orb3000 · Apr 25, 2010 at 10:30 am

HTC Topaz JTAG pinouts

Before today JTAG (Joint Test Action Group) pinouts for Topaz were completely unknown, but today the-equinoxe was able to discover them. This is a serial bus with four signals: Test Clock (TCK), Test Mode Select (TMS), Test Data Input (TDI), and Test Data Output (TDO). The bus is used as a test bus for the ‘Boundary-Scan’ of ICs, as in Design-For-Testability.

Originally posted by the-equinoxe
I purchased a drowned HTC Diamond 2 which I used to house my MDA V in.
Now I was in possession of a broken mainboard.
Since the JTAG pinouts are unknown till this date, I stripped the mainboard from all its components and traced the board in order to find the JTAG.
Had to make new probes from some needles in order to trace from the BGA-Grid..
The difficulty here was that the test-pins where on the other side as where the MPM 7200-A was, and with those tiny bga-vias it was real hard to trace.

Some pictures of the board (before stripping)
The front side of the Mainboard (it is a single board device, apart from speakers, LCD and antenna no further external parts, all on one board!).
The Pins I traced:
RTCK
TDO
TDI
TCK
TMS
TRST-N

These should suffice to JTAG the device.

Continue to thread


_________
Want something on the XDA Portal? Send us a tip!

orb3000

orb3000 is an editor on XDA-Developers, the largest community for Android users. @orb3000 News Writer & Forum Moderator @xda-developers. Windows Phone/Android enthusiast, like HTC and flashing! 100% cert. free of i-products Xalapa, México View orb3000's posts and articles here.
Jimmy McGee · Jul 30, 2015 at 06:00 am · no comments

How to Root the LG G4 and Install TWRP Recovery – XDA TV

A rooting method has finally been found for the flagship LG G4. In this episode, XDA TV Producer TK shows you how to root and install TWRP recovery the LG G4. TK just recently reviewed the device.  So as is usual at XDA, we must root all the things, and the LG G4 is no exception! TK presents instructions on how to gain root access on your LG G4 using tools from the XDA Developers Forums. The process is painless...

XDA NEWS
Mario Tomás Serrafero · Jul 29, 2015 at 12:10 pm · 1 comment

OnePlus 2 vs Moto X Style: Which is The Better Flagship?

Two big industry names have announced their newest flagship phones within the past few days. Both have also promised great performance for a cheap price, and now that we know the specifications and details about both the Moto X Style and the OnePlus 2, we can begin planning our next purchase and debating which one is better. So, judging from everything we know, which phone is more impressive?

DISCUSS
Mathew Brack · Jul 29, 2015 at 10:35 am · 2 comments

Making Your Own Xposed Modules Is Easier Than You Think

Close to the heart of XDA is the Xposed Framework by Rovo89. Most of us will have used it but you may feel that the module repository is missing something. We have the solution with several guides aimed at getting you started to build your own modules, something that may be daunting but can open an entire new field of development with a little time and effort.     Where better to start than at the beginning? Rovo89 has created a straight forward tutorial for getting started with development for Xposed....

XDA NEWS