2024-02-23 1557 -0500
I've traveled to a public place (i tried a new one, it's a little awkward where i found) and set up some.
My goal: try to use the mediatek bootrom reset information I've gleaned to make progress on one of my broken phones. I've brought the
Sadly I've run into an issue right off the bat. The screwdriver I have only goes down to PH1 which is too big for the screws on the phone. I crossed my memories of opening it in the past, they must have been from before I got this screwdriver. It seems I'll need to get a smaller one (or go somewhere with screwdrivers).
Apologies !!!!! !!!!!!!!!!
It was pretty hard to get here. I hope I try to do this again ! I'm so close!
I'm back, hopefully with a phone repair screwdriver! It's 17:35. 1743 I've removed all the screws from the back of the phone. At first I thought I had removed all of them, but it wouldn't quite come off. It turns out the upper-left-most screw in the back of this HPP-L55B has a small round plain white sticker over it, the same radius as the screw head. This must be a way to detect tampering. 1745 i've found the two parts of the volume buttons that were called 'switches' in the motherboard repair intro videos. i'm opening the analog multimeter to test them! It took me some precision ogling and pressure with my nail to realize I could still press activate them without the plastic buttons. 1757 I'm not getting conductivity on the tiny flexible board-like thing under the power buttons, maybe it is all covered in something. But there is a sticker over the cable connection to it, and when I remove the sticker 6 connector pins are exposed. They have conductivity like this: - gnd - volup - voldn - pwrbtn - pwrbtn - gnd The ones that aren't ground become conductive with ground when the associated buttons are pressed. The labeling could be inaccurate as the pins are much smaller than my multimeter leads! 1759 I'm wondering if the video on identifying an unlabeled kcol0 was bogus, because the buttons appear to use ground as their shared spot. I'm not sure. There are a number of unlabeled testpads here. 3 of them by these buttons. 1800 by experiment i found the 3 test pads by these buttons behave the same as the buttons: when the buttons are pressed, they short to ground, in the order PWR, VOLDN, VOLUP. There are 5 more testpads on the other side of the SD slot, two near another cable, and 4 on the other side of the cable by the battery which also has 4 pins. I haven't removed the boards from the body of the phone at this time. 1802. I was thinking of looking online for ideas of where KCOL0 tends to be. I could also read the chip spec and see what its function tends to be. 1802. 1828 I found a post on the internet recommending to refer to the pcb design guide for the chipset. I found some more documents on a russian website, but again the mt6737 seems more available than the mt6739. 1839 looking at mediatek pdfs i've found kcol0 is also called kpcol0 as well as kp0col, which opens up many more locations it is described. 1842 I found the kp0col pin at AE6 in the MT6739 ballout, so that's where it is in this actual processor. I haven't found it for the mt6737 that i have more docs for yet though. but we could trace it on an x-ray or something now maybe! ;p 1843 1843 1845 i found kpcol0 at AL24 in the MT6737 ballout. it's in the unlabeled region between the BPI bus for c2k and the camera in the design guideline doc. sadly i'm not seeing it otherwise mentioned 1846 i got a lot of cool files so i'll try to share 'em. i'm attaching the below pdfs. the zip is in the tar on arweave but isn't attached because it's >100MB. i found the files on a paid-access forum online. it had lots of other files and firmwares that i did not scrape. drwxrwxr-x user/user 0 2024-02-23 18:48 2024-02-23-MT6737_MT6739/ -rw-rw-r-- user/user 5486174 2024-02-23 18:24 2024-02-23-MT6737_MT6739/MT6737 PCB Design Guidelines-English-V0_1.pdf -rw-rw-r-- user/user 4632618 2017-11-17 05:04 2024-02-23-MT6737_MT6739/MT6739_LTE_Smartphone_Application_Processor_Technical_Brief_V0.17.pdf -rw-rw-r-- user/user 932679 2024-02-23 18:27 2024-02-23-MT6737_MT6739/MT6737x_Design_Notice_V0.1.pdf -rw-rw-r-- user/user 145632212 2024-02-23 18:30 2024-02-23-MT6737_MT6739/MT6737.zip Archive: 2024-02-23-MT6737_MT6739/MT6737.zip Length Date Time Name --------- ---------- ----- ---- 0 01-12-2016 11:03 MT6737/ 188794 07-09-2013 16:45 MT6737/CT2520DB26000C0FZZA1(MTK) 7pf 2013-Feb.pdf 0 01-08-2016 14:58 MT6737/MT6737/ 0 01-08-2016 14:58 MT6737/MT6737/Design Notice/ 5244555 01-08-2016 14:58 MT6737/MT6737/Design Notice/MT6737 PCB Design Guidelines-English-V0_1.pdf 913452 01-08-2016 14:58 MT6737/MT6737/Design Notice/MT6737x_Design_Notice_V0.1.pdf 0 01-08-2016 14:58 MT6737/MT6737/Reference Design/ 32160459 01-08-2016 14:58 MT6737/MT6737/Reference Design/MT6737_MMD-V0_1.zip 4911730 01-08-2016 14:58 MT6737/MT6737/Reference Design/MT6737x RF PHASE-2 REF_SCH_V0.1.rar 1805264 01-08-2016 14:58 MT6737/MT6737/Reference Design/MT6737x_MT6328_MT6169_MT6158_MT6625L_DISCRETE_EMMC_LPDDR3_GT_CHINA_PHASE-2_TSX_REF_SCH_V0.1.rar 1805148 01-08-2016 14:58 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