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!)
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Backside with foil still on it (this side is facing the front of the device)
Backside without Foil and here are the JTAG testpins:
The Pins I traced:
RTCK
TDO
TDI
TCK
TMS
TRST-N
*other pins:
Mode 0 (between TRST-N and TDI)
Will be checking for other pins on request (btw: sofar watchdog, mode 1,2,3 are not (yet) found)
These should suffice to JTAG the device.
For those in need of testpoints for reference voltage etc..:
Other info:
Memory module (on this board):
Hynix H8BES0UQ0MCA
More info Regarding JTAG as being used to debrick HTC Dream
Regards,
EqX
Great work equinoxe!!
orb3000 said:
Great work equinoxe!!
Click to expand...
Click to collapse
Well thanks for the board in the first place, without it I wouldn't be able to trace the pins!
Regards,
EqX
Sounds interesting, could you explain what this could be used for?
12
one use for JTAG is to flash the device at a low level (i.e. lower than the bootloader) - one use for this method of flashing is that you can recover from a bad bootloader flash
There are plenty of other uses too, that's just one
Kewl! I didn't know that
Very informative
Very good work, the first step to a device picking up momentum in a modding community is to find the JTAG pins, nice!
is this something awesomely awesome?
i mean does it enable us to do something cool which we couldnt do before?
You can eg. repair a hardbricked device.
Since you are entering the device on a lower level than the bootloader.
Lots of possibilities.
EqX
so, could this be used to enable iSecretary to work as a genuine answeringmachine? To send audio directly and not through speaker? And record incomming, ofcourse.
Goog work man !
can you make a high resolution picture to me?, i need to see all the CIs, to help in android development?, to see the diferences of decoders and encoders from the other devices.
@ Maikeu:
Regards,
EqX
Sounds interesting
To use the JTAG, you need some equipment, it does not connect to a PC's USB or serial port. And you need knowledge and software to delete everything in flash and reprogram stuff like a bootloader, radio or ROM.
I think this information is very usefull for some Topaz cracks, but not very usefull for most users.
My proposal to the moderator: Unstick this thread and put a link for it into the [ROLLUP MUST READ]ROM resources: HardSPL, Unlocking, Custom RUU, Kitchens, Radios thread, that's where it belongs.
can I ask for assistance in disassembling the td2 or could someone point me in the direction of a how to on the AT&T pure. I'm stuck getting the outer case of the back since the battery door is different than the original touch diamond 2. Thank you
does that look like an external antenna connector I see on the main board?
dna24 said:
can I ask for assistance in disassembling the td2 or could someone point me in the direction of a how to on the AT&T pure. I'm stuck getting the outer case of the back since the battery door is different than the original touch diamond 2. Thank you
Click to expand...
Click to collapse
Remove the plastic piece on the front (it is attached with only some double sided tape), beneath the plastic you can see the screws.
accord91lx said:
does that look like an external antenna connector I see on the main board?
Click to expand...
Click to collapse
Yes, there are 3 external connectors but tmk not accessible without disassembly.
@the-equinoxe----thank you so much, that worked perfectly, you da man
Related
Hi. I have some wallaby for repair from my team-mate, and i found, that soomeone (he told that serviceman ) "killed" some circuitry. That part is here:
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I cannot provide better image, coz i dont have camera with macro focusing, bud the area is clearly recognizable.
Would ANYONE be that kind, that he will tell me, what type of transistor and the other component (my guess is capacitor, but writing is unreadable EDIT: its Resistor R831 and it pulls down closer blue-marked IC to the ground, so i need a value of it ) it is? Both are "missing" so i cannot resolder them back. (marked with red)
Also some components are slightly damaged (like a scratch or something like that), but they are in place. (marked with blue)
The other possibility is that someone will send me service manual for this device. I'll be very glad for that (atleast this particular area).
This device turns on while in bootloader, and it turns on normally, but when it is not in bootloader, screen and backlight is dead, but i can hear windows boot sound, and it also reacts when i insert unformatted memcard, so i guess that OS is alive. I've passed all tests in test mode (except that in battery test there is known 0x000 problem in external voltage and charge voltage, but its charging, so no need to worry) and and i've tried to reflash it with new firmware (incl. bootloader) but no luck. I think that this (broken circuitry) is the case... Thanks in advance, Andy.
Hm, so many viewers, but noone replies... does anyone knows it? I have somehow managed to get the wallaby working, but i'd like to have it fixed correctly. so please... Someone... THX
the resistor is 240kOhms in my case. The smd transistor is marked with XA, don't know anything else
Thats exactly what i need So its the same transistor as others, so then it will be enough to measure its characteristics and buy similar THANK you !
