Search results

Regarding my last post; the battery was dead, i replaced it, the macbook was able to boot properly then. The death of Q7320, Q7321 probably caused to battery, or the battery caused the problem. Anyway, this part is sorted. Regarding the image size on screen after boot, it was caused by the...

Good evening, I have a MBP 2012 with 820-3330-B logic board without Backlight but with image; if I apply some light from the back of the lid, I can distinguish a "question mark folder". The LVDS J9000 connector had obviously been damaged; pins 38, 39 and 40 burnt. Connector now removed. 0V on...

Almost fixed. Now the MacBook is able to boot; but it takes 24 seconds. It's quite slow. Furthermore, it does not see the battery anymore. And at the end of the boot, the screen first displays an image on 70% of its surface, then switch to black, and then display the image on 100%. That's weird.

well, since I did not find any direct connection point between PPBUS_G3H and PPVIN_S0_CPUVR, I assumed that the resistance should be different from 0. But you're very likely right, you have more experience than I have, obviously. I replaced F7140, Q7320, Q7321, put back in place L7310; L7320...

So, I removed Q7320, and now there is infinite resistance between pin2 of F7140 and pin 2 of my not-lifted L7320. No path anymore so...expected. However, I have 0 resistance between pin2 of F7140 and pin 5 "below" Q7320 (removed). Not normal. Pin 5 is PPVIN_S0_CPUVR. This is also VIN of U7200...

Not yet, wanted to check everything I need prior to order the necessary components. As I said, I'm just starting with the logic board repairs; I dont have donor boards to harvest for these 13" 2015. I'm checking the usual/common failures on these models and filling my cart. Will receive...

Edit: you're right, there is 0.1 Ohm resistance between pin2 of F7140 and pin 2 of my not-lifted L7320, so, there is still a problem, as you said

Well, I had measured resistance from pin 1 of L7320 (lifted) to ground, I had 0 Ohm; now that the dead Q7321 is out of the board I have > 20kOhm. So, no short anymore on this side. On pin 2,with L7320 lifted, I had 14 Ohms. I soldered back the L7320, I read 10 Ohms now, lower because of the...

Regarding the short: I had a very small resistance on pin 4 of Q7320; 0 on the other pins. And I had 0 ohms on all the pins of Q7321. I therefore removed Q7321 first. Now on the pins below Q7321 I have: pin 1/2/3: 0 Ohm, ground, as expected. pin 4: >800kOhms "pin5": >200kOhms And on pins of...

Thanks; I will come back on this part of the issue asap, give it a xth thought, and answer the questions. However, I must apologize because I was working on 2 similar boards and while I checked the presence of PP5V_S0 on the second one, I forgot to do it on this one... I suddenly realized that...

"What do you expect measuring from pin 1, if F7140 is burnt (open)? " If I measure the resistance from pin1 of F7140 to ground, which is 8.3 kOhms (and identical to the measure from pin 1 of L7130 to ground, pin 2 of L7310 to ground, etc), then I get the resistance of the circuitry between the...

Good evening 2informaticos, I dont have any 45W charger. Besides, I always use 85W for 15" and 60W for 13", and always the same chargers for all my mac. Since this is only the second logic board I'm working on, I've never tried to trigger anything directly on a board so far; SMC_ONOFF_L goes...

Hi 2informaticos, thanks for your help; I guarantee you that I try to understand what I read... Here are the measurements: Resistance between F7140, pin1, and pin1&2 of L7320 is 399 Ohms. Resistance between F7140, pin1, and pin1&2 of L7310 is 402 Ohms. And Resistance between F7140, pin 1, and...

Hello, I have a 820-4924-A, on which liquid was probably spill. Charger's light stays amber. No boot. I found similar thread there : https://boards.rossmanngroup.com/threads/820-4924-no-pp5v_so-s3-s4-rails.53764/ I already measured the below: PPBUS_G3H: 12.66V (F7140, pin 1&2) PP5V_S5: 5.06V...

Good evening, I have a 820-4924-A logic board with amber and green light on the charger. The board is currently out of the MacBook,and not connected to anything besides the charger. I measured PPBUS_G3H on the fuse F7140. Pin1: 12.68V Pin2: 0V I unplugged the board, tested the fuse with...

Indeed, beep not equal short, sorry. Will try to find a working board tomorrow evening. Will also try to boot in SMC bypass. I will update this thread after. Regarding 3V3_S5, I measured it on R7832 pin 1, C7831 pin 1, Q7830 pin 1,2,3, and R7812 and C7811 pin 1, I systematically get a stable...

Hi 2informaticos. Thanks for the swift answer and the welcome. Regarding the artefacts and boot issues, I had tested with/without trackpad, with/without battery, and with/without a new battery. It never changed anything. But I suggest we ignore all of this for the time being, since it's likely...

Hello there, I'm trying to fix a mistake, very likely mine, whose consequence seems to be an unstable 5V rail, on a 820-3332-A logic board. Context: Initially, I had no image on both the external display and the laptop screen; since PPVCORE_GPU and PPVCORE_S0_GFX_REG were 0V, I applied some...