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Is there a way to tell if a dc in board is good or not? Besides trying a known working board as I don’t have one. I unfortunately don’t have any other dc in boards nor do I have a working board to test this one on. Looks clean. Tried to find a board view for the dc in board but it looks like...

Thanks. R3742 still reads ground on both sides after removing U3740. Pin 1 on U3740 is slightly corroded but otherwise looks fine. I've left it off theboard for now. ISL Pin readings with a donor installed: pin 1: 15.27, pin 2: 16.22, pin 3: 16.15, pin 9: 0, pin 12: 3.42, pin 13: 3.37, pin...

Hi all, i bought another donor board off eBay to have a look at last week. 3437 which has no PP3V42 or PPbus shorts. In fact PP3V42 is present but I’m not getting a green light on the charger. There is sever corrosion on C3740, R3741 and R3742. U3740 looks ok though but I’ll probably replace it...

Ok checked at the test pad for the other cd3217 (u3100) and both are reading 0.638 diode mode so it looks like both aren’t short at least. Haven’t got a second working board but am thinking of getting some 1598 donors off Ali express. Need to get some tweezers so I might as well get some donors...

I did do diode mode as well which was 0.62 on pin 2 of DZ3350.

Ah ok that explains it thanks did not know that. I think I’m going to replace all the glass looking diodes. First few are cracked, missing and the rest bar the top one are reading both ways so they look like their blown. Probably change all of them just to be safe. Not yet no the missing...

Ok I think I know what the problem is. Pin 18 on J3300 is now missing. Pin 19 outside section and bottom section of the connector are there but the inside section towards the other rows of pins seems to be missing. DZ3351, DZ3352, DZ3350, DZ3353 are cracked or partly missing. Pretty sure this...

I’m starting to think I got really unlucky and also blew the cd3217. USB_SOC__TYPE_P has no shorts on it, 667k to ground both on the test pad and re014 and pin 7 of ue010 and no voltage.

Rechecked VDDA and the isl is outputting 5v to it but only for 30 sec than it turns off and the rail drops to zero. Looks like somethings pulling too much current and causing the isl to shut off.

I do. I shorted the se030 pins to turn the board on and pPbus at f7000 is 1.28v. When I first received the board the previous owner left the battery connected so when I opened it up the cpu was quite hot so I imagine the battery is pretty low charge. I then connected the charger and still 5v...

Ok plugged in the battery and it’s data cable only and now we’re back to where we were earlier, after replacing the isl but before removing R7191 which was the step that gave us 20v. 5v not 20v. I’m gonna be cranky if the isl has blown again! I only connected the battery none of the other...

Ok fair enough I’ll hook the battery up and see if anything changes. Hopefully the battery did not get damaged in the crushing of the chassis that cracked the trackpad and screen. It looks fine not puffy so hopefully should be fine.

Ok thanks I’ll see what I have around 3k. Better to go high than low. I’m going to try figure out why the other ports turning the meter off before I connect the battery. My understanding is that you need both ports working for the system to boot so probably should sort that out before connecting...

No worries. It’s on page 65 of the schematic towards the bottom left side of U7100 ISL95828. Line it’s on is COMP_C_CPUSA_L

T2 shield and CPU heatsink are getting quite warm. Not hot you can leave your hand on it but pretty warm. Is it worth taking the T2 shield off and inspecting? I’m hesitant to do that as I really struggled to get the thunderbolt one off and don’t want to float anything.

Sorry, forgot the K in the 2.7 metric earlier. Wasn’t sure if it would work with anything but a 2.7k. If I can use anything else than sure I’d be happy using that as long as it would work. I believe the tolerance of this resistor is 1% so that would be +- 100 so a max of 2.8k? The schematic I...

Finally received my replacement ISL 9240 today. Installed a fresh one and now VDDP is 5V. A friend told me to check R7191 as he has had it cause him issues in the past. Is that suppose to be a 0 ohm resistor or 2.7 ohm? The schematic on bad caps says 2.7 but the schematic from xin zhi zao says...

ok i bought 15 donor boards should hopefully be here tomorrow. 3 of them will have the 9240 on them so I’ll try one of those and see how it goes. Don’t want to do another charge case there 200 bucks here unless I find a used confirmed working one. if that does not solve it might have to mark...

Yes the photo was taken before reflowing the ISL so C7023 was still there. It was during the reflow that the cap flew off. I thought 30 air flow would be enough to prevent that but it was still too high. It’s awkward because of my Barlow lens I do not have enough work room to be able to go in...

One thing I noticed is before reflowing the isl I was only getting 150ma occasionally, most of the time both ports would give 57. After reflow both consistently gave 157ma. that said looks like it’s not the ISL. replaced it with one pulled from a xr case and re balled. Checked and made sure...