BTW: did you unsolder that resistor from PCB, right? Didn't you measured it while connected, right? or was it written on its casing? if so, what exactly was on that ? (just to be sure)
i did not unsolder it. But in case 240kOhms is wrong the resistor must be even bigger than that (which is quite useless i guess)
No sound from speaker, low sound from earphone
Hi!
I copied my reply form another topic here:
I haven't got sound on my XDA1. I'm sure, that something died on the main board. When I run the audio test from the diagnostics. I can hear som very-very low sound, but only with earphones. This effect says me, that some amplifier gone bad.
I opened the case, and found a burned chip. I thought, I found the problem. I changed the chip, but nothing changed . (I have a "donor" main bard.)
By the way: what kind of chip is that? (See: attached image!)
On the chip is written "22 TI AHR", or "22 T1 AHR", or "22 TI AMR". Not good readable.
szajmon
Handy hint for you if you don't have a hi megapixel camera use a flatbed scanner you will get a much better detail picture allso handy for yourself to see reg details if you can't make them out.
just be gentle placing board on scanner plate.
Hi there, i need to know if is there a way to force the audio output by the headphone jack. I'm having problems with the headphone detection and they are constantly self-switching between them and the loudspeaker. It's not a software problem, i've tested many roms and the problem is always present .
Thanks!
Then it maybe a hardware problem. did you check it with the se center?
Cleaning and checking the port might get you something.
OR wait for someone else to post their ideas
Tim
I've tried several things with the connector, clean up, re-solder... but still having the problem. I'm sure that the audio output is working, but the detection is failing, so if i could simulate or force the detection of the headphones even without the headphones plugged, making the audio output going trough the audio jack i will be able to make more tests or even solve the problem the cheaper way. I,ve bring the phone to the service center and they say that is impossible for them to repair it.
Any idea?
Thanks!
YESSSS I've solved it! after getting the electronics schematics of the phone, I recognized the plug detection part of the circuit. after that, I've tested all the components in that circuit to discard a processor failure. I've founded a resistance broken. It was under a protection of solid paste cover, so I've got to remove it forcing it mechanicaly. After that I getted a new one and invented a way to solder it by putting the resistance in a more accesible place and wiring to the PCB points.
Anyway, I think that an app to force the audio output without the real presence of the headphones could be useful...
Tomorrow I'll post a photo of the repair.
Thanks, that'd be very nice of you! I for one am very interested in how you repaired it.
OK, here are the images...
The schematics were downloaded from here:http://www.cpkb.org/wiki/Sony_Ericsson_E10i_Xperia_X10_mini_service_manual. There are many service manuals from all brands.
The first image is the schematic of the PCB. X3600 is the 7pin 3.5 Jack. It has 11 soldering points, 4 of them are between the jack and the PCB and the soldering method is by BGA station due this. But, that 4 soldering points are those extra pins for the remote control. They are not indispensable.
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The second image is the electronics schematic. Is only the part of the jack connector. You can see a circuit starting in the pin nº4 that is named PLUG DETECT, so here is where we have to look. Its simple, it start in the 4pin, goes trough 2 resistors (R3601 33Kohms, R3600 200Kohms) and reach the N1500, wich is the qualcomm processor. Knwowing that, I've tested those resistors, and identifyed the ons failling, that is marked on the first image.
I've removed the broken resistor, and picked a new one from an old CD Reader. Here you have a page that shows how to read SMD resistors
http://www.dinastiasoft.com.ar/Tecnologia/Resistencias.htm Anyway, after founding the resistor, I've checked it with the multimeter. The value of the resistor needed was on the schematics and was 33Kohms.
The problem here was that the new resistor was bigger than the old one, so I have to make a way to solder it. I've solved it by picking a flat cable from the same CD reader and cutting it to have only 2 wires. After that, I've soldered the resistor on one end, and the wired resistor to the PCB points. Added some insulating tape, to avoid any undisired contact with other component or the test points below.
After all that, I've turned on the phone and YES! it worked perfectly!
My X10 was back!
Wow! Nice work, dude!
And very interesting website, thanks.
There is a now an app to fix it. toggleheadset2. It worked for my xperia mini pro.
My friend broke the screen on his Galaxy SII (i9100) during summer vacation. We ordered a screen&bezel replacement part from eBay, and have succesfully disassembled the phone, removed everything that needs to be removed (the new bezel is kind of an empty one, so I have to move just about all the easily removable parts from the old one). I've moved all parts except the PBA and sub-PBA (usb board) to the replacement part.
