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1707 -928 board I did a simple flex-gate. Customer returns with random crashing. I don't see random crashing. Crashes everytime right after login about 1/3 of way of loading.
Inspection I see no corrosion etc.
I have tried: new screen, battery, trackpad
I have replaced: U7410, 7210, 7420, 7230...
820-2936 Water damage. Have made lots of progress. PPBUS_G3H is 3.23V.
I don't have my 3.3V rail, but do have PP5V_S5. I notice if I diode mode to ground on L7220-1 I get 0.130. I have changed Q7220 and also changed U7200 a couple times. Once I change I do my diode mode reading and something...
I have this MB that came in stone dead several weeks ago. There is no water damage. When I checked the rails I found there was no S4 rail. So what do I do when I see there is no S4 rail? Change the SMC.
I changed the SMC and all was good. Customer comes back in a few days crying there is no...
I've been working on this board for some time now. It was slightly water damaged and had no green light and was missing some rails.
I changed the SMC and have green light and all my power rails. CPU gets warm. Fan spins for 8 seconds, off for 4 seconds, and on for 4 seconds, and will turn back...
I found a short on PP1V05_SO, I pulled L7620 and seen it was on pin 2. So I tried some caps above it and pulled U7600. Short still there. So I injected 1.5V into C7660 and see that U1400 gets hot first when freeze sprayed.
I can assume u1400 is bad, correct?
I did a USC at different angles also...
No water damage, no visible corrosion.
Tried PRAM reset with a new keyboard (don't have external), connector looks good.
Tried SMC Bypass, Safe Mode, known working drive.
Don't have USB mouse, used iPhone w/ammeter and see that it is charging the iPhone 1.5A I think it said.
VCore is 1.74V...
A1466 came in stone dead. No PPBUS_G3H. Resistance to ground was near 0. So I injected 4.0V into G3H and see that Q7560 go hot. Changed it and only got 0.5V on G3H. Found F7140 was no good. Changed it and when I plugged in DC power Q7560 started to smoke. I see Q7560 does go to ground, so it is...
I tried all the resets, won't do safe mode. Will only show the logo and then nothing.
Was water damage around the LVDS on backlight pins only, really light. No backlight, but with new LCD assembly is backlight. Don't see any other liquid anywhere. Ultrasoniced anyways.
I've checked the drive is...
I was changing the screen and think something with the screen was wrong. I witnessed L8300 turn bright red and blow. I changed it and watched it blow again. I did this about 3 times (it was pretty cool).
I have tried multiple know good screens (brand new) and don't get any image.
A long time ago I put a late 2013 LCD only into a 2015 lid and it has been sitting here for years.
Now that I install into a late 2013 L8300 keeps blowing. Is it the 2015 lid causing the problem I am guessing. Probably the backlight in the lid correct? So the LCD and lid have to match as well...
Macbook with no working trackpad or keyboard. Did a battery unplug and all is working fine. Next day, again, not working. Any ideas? No clue on where to start if its working.
I've seen the IC in one once with a cracked IC and changed it and all was good. But this is kinda strange.
A1268 customer brought in with exact same issue of distorted screen (minus the vertical bars), placed on new screen and same effect, except with vertical bars on the new screen.
Have you guys experienced this? Did I damage the LCD on install or is it a known board issue?
-pm_pch_pwrok & apwrok
U1950 have pp3v42_g3h
Have I been paying good attention with where I am going?