2013 from a...

Just gave the bios a go and exactly the same behavior, USB light blinks once, fan spin for 3 or 4 seconds and trackpad click, nothing else, I did just notice that the trackpad stays " Clickable" for around 8 seconds then stops been responsive for about 4 seconds then becomes active again and...

I dont seem to be able to locate the board-view and schem for this 00840-A are we using the 00875 set? Not sure if this is correct but can I check for CPU core on L7210 + L7220? if so im getting (.957v) on those and the caps that leave them going to the CPU, I do not have a good bios for this...