Pic:
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Now, the problem here seems to be that in the original part, where the USB board goes, there's this golden thingy underneath:
Which you can see is missing from the replacement part:
Since there's clearly a connection for that golden bar (pic: http://i47.tinypic.com/166gaqc.jpg ) underneath the usb board, I am fairly certain the phone won't work as intended if I just screw the board onto the replacement part as it is.
I'm also wondering about the small cable popping up from underneath the casing - is it supposed to just press down against the gray/silverish area when you screw the board onto the part or is there a connector for it to press against, maybe a part of the golden bar/thingy that's on the original part but not on the replacement? The cable's clearly visible in the first picture.
I've tried to search the web for videos, instructions, answers or any information about this, but can't seem to find anything to help with this one. If someone here is able to point me in the right direction or better yet, provide instructions for this, I'd really appreciate it!
Full size versions of the tagged pics:
[URL="http://i49.tinypic.com/3466l5f.jpg"]http://i49.tinypic.com/3466l5f.jpg[/URL]
[URL="http://i49.tinypic.com/28v3m20.jpg"]http://i49.tinypic.com/28v3m20.jpg[/URL]
[URL="http://i50.tinypic.com/29f2vs3.jpg"]http://i50.tinypic.com/29f2vs3.jpg[/URL]
this tutorial should answer all your questions
http://forum.xda-developers.com/showthread.php?t=1253969&highlight=tutorial+screen+replacement
Theres a good video that shows everything.Look at the motherboard topic I created (profile>view users topics)and a chap called Roger posted it.
Also you can download the service manual for the s2 off samsungs site and see what that gold bar is for.
Sent from my GT-N7000 using xda premium
Cosmic Blue: I've read and partially followed that tutorial, yes, but it's in no way helpful with this problem as the replacement part used in the tutorial has a new USB-board on it already and thus the guy doesn't even remove the USB-board at any point.
theunderling: Thanks for the tip, though I already watched that video as well - very helpful and clear indeed! Regardless, it doesn't help with the golden bar thing as the replacement part used in the video already has the golden bar on it. I also went through all the .pdf's in my service manual download, can't find a mention of the golden bar. Is it in there? If it is, where exactly?
I mean, what I really need to know here is if the golden bar is needed (99% sure the answer to this is yes) and how to move it from the old part to the new one that's missing the bar since I'm afraid to just go poking around and possibly break my friends phone. Also, the small cable that's sticking out - in the video it seems that the board is just installed on top of it, leaving it pressed against something that after examining the old part seems like a small strip of silver-color metal right next to the golden bar. This strip is also missing from the replacement part which leads me to think it's an extension of the golden bar. Anyone have any experience with this particular bit of the hardware?
Anyone?
You should call the person who sold it to you. He may have given you a defective board by mistake. I have checked the internet and all videos I have seen have the gold bar as part the screen assembly.
Cosmic Blue said:
You should call the person who sold it to you. He may have given you a defective board by mistake. I have checked the internet and all videos I have seen have the gold bar as part the screen assembly.
Click to expand...
Click to collapse
Alright, will do and will report here after the issue is solved in case someone else will find the information useful.
Thanks!
Edited years later as I shamefully forgot to report back... Yeap, got a new board and it worked just fine. That was the culprit.
Hi there,
i have purchased a smashed screen i9100 from a well known auction site and have decided to rebuild the s2 just to learn and play with it.
i have also purchased a new back and middle frame so i will be remounted the mainboard and other stuff back into the new housing.
i have been following a youtube tutorial on the strip down. it looks very "easy" to do. however i notice there is a small circuit above the camera. i will try explain this the best i can as i don't have any pictures just yet.
know if you remove the back cover which houses the battery, simcard and micro sd card, you may notice above the the rectangle camera and flash protector that there is a sticky circuit. this is what i have seem to damaged when trying to replace it between the two. i would be grateful if anyone knows what it is and maybe i am pushing it, but i would be even more grateful if anybody knows where i can purchase it from.
by looking at the circuit and following it around, it looks like some sort of antenna. i am no electrical/electronics expert (i'm a mechanical engineer by profession and enjoy learning about new things). it seems when you split the two cases with a case opener you will notice a small tab on the other side which is connects onto the mainboard.
so again, i would be grateful if the xda people can help me.
i've torn the circuit when trying to transfer.
if people require, i will try post some pictures
Thanks XDA members!
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Picture obtained from frazpc
Search my posts from the last week or so, I attached the service manuals in a zip to one of them.
Have a look at this thread...
http://forum.xda-developers.com/showthread.php?t=2241735
There is a very clear, detailed video tutorial for a COMPLETE strip down and re assembly of an S2. The guy even tells you what the parts/boards are as he removes them. Once you've found out what the part is called, a good place to look for it would be eBay......
