Search results

Hi all, I have a 00928 board on my bench. It came in with 5v 0.21a, PPBUS was 0.5v. Found that C6913 was getting molten hot so replaced it and now the machine gets to 20v and comes on, but it only gets to a "charge battery" screen for a few seconds and then shuts off. This happens with both...

Changing U3900 solved this one, thanks! Took a few times to get it to sit perfectly.

Did a double check on my initial measurements and I found that PP1V35_CAM is missing. I have CAMERA_PWR_EN. CAMERA_RESET_L is not low. What else do I need to get this rail to come on?

Hey all, having issues with a stubborn 00840 board. Came in for liquid damage and a new screen, repaired the liquid damage and the board is working great except for the webcam. In system report it doesn't show up at all, tested with a known good display assembly. ALS does work however. I checked...

Hi all, having an issue with a keyboard on an A2179. Had 2 come in for topcase replacement, one also needed a trackpad due to liquid damage and the other we re-used the existing trackpad. On the one with the re-used trackpad, everything went fine. On the one with the new trackpad, the keyboard...

Yeah, L9060 is around 4.2K ohms

Sorry, double checked and my PPBUS is actually 2.4 ohms. But the resistance between the mentioned coils and PPBUS is the sum of the two of them to ground, so onward. No coils on the board give 2.4ohm resistance. Would my next step be to inject a small amount of voltage into PPBUS?

I have an 820-01521 on the bench with a PPBUS_G3H short, 5v 0.01a on the charger. Getting 30 ohms on PPBUS, checked L7410, L7430, and L7210 and they aren't the exact same value but all are between 8-20 ohms, on a working board I'm getting 70 ohms. Does this mean the CPU is likely toast?

Hi all, have a 00165 on the bench that's being stubborn. Has green/amber light but no fan spin, 20mA from the power supply. Originally had some corrosion around U8130 and J6100 and the DC board and flex were destroyed, replaced the board and flex and cleaned the corrosion, got green light back...

Yeah, same result with just the board on the desk no SSD or anything else. I'll do another pass around the liquid affected areas and see if anything looks out of place or damaged.

Hey all, have a 00840 on the bench right now that's not booting and has no caps lock/USB activity. Was liquid damaged around U3770, cleaned up with heat and flux. Has proper PPBUS, PP3V3_G3H, and ALL_SYS_PWRGD. PLT_RESET_L goes high, L7210 stays at 0.98V and doesn't budge. Checked R1320-25, all...

L7410 seems to be as well, I'm getting 4ohms in resistance mode

I'm also now getting a stable 3.3v at C6912

With R6934/35 off, PPBUS is stable 12.29v. Will have to do some more investigating in the U6903 area.

Getting 1.3ohms resistance/001 diode on PP1V8_SLPS2R. Does this signal originate from the T2 on this board?

Have an update on this one. Got the chips in and replaced U6903, rebuilt the area around it from a donor as most of the components were nasty. USB meter now shows 5V 0.05-0.06A. Nothing on the chip has a diode reading under 400 so nothing seems shorted, but PP3V3_G3H_RTC goes up to 3v and then...

What are y'all using for microscope cameras? Just picked up a new scope and I'm looking for one that won't break the bank but still has decent image quality. On my short list so far is this Mechanic one. Any other ideas? https://www.aliexpress.com/item/1005001864091613.html

The 820-00239 uses an ISL9239 which is fairly regularly available. 820-00850 uses an ISL9240 which is different and unfortunately can be a pain in the ass to find. These are not sold to anyone but Apple, so anything you find online either lacks firmware to make it work or is a pulled chip of...

I had an A1706 come in for a keyboard replacement due to a bunch of keys breaking off, I've heard the horror stories of trying to replace the keyboard itself so I ordered a topcase from MobileSentrix that came complete with battery, keyboard, trackpad, and touchbar. Upon swapping everything...

That's a very good point. I will have a chat with the customer and explain he probably won't get much of a benefit. Thanks for your thoughts on this one, appreciate it.