These are the JTAG connection points I traced from the CPU to their test points. i'm almost 90% sure the Primary is still usable. Auxilary JTAG port is Very very hard to get too and i'd imagine even for the technicians that reprogram them at the repair center. I didnt have much luck getting a connection made due to mu lack of JTAG knowledge and incorrect type of JTAG circuit(working on another though). i'm posting up the complete testpoints I spent MANY MANY countless hours and sleepless nights tracing so someone who has done this before can get a recovery procedure made to fix all bricked HTC-dreams. The reason I am doing all of this is not specifically for the Dream but because in the field of work im in, and the type of work I do I could benefit from it both for my personal phones and at work. I did research over the years but could never quite understand how JTAG is used until now. I took my spare fully working beater G1 and unsoldered the CPU with an IR Rework Station(T-870A) at home with the intentions of placing the CPU back on when done. took ALOT longer than I hoped and because of the fact that i had to hold test probes on the contact pads tight so I could flip the board and trace their also, it killed a couple of the pads so thats when I decided to say screw it, still have all the spares for my main Dream, now I can REALLY find the rest of the pins....and a few extras that might be used in the future to add features.
Their are 4 Mode control pins listed in the pictures.
Mode 3 is under the SIM slot, accessing requires de-soldering 4 points holding the SIM carrier to the board.
Mode 0 is NOT a testpoint, but a solder point were a resistor could go to ground. it is VERY hard to solder too directly.
Watchdog pin can simply be grounded with a resistor in place or with a needle through the shielding which would be ground. its a single solder point.
Primary JTAG is next to the LCD connector.
When you see were the pins for AUX are located you will see why I think thats not were the focus should be...their scattered in odd places, also have to remove the sim slot to access the last one which took forever to find.
Trackball has a hidden test point for the return clock as well, otherwise you need to solder directly to the connector on the main board.
Note: Return Clock is missing in the Picture for the AUX_JTAG connector...it is located at the top right testpoint just above the trackball pad, otherwise you will need to solder directly to the connector on main board.
if you need any more just let me know, if anyone wants to add to this please feel free.
Images are NOT MINE, they are the property of whomever took them, I only traced and added the labels, if their is a problem with using them let me know!
IF anyone wants to donate a bricked G1 board for experimenting or donate in general please feel welcome! [email protected] [email protected]