Sent from my Rooted, De bloated Stock JB powered S2 via PhilZ kernel and Tapatalk 2....
GPS Antenna
MistahBungle said:
Search my posts from the last week or so, I attached the service manuals in a zip to one of them.
Click to expand...
Click to collapse
LOL thanks, errm i checked your previous post. i went back as far as 4th may. seems you help people out a lot
sadly i could not find the post you are on about. however i did search if i could obtain "service manuals" for the i9100. i seem to have obtained on.
keithross39 said:
Have a look at this thread...
http://forum.xda-developers.com/showthread.php?t=2241735
There is a very clear, detailed video tutorial for a COMPLETE strip down and re assembly of an S2. The guy even tells you what the parts/boards are as he removes them. Once you've found out what the part is called, a good place to look for it would be eBay......
Sent from my Rooted, De bloated Stock JB powered S2 via PhilZ kernel and Tapatalk 2....
Click to expand...
Click to collapse
you have sent a link to the youtube video i use.
Thanks for your help.
the video does not explain the part that i am on about. however he does put a link in the description about poor antenna issues etc etc.
With this i can show you what i mean now a bit better. the person has posted this photo of "antennas"
according to that i am on about gps antenna.
it loops onto the back as a sticker above the housing/protector of the camera and flash. it is the tape thing you see in the first picture i have attached.
i have been using that site (orignal comment about a well known auction site) but i try not to advertise in forums. however if you do find a link for this part, your help would be appreciated.
i personally don't advertise, but i don't mind people doing it i don't "force" people. every person has their own beliefs.
anyways, i would love it if somebody on here can sort me out with this gps antenna issue i face now after i ripped it while transferring into its new housing
Thanks to everyone once again
Hello,
I replaced my Sony Xperia Z5C lcd screen and everything is functioning well, except my wifi reception is poorer. Much poorer. I know it's a hardware problem because I've factory reset my phone and the problem persists.
I want to replace the wifi antenna, but shockingly, I cannot find any information about where it is. Is it a separate part? Is it on the motherboard? Some websites are telling me its a long thin blue wire. Some websites are telling me the plastic bracket is the wifi module. And some websites are telling me it is the NFC antenna. What I know to be true is that the antenna is located somewhere here, as described by the manual
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After researching to no conclusion, I am hoping that someone out there knows where it is located so I can replace it and get my phone working again. Thanks
Where it is at is not gonna be your issue. That will be that Sony doesn't sell replacement parts and you have have to solder it to the board and then reprogram it with tools not available to the public.
You should be able to pick it out when you opened it up. Also the screen could easily be part of the issue or you happened to touch something inside the device. That is the most common issue as the oils from human hands are terrible for electronic devices.
I would advise you to take it pack apart. With rubber gloves and an anti static pad. (should already have these from the screen repair.)
zelendel said:
Where it is at is not gonna be your issue. That will be that Sony doesn't sell replacement parts and you have have to solder it to the board and then reprogram it with tools not available to the public.
You should be able to pick it out when you opened it up. Also the screen could easily be part of the issue or you happened to touch something inside the device. That is the most common issue as the oils from human hands are terrible for electronic devices.
I would advise you to take it pack apart. With rubber gloves and an anti static pad. (should already have these from the screen repair.)
Click to expand...
Click to collapse
It is not the new screen. I tried putting back the old screen and it is still poor.
Can you please be more specific with how to fix the wifi antenna. Also, do you know where it is? It seems like you do. I just need more details about where it is.
flopshots said:
It is not the new screen. I tried putting back the old screen and it is still poor.
Can you please be more specific with how to fix the wifi antenna. Also, do you know where it is? It seems like you do. I just need more details about where it is.
Click to expand...
Click to collapse
I would have to see the device to be sure as it is placed differently in every model.
Then that leads me to the oil theory.
Once again finding it is the easy part.
So here is what you will need to do once you find it. (check fcc site. The approval comes with a blueprint.)
1. Take the whole device apart.
2. Remove the antenna
3. Replace the antenna by resold Erin it to the board.
4. Reprogram the board for the new antenna. (this you can't do as the software needed is not given to the public)
5. Use a J tag and the devices mount points on the board to reprogram the OS onto the board.
According to my own research, the antenna is right in that area where the manual states. It is a area on the plastic frame coated with conducting material in a certain pattern. If You remove that frame (right after you opened the backcover), You'll see many such coated areas which connect with the proper motherboard's spring contacts. Some of them to me seem to be only bridges from one mtherboard part to another, other coated areas seem to be antennas and such.